Modeling the optical properties of twisted bilayer photonic crystals
| Autor: | Eric Mazur, Clayton DeVault, Haoning Tang, Stephen Carr, Fan Du, Olivia Mello |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
FOS: Physical sciences Physics::Optics 02 engineering and technology 01 natural sciences Article Optical physics Condensed Matter::Superconductivity 0103 physical sciences Applied optics. Photonics 010306 general physics Electronic band structure Photonic crystal Photonic devices business.industry Bilayer QC350-467 Optics. Light 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials TA1501-1820 Brillouin zone Wavelength Optoelectronics Group velocity Photonics 0210 nano-technology business Bilayer graphene Optics (physics.optics) Physics - Optics |
| Zdroj: | Light: Science & Applications, Vol 10, Iss 1, Pp 1-8 (2021) Light, Science & Applications |
| ISSN: | 2047-7538 |
| Popis: | We demonstrate a photonic analog of twisted bilayer graphene that has ultra-flat photonic bands and exhibits extreme slow light behavior. Our twisted bilayer photonic device, which has an operating wavelength in C-band of the telecom window, uses two crystalline silicon photonic crystal slabs separated by a methyl methacrylate tunneling layer. We numerically determine the magic angle using a finite-element method and the corresponding photonic band structure, which exhibits a flat band over the entire Brillouin zone. This flat band causes the group velocity to approach zero and introduces light localization in a linear periodic photonic system. Using a plane-wave continuum model we find that photonic modes in twisted bilayer photonic crystals are not as tightly bound as their electronic counterparts in twisted bilayer graphene. In addition, the photonic system has a larger band asymmetry. The band structure can easily be engineered by adjusting the device geometry, giving significant freedom in the design of devices. Our work provides a fundamental understanding of the photonic properties of twisted bilayer photonic crystals and opens the door to nanoscale-based non-linear enhancement and superradiance. main text: 3727 words, 4 figures |
| Databáze: | OpenAIRE |
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