Design of an Integrated Circularly Polarized HgCdTe Photodetector Based on Silicon Metasurfaces
Compared with conventional detectors, a circularly polarized detector operating at 4.26 μm effectively suppresses background noise (e.g., solar scattering and atmospheric interference), enabling high-precision CO<sub>2</sub> monitoring across ecosystems like farmland, forests, and wetlan...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
|
| Series: | Photonics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6732/12/5/519 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Compared with conventional detectors, a circularly polarized detector operating at 4.26 μm effectively suppresses background noise (e.g., solar scattering and atmospheric interference), enabling high-precision CO<sub>2</sub> monitoring across ecosystems like farmland, forests, and wetlands. This capability allows the precise quantification of carbon sink potential and ecosystem health. Our design employs a mid-wave HgCdTe detector—a well-established platform—combined with a CMOS-compatible Si/SiO<sub>2</sub> metasurface. Geometric displacements were applied to break C<sub>2</sub> symmetry, achieving a chiral design. Through multiparameter optimization, we realized a circularly polarized photodetector (CPPD) with a CPER of 18 dB, expected to demonstrate superior CO<sub>2</sub> monitoring performance. These advances may offer researchers and practitioners a robust tool for both fundamental studies and field deployments. |
|---|---|
| ISSN: | 2304-6732 |