Our paper "Larger-Than-Unity External Optical Field Confinement Enabled by Metamaterial-Assisted Comb Waveguide for Ultrasensitive Long-Wave Infrared Gas Spectroscopy" is selected as the front cover of Nano Letters, Volume 22, Issue 15.

Nanophotonic waveguides that implement long optical pathlengths on chips are promising for enabling miniaturized spectroscopic sensors for widespread IoT applications. Here, an all-dielectric metamaterial-assisted comb waveguide was developed. It possesses an extraordinary external optical field confinement, outperforming free-space optics with superior light‒matter interaction.