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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2109.14458 |
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| _version_ | 1866929493158920192 |
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| author | Hu, Jinhui Pérez, Luis A. Garcia-Pomar, Juan Luis Mihi, Agustín Garriga, Miquel Alonso, M. Isabel Goñi, Alejandro R. |
| author_facet | Hu, Jinhui Pérez, Luis A. Garcia-Pomar, Juan Luis Mihi, Agustín Garriga, Miquel Alonso, M. Isabel Goñi, Alejandro R. |
| contents | The transparency of silicon in the infrared region enables the design of nano/microstructures for implementation in devices to harvest the infrared (IR) part of the solar spectrum. Herein we report a strategy that uses arrays of inverted silicon pyramids covered with a thin gold film, which exhibit substantial light absorption in the infrared spectral range (below the gap of Si). The absorption stems from the resonant excitation at infrared wavelengths of surface-plasmon polaritons at the metal/dielectric interface mainly by tuning size and separation of the inverted pyramids. The array-parameters optimization proceeded by iteration of the calculation and measurement of the infrared response using finite difference time-domain simulations and Fourier-transform IR spectroscopy, respectively. We show two fabrication routes for this kind of metal/silicon metamaterials either by photolithography or scalable nanoimprint techniques for a seamless integration in optoelectronic fabrication processes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2109_14458 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Efficient infrared sunlight absorbers based on gold-covered, inverted silicon pyramid arrays Hu, Jinhui Pérez, Luis A. Garcia-Pomar, Juan Luis Mihi, Agustín Garriga, Miquel Alonso, M. Isabel Goñi, Alejandro R. Optics Materials Science The transparency of silicon in the infrared region enables the design of nano/microstructures for implementation in devices to harvest the infrared (IR) part of the solar spectrum. Herein we report a strategy that uses arrays of inverted silicon pyramids covered with a thin gold film, which exhibit substantial light absorption in the infrared spectral range (below the gap of Si). The absorption stems from the resonant excitation at infrared wavelengths of surface-plasmon polaritons at the metal/dielectric interface mainly by tuning size and separation of the inverted pyramids. The array-parameters optimization proceeded by iteration of the calculation and measurement of the infrared response using finite difference time-domain simulations and Fourier-transform IR spectroscopy, respectively. We show two fabrication routes for this kind of metal/silicon metamaterials either by photolithography or scalable nanoimprint techniques for a seamless integration in optoelectronic fabrication processes. |
| title | Efficient infrared sunlight absorbers based on gold-covered, inverted silicon pyramid arrays |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2109.14458 |