Giant photothermal nonlinearity in a single silicon nanostructure
| Autor: | Yu-Lung Tang, Katsumasa Fujita, Chih-Wei Chang, Yu-Ping Lo, Shi-Wei Chu, Hou-Xian Ding, Junichi Takahara, Ikuto Hotta, Yi-Shiou Duh, Kuo-Ping Chen, Pang-Han Wu, Jhen Hong Yang, Hao-Yu Cheng, Te-Hsin Yen, Yusuke Nagasaki, Kung-Hsuan Lin, Kentaro Nishida |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Nanostructure Nonlinear optics Silicon Science Silicon photonics General Physics and Astronomy chemistry.chemical_element Physics::Optics 02 engineering and technology 01 natural sciences Article General Biochemistry Genetics and Molecular Biology 010309 optics 0103 physical sciences lcsh:Science Photonic crystal Multidisciplinary business.industry General Chemistry Nanosecond Photothermal therapy 021001 nanoscience & nanotechnology Publisher Correction chemistry Metamaterials Optoelectronics lcsh:Q Photonics 0210 nano-technology business |
| Zdroj: | Nature Communications, Vol 11, Iss 1, Pp 1-9 (2020) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Silicon photonics have attracted significant interest because of their potential in integrated photonics components and all-dielectric meta-optics elements. One major challenge is to achieve active control via strong photon–photon interactions, i.e. optical nonlinearity, which is intrinsically weak in silicon. To boost the nonlinear response, practical applications rely on resonant structures such as microring resonators or photonic crystals. Nevertheless, their typical footprints are larger than 10 μm. Here, we show that 100 nm silicon nano-resonators exhibit a giant photothermal nonlinearity, yielding 90% reversible and repeatable modulation from linear scattering response at low excitation intensities. The equivalent nonlinear index is five-orders larger compared with bulk, based on Mie resonance enhanced absorption and high-efficiency heating in thermally isolated nanostructures. Furthermore, the nanoscale thermal relaxation time reaches nanosecond. This large and fast nonlinearity leads to potential applications for GHz all-optical control at the nanoscale and super-resolution imaging of silicon. Resonant structures are a promising method to enhance the nonlinear response of Si, however they are typically larger than 10 μm. Here, the authors present Si nano-resonators that amplify photothermal nonlinearity, resulting in reversible and repeatable modulation. |
| Databáze: | OpenAIRE |
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