Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.00826 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929522759172096 |
|---|---|
| author | Perido, Joanna Denis, Kevin Clancy, Sean O. Cothard, Nicholas F. Day, Peter K. Glenn, Jason Leduc, Henry Quijada, Manuel Patel, Jessica Wollack, Edward |
| author_facet | Perido, Joanna Denis, Kevin Clancy, Sean O. Cothard, Nicholas F. Day, Peter K. Glenn, Jason Leduc, Henry Quijada, Manuel Patel, Jessica Wollack, Edward |
| contents | Future far-infrared (IR) observatories require compact and cost efficient optical linear variable bandpass filters (LVBFs) to define their instrument spectral bands. We have designed novel far-IR LVBFs that consist of metal-mesh bandpass filters comprised of a gold film with cross-slots of varying sizes along a silicon (Si) substrate with anti-reflection (AR) coatings. We present our work on the simulated and measured transmission of non-AR coated and AR coated LVBFs for bandpass peaks from wavelengths of 24 to 36 $μ$m with a resolving power ($R=λ_0/Δλ$) of R$\approx$6 for non-AR coated LVBFs and R$\approx$4 for AR coated LVBFs. We also present a method to decrease the effects of out-of-band high frequency transmission exhibited by metal-mesh filters by depositing a thin layer of hydrogenated amorphous silicon (a-Si:H) on the metal-mesh of the LVBF. We have fabricated and measured the LVBFs at room temperature and cryogenic temperatures (5 K). We measure a high peak transmission of $\sim$80-90 \% for the AR coated LVBF at 5 K and demonstrate that the a-Si:H LVBF is a promising method to address out-of-band high frequency transmission. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_00826 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Metal-Mesh Linear Variable Filter for Far-Infrared Wavelengths Perido, Joanna Denis, Kevin Clancy, Sean O. Cothard, Nicholas F. Day, Peter K. Glenn, Jason Leduc, Henry Quijada, Manuel Patel, Jessica Wollack, Edward Instrumentation and Methods for Astrophysics Applied Physics Optics Future far-infrared (IR) observatories require compact and cost efficient optical linear variable bandpass filters (LVBFs) to define their instrument spectral bands. We have designed novel far-IR LVBFs that consist of metal-mesh bandpass filters comprised of a gold film with cross-slots of varying sizes along a silicon (Si) substrate with anti-reflection (AR) coatings. We present our work on the simulated and measured transmission of non-AR coated and AR coated LVBFs for bandpass peaks from wavelengths of 24 to 36 $μ$m with a resolving power ($R=λ_0/Δλ$) of R$\approx$6 for non-AR coated LVBFs and R$\approx$4 for AR coated LVBFs. We also present a method to decrease the effects of out-of-band high frequency transmission exhibited by metal-mesh filters by depositing a thin layer of hydrogenated amorphous silicon (a-Si:H) on the metal-mesh of the LVBF. We have fabricated and measured the LVBFs at room temperature and cryogenic temperatures (5 K). We measure a high peak transmission of $\sim$80-90 \% for the AR coated LVBF at 5 K and demonstrate that the a-Si:H LVBF is a promising method to address out-of-band high frequency transmission. |
| title | Metal-Mesh Linear Variable Filter for Far-Infrared Wavelengths |
| topic | Instrumentation and Methods for Astrophysics Applied Physics Optics |
| url | https://arxiv.org/abs/2410.00826 |