Chen Xudong

Associate Professor

PhD, Massachusetts Institute of Technology; 2005
MEng, Zhejiang University; 2001
BEng, Zhejiang University; 1999
Office: #E4-06-04

 (65)65162297 Click here to Email

Professional Working Experience

Jan 2011- Present: Associate Professor, Dept. of ECE, NUS
Sep 2012- Jul 2013: Sabbatical leave at Stanford University
Sep 2005- Dec 2010: Assistant Professor, Dept. of ECE, NUS
Sep 2002- Jun 2005: Teaching Assistant, Dept. of EECS, MIT
Sep 2001- Jun 2005: Research Assistant, RLE, MIT		

Professional Activities

Editorial service:
IEEE Transactions on Microwave Theories and Technique:  Associate Editor (2015-2019); Guest Editor (2013-2014)

Service to conferences:
2007	Member of Technical Program Committee, Design, Automation and Test in Europe
2008	Member of Technical Program Committee, Design, Automation and Test in Europe
2008	Session Organizer, European Electromagnetics
2010	Session Organizer, Progress In Electromagnetics Research Symposium
2011	Session Organizer, Progress In Electromagnetics Research Symposium
2012	Session Organizer, Progress In Electromagnetics Research Symposium
2012	Member of Technical Program Committee, IEEE TENCON
2013	Chair of Technical Program Committee, IEEE MTT-S IMWS on Bio
2014	Member of Organizing Committee, International Conference on Inverse Problems
2014	Member of Technical Program Committee, IEEE MTT-S IMWS on Bio
2014	Member of Technical Program Committee, Progress In Electromagnetics Research Symposium
2015	Session Organizer, International Conference on Computational Physics
2015	Member of Technical Program Committee, IEEE Asia-Pacific Conference on Synthetic Aperture Radar
2015	Co-Chair of Subcommittee in TPC, Progress In Electromagnetics Research Symposium
2015	Co-Chair of Technical Program Committee, IEEE Asia-Pacific Conference on Antennas and Propagation
2015	Chair of Award Committee, IEEE MTT-S IMWS on AMP
2015	Member of TPC and Member of IAC, IEEE MTT-S IMWS on Bio
2016	Co-Chair of Subcommittee in TPC, Progress In Electromagnetics Research Symposium
2016	Member of Technical Program Committee, IEEE Asia-Pacific Conference on Antennas and Propagation
2016	Member of Organizing Committee, International Conference on Inverse Problems
2016	Member of Technical Program Committee, IEEE MTT-S IMWS on AMP
2017	Chair of Award Committee, International Applied Computational Electromagnetics Society Symposium

Research Interest

 Inverse scattering problems (and related imaging)
 Electromagnetic wave theory and applications
 Non-destructive evaluation 
 Scanning microscopy (modeling for various modalities)
 Optical encryption

Selected Publications

Book:
X. Chen, Numerical Methods for Electromagnetic Inverse Scattering, Wiley, 2017

Journal Papers:

Year 2017:
Z, Wei, W. Chen, C. Qiu, X. Chen, "Conjugate gradient method for Phase retrieval based on Wirtinger derivative," Journal of the Optical Society of 
America, A, Accepted, 2017

M. Wu, et. al.,  "Creation of longitudinally polarized photonic nanojet via engineered microsphere, " Optics Letters, Accepted,  2017


Year 2016:
Z. Wei, R. Chen, H. Zhao and X. Chen, "Two FFT Subspace-Based Optimization Methods for Electrical Impedance Tomography", Progress in Electromagnetic 
Research, Vol. 157, pp. 111–120, 2016

R. Chen, M. X. Wu, J. Lin, Z. Wei, Z. C. Chen, M. H. Hong and X. Chen, "Superresolution microscopy imaging using full wave modelling and inverse 
reconstruction," Optica, Vol. 3, pp. 1339-1347, 2016

C. J. R. Sheppard, S. Roth, R. Heintzmann, M. Castello, G. Vicidomini1, R. Chen, X.  Chen, and A. Diaspro, "Interpretation of the optical transfer 
function: Significance for image scanning microscopy," Optics Express, Vol. 24, pp. 27280-27287, 2016

B. Javidi, et. al., "Roadmap on optical security," Journal of Optics, Vo. 18, ID: 083001 (39pp), 2016.

Z. Wei, Y. Cui, E. Ma, S. Johnston, Y. Yang, K. Agarwal, M. Kelly, Z-X Shen, and X. Chen, "Quantitative analysis of effective height of probes in 
microwave impedance microscopy," Review of Scientific Instruments, Vol. 87, ID: 094701 (6 pages), 2016. 

W. Chen and X. Chen, "Digital holography-secured scheme using only binary phase or amplitude as ciphertext," Applied Optics, Vol. 55, pp. 6740-
6746, 2016

M. Wu, R. Chen, J. Soh, Y. Shen, L. Jiao, J. Wu, X. Chen, R. Ji, and M. Hong, "Super-focusing of center-covered engineered microsphere," Scientific 
Reports,  Vol. 6, ID: 31637 (7 pages), 2016

Z. Wei, Y. Cui, E. Ma, S. Johnston, Y. Yang, R. Chen, M. Kelly, Z-X Shen, and X. Chen, "Quantitative Theory for Probe-Sample Interaction with 
Inhomogeneous Perturbation in Near-Field Scanning Microwave Microscopy", IEEE Transactions on Microwave Theory and Techniques, Vol. 64, pp. 1402-
1408, 2016

Y. Zhong, M. Lambert, D. Lesselier, and X. Chen, "A new integral equation method to solve highly nonlinear inverse scattering problems", IEEE 
Trans. on Antennas and Propagation, Vol. 64, pp. 1788-1799, 2016  
 
L. Chen, B. He, X. Chen, X. Gao and J. Liu, "Optical image encryption based on multi-beam interference and common vector decomposition", Optics 
Communications, Vol. 361, pp. 6-12, 2016

L. Chen, X. Gao, X. Chen, B. He, J. Liu, and D. Li, "A New Optical Image Cryptosystem Based on Two-Beam Coherent Superposition and Unequal Modulus 
Decomposition, " Optics and Laser Technology, Vol. 78, Part B, pp. 167–174, 2016 
 


Year 2015:
X. Ye, L. Poli, G. Oliveri, Y. Zhong, K. Agarwal, A. Massa, and X. Chen, "Multi-resolution subspace-based optimization method for solving three-
dimensional inverse scattering problems", Journal of the Optical Society of America, A, Vol. 32, pp. 2218-2226, 2015

M. X. Wu, B. J. Huang, R. Chen, Y. Yang, J. F. Wu, R. Ji, X. Chen, and M. H. Hong, "Modulation of Photonic Nanojets generated by Microspheres 
decorated with Concentric Rings, " Optics Express, Vol. 23, pp. 20096-20103, 2015,	

K. Agarwal, R. Chen, L. S. Koh, C. J. R. Sheppard, and X. Chen, "Crossing the Resolution Limit in Near-Infrared Imaging of Silicon Chips: Targeting 
10-nm Node Technology", Physical Review, X, Vol. 5, ID: 021014 (9pp), 2015

W. Chen and X. Chen, "Grayscale object authentication based on ghost imaging using binary signals," Europhysics Letters, 110, 44002 (5pp), 2015.

W. Chen and X. Chen, "Optical authentication via photon-synthesized ghost imaging using optical nonlinear correlation," Optics and Lasers in 
Engineering, 73, 123-127, 2015.

T. X. Hoang, Y. Duan, X. Chen, and G. Barbastathis, "Focusing and imaging in microsphere-based microscopy," Optics Express, Vol. 23, pp. 12337-
12353, 2015

X. Wang, W. Chen, and X. Chen, "Optical encryption and authentication based on phase retrieval and sparsity constraints," IEEE Photonics Journal, 
7, 7800310 (10pp), 2015.

X. Wang, W. Chen, and X. Chen, "Optical information authentication using compressed double-random-phase-encoded images and quick-response codes," 
Optics Express, Vol. 23, pp. 6239-6253, 2015.

X. Wang, W. Chen, and X. Chen, "Optical image hiding using double-phase retrieval algorithm based on nonlinear cryptosystem under vortex beam 
illumination," Journal of Optics, Vol. 17, ID: 035704 (6pp), 2015.

W. Chen, X. Wang, and X. Chen, "Security-enhanced phase encryption assisted by nonlinear optical correlation via sparse phase," Journal of Optics, 
Vol. 17, ID. 035702 (12pp), 2015.

K. Xu, Y. Zhong, R. Song, X. Chen, and L. Ran, "Multiplicative-Regularized FFT Twofold Subspace-Based Optimization Method for Inverse Scattering 
Problems", IEEE Trans. Geoscience and Remote Sensing, Vol. 53, pp. 841-850, 2015

W. Chen and X. Chen, "Ghost imaging using labyrinth-like phase modulation patterns for high-efficiency and high-security optical encryption," 
Europhysics Letters, Vol. 109, ID. 14001 (5pp), 2015

R. Song, X. Ye, and X. Chen, "Reconstruction of scatterers with four different boundary conditions by T-matrix method, " Inverse Problems in 
Science and Engineering, Vol. 23, pp. 601-616, 2015


Year 2014:
Y. Zhong, P. P. Ding, M. Lambert, D. Lesselier, and X. Chen, "Fast calculation of scattering by 3-D inhomogeneities in uniaxial/biaxial 
multilayers", IEEE Trans. on Antennas and Propagation, Vol. 62, pp. 6365-6374, 2014

E. L. Loh, R. Chen, K. Agarwal, and X. Chen, "Feature based filter design for resolution  enhancement of known features in microscopy," Journal of 
the Optical Society of America, A, Vol. 31, pp. 2610-2617, 2014.

X. Wang, W. Chen and X. Chen, "Fractional Fourier domain optical image hiding using phase retrieval algorithm based on iterative nonlinear double 
random phase encoding", Opt. Express, Vol. 22, pp. 22981-22995, 2014.

X. Wang, W. Chen and X. Chen, "Optical binary image encryption using aperture-key and dual wavelengths", Opt. Express, Vol. 22, pp. 28077-28085, 
2014

W. Chen and X. Chen, "Arbitrarily modulated beam for phase-only optical encryption," Journal of Optics, Vol. 16, 105402 (10pp), 2014.

X. Ye, R. Song, and X. Chen, "Application of T-matrix method in solving mixed boundary separable obstacle problem," Opt. Express, Vol. 22, pp. 
16273-16281, 2014.

W. Chen and X. Chen, "Optical color-image verification using multiple-pinhole phase retrieval," Journal of Optics, Vol. 16, 075403 (12pp), 2014.

W. Chen and X. Chen, "Iterative phase retrieval for simultaneously generating two phase-only masks with silhouette removal in interference-based 
optical encryption," Optics Communications, Vol. 331, pp. 133-138, 2014.

W. Chen and X. Chen, "Marked ghost imaging," Applied Physics Letters, Vol. 104, 251109 (5pp), 2014.

W. Chen, B. Javidi, and X. Chen, "Advances in optical security systems," Advances in Optics and Photonics, Vol. 6, pp. 120-155, 2014.

T. X. Hoang, X. Chen, and C. J. R. Sheppard, "Multipole and plane wave expansions of diverging and converging fields," Optics Express, Vol. 22, pp. 
8949-8961, 2014

Y. Kiasat, Z. Szabo, X. Chen, and E. Li, "Light interaction with multilayer arbitrary  anisotropic structure: an explicit analytical solution and 
application for sub- wavelength imaging", Journal of the Optical Society of America, B, Vol. 31, pp. 648-655, 2014

W. Chen and X. Chen, "Optical multiple-image authentication based on modified Gerchberg-Saxton algorithm with random sampling", Optics 
Communications, Vol. 318, pp. 128-132, 2014

W. Chen and X. Chen, "Double random phase encoding using phase reservation and compression", Journal of Optics, Vol. 16, pp. 025402 (7pp), 2014

Y. Zhong, M. Lambert, D. Lesselier, and X. Chen, "Electromagnetic response of anisotropic laminates to interior or exterior sources", IEEE Trans. 
on Antennas and Propagation, Vol. 62, pp. 247-256, 2014


Year 2013:
W. Chen and X. Chen, "Ghost imaging for three-dimensional optical security," Applied Physics Letters, Vol. 103, pp. 221106 (4pp), 2013.

W. Chen, G. Situ, and X. Chen, "High-flexibility optical encryption via aperture movement", Optics Express, Vol. 21, pp. 24680-24691, 2013

T. X. Hoang, X. Chen and C. Sheppard, "Rigorous analytical modeling of high-aperture focusing through a spherical interface", Journal of the 
Optical Society of America, A, Vol. 30, pp. 1426-40, 2013

R. Chen, K. Agarwal, C. J. R. Sheppard, and X. Chen, "Imaging using cylindrical vector beams in a high numerical aperture microscopy system", 
Optics Letters, Vol.38, pp. 3111-3114, 2013

X. Ye, X. Chen, Y. Zhong, and R. Song, "Simultaneous reconstruction of dielectric and perfectly conducting scatterers via T-matrix method", IEEE 
Trans. on Antennas and Propagation, Vol. 61, pp. 3774-81, 2013

J. Shen, Y. Zhong, X. Chen, and L Ran, "Inverse scattering problems of reconstructing perfectly electric conductors with TE illumination", IEEE 
Trans. on Antennas and Propagation, Vol. 61, pp. 4713-4721, 2013

R. Chen, K. Agarwal, C. J. R. Sheppard, J. C. H. Phang, and X. Chen, "A complete and computationally efficient numerical model of aplanatic solid 
immersion lens scanning  microscope", Opt. Express, Vol. 21, pp. 14316-14330, 2013

W. Chen and X. Chen, A. Stern and B. Javidi, "Phase-Modulated Optical System with Sparse Representation for Information Encoding and 
Authentication", IEEE Photonics Journal, Vol. 5, 6900113 (13pp), 2013

W. Chen and X. Chen, A. Anand, and B. Javidi, "Optical encryption using multiple intensity samplings in the axial domain", Journal of the Optical 
Society of America, A, Vol. 30, pp. 806-812, 2013

W. Chen and X. Chen, "Object authentication in computational ghost imaging with the realizations less than 5% of Nyquist limit", Optics Letters, 
Vol. 38, pp. 546-548, 2013

W. Chen and X. Chen, "Optical cryptography network topology based on 2D-to-3D conversion and phase-mask extraction", Optics and Lasers in 
Engineering, Vol. 51, pp. 410-416, 2013

K. Agarwal, R. Song, M. D'Urso, and X. Chen, "Improving the Performances of the Contrast Source Extended Born Inversion Method by Subspace 
Techniques", IEEE Geoscience and Remote Sensing Letters, Vol. 10, pp. 391-395, 2013

W. Chen and X. Chen, "Optical image encryption based on multiple-region plaintext and  phase retrieval in three-dimensional space", Optics and 
Lasers in Engineering, Vol. 51, pp. 128-133, 2013

W. Chen and X. Chen, "Security-enhanced interference-based optical image encryption", Optics Communications, Vol. 286, pp. 123-129, 2013


Year 2012:
L. Pan, X. Chen, and S. P. Yeo, "A Compressive-sensing-based Phaseless Imaging Method for Point-like Dielectric Objects", IEEE Trans. on Antennas 
and Propagation, Vol. 60, pp. 5472-5, 2012 

R. Chen, K. Agarwal, Y. Zhong, C. J. R. Sheppard, J. C. H. Phang, and X. Chen, "Complete modeling of sub-surface microscopy system based on 
aplanatic solid immersion lens", Journal of the Optical Society of America, A, Vol. 29, pp. 2350-9, 2012

T. X. Hoang, X. Chen and C. Sheppard, "Interpretation of the scattering mechanism for particles in a focused beam", Physical Review A,  Vol. 86, 
ID: 033817 (6 pp), 2012

R. Song, and Y. Zhong, and X. Chen, "A multi-dimensional sampling method for locating small scatterers", Inverse Problems, Vol. 28, ID: 115004 
(15pp), 2012

R. Song, and X. Chen, and Y. Zhong, "Imaging small three-dimensional elastic inclusions by enhanced multiple signal classification method", Journal 
of the Acoustical Society of America, Vol. 132, pp. 2420-2426, 2012

R. Song, R. Chen, and X. Chen, "Imaging three-dimensional anisotropic scatterers in multi-layered medium by MUSIC method with enhanced resolution", 
Journal of the Optical Society of America, A, Vol. 29, pp. 1900-1905, 2012

W. Chen, X. Chen, "Interference-based optical image encryption using three-dimensional phase retrieval", Applied Optics, Vol. 51, pp. 6076-83, 2012

R. Song and X. Chen, "Analysis of cutoff wavelength of  elliptical waveguide by regularized meshless method", International Journal of Numerical 
Modelling: Electronic Networks, Devices and Fields, Vol. 25, pp. 417-427, 2012

W. Chen, X. Chen and C. Sheppard, "Optical image encryption based on phase retrieval combined with three-dimensional particle-like distribution", 
Journal of Optics, ID: 075402 (9pp), 2012

R. Chen, K. Agarwal, C. J. R. Sheppard, J. C. H. Phang, and X. Chen, "Resolution of aplanatic solid immersion lens based microscopy", Journal of 
the Optical Society of America, A, Vol. 29, pp. 1059-70, 2012

W. Chen and X. Chen, "Focal plane detection and object reconstruction in the noninterferometric phase imaging", Journal of the Optical Society of 
America, A, Vol. 29, pp. 585-592, 2012

K. Agarwal, L. Pan, Y. K. Leong, M. Han, O. Y. Chan, X. Chen and S. P. Yeo, "Practical Applications of Multiple Signal Classification", 
International Journal of RF and Microwave Computer-Aided Engineering, Vol. 22, pp. 359-369, 2012

W. Chen and X. Chen, "Structured-illumination-based lensless diffractive imaging and its application to optical image encryption", Optics 
Communications, Vol. 285, pp. 2044-7, 2012

W. Chen, X. Chen and C. Sheppard, "Optical color-image encryption and synthesis using coherent diffractive imaging in the Fresnel domain", Opt. 
Express, Vol. 20, pp. 3853-65, 2012

X. Ye, R. Song, K. Agarwal, and X. Chen, "Electromagnetic imaging of separable obstacle", Opt. Express, Vol. 20, pp. 2206-19, 2012

W. Chen, X. Chen and C. Sheppard, "Optical image encryption based on coherent diffractive imaging using multiple wavelengths", Optics 
Communications, Vol. 285, pp. 225-228, 2012

T. X. Hoang, X. Chen and C. Sheppard, "Multipole theory for tight focusing of polarized light, including radially polarized and other special 
cases", Journal of the Optical Society of America, A, Vol. 29, pp. 32-43, 2012


Year 2011:
X. Chen, "Implicit boundary conditions in transformation-optics cloaking for electromagnetic waves", Progress In Electromagnetics Research, Vol. 
121, pp.521-534, 2011

W. Chen and X. Chen, "Optical image encryption using multi-level Arnold transform and noninterferometric imaging", Optical Engineering, Vol. 50, 
ID: 117001 (5 pages), 2011

X. Chen and G. Uhlmann, "Cloaking a sensor for three-dimensional Maxwell’s equations: transformation optics approach", Opt. Express, Vol. 19, pp. 
20518-20530, 2011

W. Chen and X. Chen, "Optical multiple-image encryption based on multiplane phase retrieval and interference", Journal of Optics, Vol. 13, ID: 
115401 (8 pages), 2011

L. Hu, R. Chen, K. Agarwal, C. J. R. Sheppard, J. C. H. Phang, and X. Chen, "Dyadic Green’s function for aplanatic solid immersion lens based sub-
surface microscopy", Optics Express, Vol. 19, pp19280- 19295, 2011

W. Chen, X. Chen and C. Sheppard, "Optical double-image cryptography based on diffractive imaging with a laterally-translated phase grating", 
Applied Optics, Vol. 50, pp.5750-5757, 2011

G. Oliveri, Y. Zhong, X. Chen, and A. Massa, "Multi-Resolution Subspace-Based Optimization Method for Inverse Scattering Problems",  Journal of the 
Optical Society of America, A, Vol. 28, pp2057-69, 2011

K. Agarwal, X. Chen, L. Hu, H. Liu, and G. Uhlmann, "Polarization-Invariant Directional Cloaking by Transformation Optics", Progress In 
Electromagnetics Research, Vol. 118, 415-423, 2011

W. Chen and X. Chen, "Optical asymmetric cryptography using a three-dimensional space-based model",  Journal of Optics, Vol. 13, ID: 075404 (7pp), 
2011

W. Chen and X. Chen, "Optical cryptography topology based on a three-dimensional particle-like distribution and diffractive imaging", Optics 
Express, Vol. 19, pp. 9008-19, 2011

W. Chen and X. Chen, "Optical color image encryption based on an asymmetric cryptosystem in the Fresnel domain", Optics Communications, Vol. 284, 
pp. 3913-7, 2011

X. Ye, Y. Zhong, and X. Chen, "Reconstructing perfectly electric conductors by subspace-based optimization method with continuous variables", 
Inverse Problems, ID: 055011 (14pp), 2011

J. Shen, X. Chen, Y. Zhong, and L Ran, "Inverse Scattering Problem in Presence of a Conducting Cylinder", Optics Express, Vol. 19, pp. 10698-10706, 
2011

W. Chen and X. Chen, "Quantitative phase retrieval of complex-valued specimens based on a noninterferometric imaging", Applied Optics, Vol. 50, pp. 
2008-2015, 2011

K. M. Lim, G. C. F. Lee, C. J. R. Sheppard, J. C. H. Phang, C. L. Wong and X. Chen, "The Effect of Polarization on a Solid Immersion Lens of 
Arbitrary Thickness", Journal of the Optical Society of America, A, Vol. 28, pp. 903-911, 2011

L. Shen, X. Chen, X. Zhang, and K. Agarwal, "Guiding terahertz waves by a single row of periodic holes on a planar metal surface", Plasmonics, Vol. 
6, pp. 301-305, 2011

L. Pan, Y. Zhong, X. Chen, and S. P. Yeo, "Subspace-based optimization method for inverse scattering problems utilizing phaseless data", IEEE 
Transactions on Geoscience and Remote Sensing, Vol. 49. pp. 981-987, 2011

Y. Zhong and X. Chen, "An FFT Twofold Subspace-based Optimization Method for Solving Electromagnetic Inverse Scattering Problems", IEEE Trans. on 
Antennas and Propagation,  Vol. 59, pp. 914-927, 2011


Year 2010:
X. Chen, Y. Zhong, and K. Agarwal, "Subspace Methods for Solving Electromagnetic Inverse Scattering Problems", Methods and Applications of 
Analysis, Vol. 17, pp. 407-432, 2010

W. Chen and X. Chen, "Space-based optical image encryption", Optics Express, Vol. 18, pp. 27095-27104, 2010

W. Chen, X. Chen and C. Sheppard, "Optical image encryption based on diffractive imaging", Optics Letters,  Vol. 35, pp. 3817-9, 2010

L. Pan, X. Chen, Y. Zhong, and S. P. Yeo, "Comparison among the variants of the subspace-based optimization method for addressing inverse 
scattering problems: transverse electric case", Journal of the Optical Society of America, A, Vol. 27, pp. 2208-15, 2010

W. Chen and X. Chen, "Quantitative phase retrieval of a complex-valued object using variable function orders in the fractional Fourier domain", 
Optics Express, Vol. 18, pp. 13536- 41, 2010

X. Chen, "Subspace-based optimization method for inverse scattering problems with an inhomogeneous background medium", Inverse Problems, Vol. 26, 
ID: 074007, 2010

L. Shen, X. Chen, X. Zhang, and L. Pan, "Blue-shifted contra-directional coupling between a periodic and conventional dielectric waveguides", 
Optics Express,  Vol. 18, pp. 9341- 50, 2010

L. Pan, X. Chen, S. P. Yeo, "Nondestructive evaluation of nano-scale structures: inverse scattering approach", Applied Physics, A, Vol. 101, pp. 
143-146, 2010

Y. Zhong, X. Chen, and K. Agarwal, "An Improved Subspace-based Optimization Method and its Implementation in Solving Three-dimensional Inverse 
Problems", IEEE Transactions on Geoscience and Remote Sensing, Vol. 48 pp. 3763-8, 2010

T. Lu, K. Agarwal, Y. Zhong, and X. Chen, "Through-wall imaging: application of subspace-based optimization method",  Progress in Electromagnetic 
Research, Vol. 102, pp. 351-366, 2010

K. Agarwal, X. Chen and Y. Zhong, "A multipole-expansion based linear sampling method for solving inverse scattering problems", Optics Express, 
Vol. 18,  pp. 6366-81, 2010

X. Chen, "Multiple signal classification method for detecting point-like scatterers embedded in an inhomogeneous background medium", Journal of the 
Acoustical Society of America, Vol. 127, pp. 2392-2397, 2010.

X. Chen, "Subspace-based Optimization Method for Solving Inverse Scattering Problems", IEEE Transactions on Geoscience and Remote Sensing, Vol. 48, 
pp. 42-49, 2010.

X. Ye, X. Chen, Y. Zhong, and K. Agarwal, "Subspace-based optimization method for reconstructing perfectly electric conductors", Progress in 
Electromagnetic Research, Vol. 100, pp. 119-128, 2010.

X. Chen and Y. Zhong, "Influence of multiple scattering on the resolution in inverse scattering", Journal of the Optical Society of America, A, 
Vol. 27, pp. 245-250, 2010.

K. Agarwal, L. Pan and X. Chen, "Subspace-based optimization method for reconstruction of two-dimensional complex anisotropic dielectric objects", 
IEEE Trans. Microwave Theory and Technique, Vol. 58, pp. 1065-74, 2010.

K. Agarwal, L. Chen, N. Chen and X. Chen, "Multistage inversion algorithm for biological tissue imaging", Journal of Biomedical Optics, Vol. 15, 
ID: 016007, 2010


Year 2009:
X. Chen, "Subspace-based optimization method in electric impedance tomography", Journal of Electromagnetic Waves and Applications, Vol. 23, 
pp.1397-406, 2009.

L. Pan, K. Agarwal, Y. Zhong, S. P. Yeo, X. Chen, "Subspace-based optimization method for reconstructing extended scatterers: Transverse Electric 
case", Journal of the Optical Society of America, A, Vol. 26, pp. 1932-7, 2009.

Y. Zhong and X. Chen, "Twofold subspace-based optimization method for solving inverse scattering problems", Inverse Problems, Vol.25, ID: 085003 
(11 pages), 2009.

X. Chen, "Application of signal-subspace and optimization methods in reconstructing extended scatterers", Journal of the Optical Society of 
America,  A, Vol.26, pp.1022-6, 2009

X. Chen and Y. Zhong, "MUSIC electromagnetic imaging with enhanced resolution for small inclusions", Inverse Problems, Vol.25, ID:015008 (12pp), 
2009


Year 2008:
X. Chen and Y. Zhong, "Electromagnetic imaging of multiple-scattering small objects: Non-iterative analytical approach", Journal of Physics: 
Conference Series, Vol. 124, 012016 (12 pages), 2008

K. Agarwal and X. Chen, "Applicability of MUSIC-type Imaging in Two-Dimensional Electromagnetic Inverse Problems", IEEE Trans. on Antennas and 
Propagation, Vol. 56, pp.3217-23, 2008

X. Chen, "Signal-subspace method approach to intensity-only electromagnetic inverse scattering problem", Journal of the Optical Society of America, 
A, Vol. 25, pp. 2018-24, 2008

X. Chen and K. Agarwal, "MUSIC Algorithm for Two-dimensional Inverse Problems with Special Characteristics of Cylinders", IEEE Trans. on Antennas 
and Propagation, Vol. 56, pp. 1808-12, 2008

X. Chen, "MUSIC imaging applied to total internal reflection tomography", Journal of the Optical Society of America, A, Vol. 25, pp. 357-364, 2008

L. Shen, X. Chen, Y. Zhong, and K. Agarwal, "The effect of absorption on terahertz surface plasmon polaritons propagating along periodically 
corrugated metal wires", Physical Review B, Vol. 77, pp. 075408(1-7), 2008

L. Shen, X. Chen, and T. J. Yang, "Terahertz surface plasmon polaritons on periodically corrugated metal surfaces", Optics Express, Vol. 16, 
pp3326-33, 2008


Year 2007:
Y. Zhong and X. Chen, "MUSIC Imaging and Electromagnetic Inverse Scattering of Multiple-Scattering Small Anisotropic Spheres", IEEE Trans. on 
Antenna and Propagation, Vol. 55, pp3542-49, 2007

X. Chen and Y. Zhong, "A robust noniterative method for obtaining scattering strengths of multiply scattering point targets", Journal of the 
Acoustical Society of America, Vol. 122, pp1325-27, 2007

S. C. Kong, Z. M. Thomas, X. Chen, B.-I. Wu, TM Grzegorczyk, J. A. Kong, "Band-stop filter based on a substrate embedded with metamaterials", 
Microwave and Optical Technology Letters 49 (3), pp530-534, 2007

X. Chen, "Time-reversal operator for a small sphere in electromagnetic fields", Journal of Electromagnetic Waves and Applications, Vol. 21, pp1219-
30, 2007

X. Chen, Kevin O'Neill, Tomasz M. Grzegorczyk, and Jin Au Kong, "Spheroidal Mode Approach for the Characterization of Metallic Objects Using 
Electromagnetic Induction", IEEE Transactions on Geoscience and Remote Sensing, Vol. 45, No. 3, pp 697-706, 2007

X. Chen, "Comment on 'Analysis of the time-reversal operator for scatterers of finite size,' by D. H. Chambers [J. Acoust. Soc. Am. 112, 411-419 
(2002)]", Journal of the Acoustical Society of America, Vol. 121, No. 2, pp743-744, 2007


Year 2006:
T. Rao, X. Chen, "Analysis of the time-reversal operator for a single cylinder under two-dimensional settings", Journal of Electromagnetic Waves 
and Applications, Vol. 20 (15): pp2153-65, 2006

X. Chen, T. M. Grzegorczyk and J. A. Kong, "Optimization Approach to the Retrieval of the Constitutive Parameters of a Slab of General 
Bianisotropic Medium". Progress in Electromagnetic Research, Vol. 60, pp1-18, 2006

Y. Zhong, L. Shen, L. X. Ran, X Chen, L. Jylha, T. M. Grzegorczyk and J. A. Kong, "Reflection and refraction on the boundary of a left-handed 
material with a hyperbolic dispersion relation". Chinese Physics Letters, 23, no. 5, pp1296-8, 2006

B. Wu,  W. Z. Wang, J. Pacheco, X. Chen,  J. Lu, T. M. Grzegorczyk, J. A. Kong, P. Kao, P. A. Theophelakes and M. J. Hogan, "Anisotropic 
metamaterials as antenna substrate to enhance directivity". Microwave and Optical Technology Letters, 48, no. 4, pp680-683, 2006


Year 2005:
T. M. Grzegorczyk, C. Moss, J. Lu, X. Chen, J. Pacheco and J. A. Kong, "Properties of left-handed metamaterials: transmission, backward phase, 
negative refraction, and focusing ". IEEE Transactions on Microwave Theory and Techniques, 53, no. 9, pp2956-67, 2005

Z. Thomas, T. Grzegorczyk, B. Wu, X. Chen and J. A. Kong, "Design and Measurement of a Four-Port Device using Left-Handed Metamaterials". Optics 
Express, Vol. 13, no. 12, pp4737-44, 2005

X. Chen, B.-I. Wu, J. A. Kong, and T. M. Grzegorczyk, "Retrieval of the effective constitutive parameters of bianisotropic metamaterials", Physical 
Review E, vol. 71, pp046610, 2005.

T. M. Grzegorczyk, M. Nikku, X. Chen, B.-I. Wu, and J. A. Kong, "Refraction laws for anisotropic media and their application to left-handed 
metamaterials", IEEE Trans. on Microwave Theory and Techniques, vol. 53 (4), pp1443-50, 2005.

T. M. Grzegorczyk, X. Chen, J. Pacheco, J. Chen, B.-I. Wu, and J. A. Kong, "Reflection Coefficients and Goos-Hanchen Shifts in Anisotropic and 
Bianisotropic Left-Handed Metamaterials", Progress in Electromagnetic Research, vol. 51, pp83-113, 2005.

B.-I. Wu, W. Wang, J. Pacheco, X. Chen, T. Grzegorczyk, J. A. Kong, P. Kao, and M. Hogan, "A Study of Using Metamaterials as Antenna Substrate to 
Enhance Gain", Progress in Electromagnetic Research, vol. 51, page(s)295-328, 2005.


Year 2004 and before:
X. Chen, K. O'Neill, B. E. Barrowes, T. M. Grzegorczyk, and J. A. Kong, "Application of a spheroidal mode approach and differential evolution 
algorithm in inversion of magneto-quasistatic data for UXO discrimination", Inverse Problem, vol. 20, pp S27-S40, 2004.

B. E. Barrowes, K. O'Neill, T. M. Grzegorczyk, X. Chen, and J. A. Kong, "Broadband Analytical Magnetoquasistatic Electromagnetic Induction Solution 
for a Conducting and Permeable Spheroid", IEEE Trans. Geosci. Remote Sensing vol. 42 (11), pp 2479-89, 2004.

X. Chen, T. M. Grzegorczyk, B.-I. Wu, J. Pacheco, and J. A. Kong, "Robust method to retrieve the constitutive effective parameters of 
metamaterials", Physical Review E, vol. 70, pp 016608, 2004.

X. Chen, G. Ni, and S. Yang, "An improved TABU algorithm applied to global optimizations of inverse problems in electromagnetics", IEEE 
Transactions On Magnetics Vol. 38 (2): pp 1069-72, 2002. 

X. Chen, J. Qian, G. Ni, S. Yang, and M. Zhang, "An improved Genetic Algorithm for global optimization of electromagnetic problems", IEEE 
Transactions On Magnetics Vol. 37 (5), pp 3579-83, 2001.

G. Huang, X. Chen and W. Shao, "A Mathematical Model of the Design of Parameters of Parts", (in Chinese), Mathematics in  Practice and Theory, 
Vol.28, No.1, pp18-21, 1998.


Book Chapter:

K. Agarwal, X. Chen, and Y. Zhong, "Application of Differential Evolution to aTwo-Dimensional Inverse Scattering Problem", Differential Evolution 
in Electromagnetics (A. Qing and C.K. Lee Editors), Springer-Verlag Berlin Heidelberg, pp. 73-105, 2010

T. M. Grzegorczyk, L. Ran, X. Zhang, K. Chen, X. Chen, and J. A. Kong, "Two Dimensional Periodic Approach for the Study of Left-Handed 
Metamaterials", Wave Propagation, Scattering and Emission in Complex Media (Y.-Q. Jin Editor), World Scientific (Singapore) and Science Press 
(Beijing), pp 175-186, 2003. 

Teaching Courses

EE2011  Engineering Electromagnetics (2006-2016)
EE5302  Microwave Theory & Techniques (2006-2011)
EE5831R Electromagnetic Wave Theory (2012,2014,2015)
EE6004  Selected Advanced Topics in Electromagnetic Modeling (2006-2009,2015)
EE6831  Advanced Electromagnetic Theory and Applications (2013,2015,2016)