標題: Giant photothermal nonlinearity in a single silicon nanostructure
作者: Duh, Yi-Shiou
Nagasaki, Yusuke
Tang, Yu-Lung
Wu, Pang-Han
Cheng, Hao-Yu
Yen, Te-Hsin
Ding, Hou-Xian
Nishida, Kentaro
Hotta, Ikuto
Yang, Jhen-Hong
Lo, Yu-Ping
Chen, Kuo-Ping
Fujita, Katsumasa
Chang, Chih-Wei
Lin, Kung-Hsuan
Takahara, Junichi
Chu, Shi-Wei
光電系統研究所
影像與生醫光電研究所
Institute of Photonic System
Institute of Imaging and Biomedical Photonics
公開日期: 14-Aug-2020
摘要: 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 mu m. Here, we show that 100nm 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.
URI: http://dx.doi.org/10.1038/s41467-020-17846-6
http://hdl.handle.net/11536/155486
ISSN: 2041-1723
DOI: 10.1038/s41467-020-17846-6
期刊: NATURE COMMUNICATIONS
Volume: 11
Issue: 1
起始頁: 0
結束頁: 0
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