Silicon-Enhanced Nanocavity: From Narrow Band Color Reflector to Broadband Near-Infrared Absorber
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arXiv
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| Format: | Preprint |
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2024
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| author | Dixit, Kirtan P. Gregory, Don A. |
| author_facet | Dixit, Kirtan P. Gregory, Don A. |
| contents | Subwavelength-scale light absorbers and reflectors have gained significant attention for their potential in photonic applications. These structures often utilize a metal-insulator-metal (MIM) architecture, similar to a Fabry-Perot nanocavity, using noble metals and dielectric or semiconductor spacers for narrow-band light absorption. In reflection mode, they function as band-stop filters, blocking specific wavelengths and reflecting others through Fabry-Perot resonance. Efficient color reflection requires asymmetric Fabry-Perot cavities, where metals with differing reflectivities and extinction coefficients enable substantial reflection for non-resonant wavelengths and near-perfect absorption at resonant ones. Unlike narrowband techniques, broadband absorption does not rely on a single resonance phenomenon. Recent developments show that integrating an asymmetric Fabry-Perot nanocavity with an anti-reflection coating achieves near-unity absorption across a broad wavelength range. This study introduces an asymmetric Fabry-Perot nanocavity with a dielectric-semiconductor-dielectric spacer, enabling near-unity color reflection. By incorporating silicon, the reflected color can be tuned with just a 5 nm thickness variation, while achieving broadband absorption over 70% in the 800-1600 nm range. The addition of an anti-reflection coating extends broadband absorption to near unity with minimal impact on reflected color. The planar, nanopattern-free design holds promise for display technologies with better color fidelity and applications in thermal photovoltaics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_15313 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Silicon-Enhanced Nanocavity: From Narrow Band Color Reflector to Broadband Near-Infrared Absorber Dixit, Kirtan P. Gregory, Don A. Optics Applied Physics Subwavelength-scale light absorbers and reflectors have gained significant attention for their potential in photonic applications. These structures often utilize a metal-insulator-metal (MIM) architecture, similar to a Fabry-Perot nanocavity, using noble metals and dielectric or semiconductor spacers for narrow-band light absorption. In reflection mode, they function as band-stop filters, blocking specific wavelengths and reflecting others through Fabry-Perot resonance. Efficient color reflection requires asymmetric Fabry-Perot cavities, where metals with differing reflectivities and extinction coefficients enable substantial reflection for non-resonant wavelengths and near-perfect absorption at resonant ones. Unlike narrowband techniques, broadband absorption does not rely on a single resonance phenomenon. Recent developments show that integrating an asymmetric Fabry-Perot nanocavity with an anti-reflection coating achieves near-unity absorption across a broad wavelength range. This study introduces an asymmetric Fabry-Perot nanocavity with a dielectric-semiconductor-dielectric spacer, enabling near-unity color reflection. By incorporating silicon, the reflected color can be tuned with just a 5 nm thickness variation, while achieving broadband absorption over 70% in the 800-1600 nm range. The addition of an anti-reflection coating extends broadband absorption to near unity with minimal impact on reflected color. The planar, nanopattern-free design holds promise for display technologies with better color fidelity and applications in thermal photovoltaics. |
| title | Silicon-Enhanced Nanocavity: From Narrow Band Color Reflector to Broadband Near-Infrared Absorber |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2411.15313 |