Compact broadband thermal absorbers based on plasmonic fractal metasurfaces
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916811160682496 |
|---|---|
| author | Audhkhasi, Romil Tara, Virat Yu, Raymond Povinelli, Michelle L. Majumdar, Arka |
| author_facet | Audhkhasi, Romil Tara, Virat Yu, Raymond Povinelli, Michelle L. Majumdar, Arka |
| contents | The ability to efficiently absorb thermal radiation within a small material volume is crucial for the realization of compact and high spatial resolution thermal imagers. Here we propose and experimentally demonstrate a compact plasmonic metasurface for broadband absorption in the 6 to 14 microns wavelength range. As opposed to previous works, our metasurface leverages strongly localized electromagnetic modes to achieve high absorption within a compact form factor. We numerically investigate the spectral response of finite arrays of fractals and show that the absorption enhancement provided by arrays with greater than 6x6 fractals covering a total area of only 30x30 microns squared is similar to that of an infinitely periodic array. Furthermore, we experimentally validate our metasurface's absorption enhancement and demonstrate a good qualitative agreement between the measured and simulated spectral responses. Owing to its ability to achieve broadband absorption enhancement in a compact footprint, our metasurface provides new avenues for the realization of next generation infrared sensors and bolometers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_20905 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Compact broadband thermal absorbers based on plasmonic fractal metasurfaces Audhkhasi, Romil Tara, Virat Yu, Raymond Povinelli, Michelle L. Majumdar, Arka Optics The ability to efficiently absorb thermal radiation within a small material volume is crucial for the realization of compact and high spatial resolution thermal imagers. Here we propose and experimentally demonstrate a compact plasmonic metasurface for broadband absorption in the 6 to 14 microns wavelength range. As opposed to previous works, our metasurface leverages strongly localized electromagnetic modes to achieve high absorption within a compact form factor. We numerically investigate the spectral response of finite arrays of fractals and show that the absorption enhancement provided by arrays with greater than 6x6 fractals covering a total area of only 30x30 microns squared is similar to that of an infinitely periodic array. Furthermore, we experimentally validate our metasurface's absorption enhancement and demonstrate a good qualitative agreement between the measured and simulated spectral responses. Owing to its ability to achieve broadband absorption enhancement in a compact footprint, our metasurface provides new avenues for the realization of next generation infrared sensors and bolometers. |
| title | Compact broadband thermal absorbers based on plasmonic fractal metasurfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2506.20905 |