HgCdTe mid-Infrared photo response enhanced by monolithically integrated meta-lenses.

ABSTRACT: Polarization-independent dielectric meta-lens is proposed to monolithically integrate with a HgCdTe infrared photodetector to concentrate power flux into a reduced photosensitive area for performance enhancement. Although a reduction in photosensitive area could suppress the dark current, the more seriously reduced light absorptance would degrade the specific detectivity D^*. The integration of the meta-lens could reverse the situation by improving the absorptance of the photosensitive region. The meta-lens composed of an array of nano-pillars with varying diameters is formed by carving the CdZnTe substrate of the HgCdTe detector so that the integration could be accomplished in situ. The meta-lens focuses the incident light through the CdZnTe medium and at the HgCdTe photosensiti

SUBMITTER: Li F 

PROVIDER: S-EPMC7156491 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature