| Title | Anapole mediated giant photothermal nonlinearity in nanostructured silicon |
| Authors | Zhang, Tianyue Che, Ying Chen, Kai Xu, Jian Xu, Yi Wen, Te Lu, Guowei Liu, Xiaowei Wang, Bin Xu, Xiaoxuan Duh, Yi-Shiou Tang, Yu-Lung Han, Jing Cao, Yaoyu Guan, Bai-Ou Chu, Shi-Wei Li, Xiangping |
| Affiliation | Jinan Univ, Inst Photon Technol, Guangdong Prov Key Lab Opt Fiber Sensing & Commun, Guangzhou 510632, Peoples R China Nankai Univ, Sch Phys, Key Lab Weak Light Nonlinear Photon, Minist Educ, Tianjin 300071, Peoples R China Jinan Univ, Coll Informat Sci & Technol, Dept Elect Engn, Guangzhou 510632, Peoples R China Peking Univ, Frontiers Sci Ctr Nanooptoelect, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China Natl Taiwan Univ, Dept Phys, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan Natl Tsing Hua Univ, Brain Res Ctr, 101,Sec 2,Guangfu Rd, Hsinchu 30013, Taiwan |
| Keywords | 3RD HARMONIC-GENERATION AMORPHOUS-SILICON OPTICAL FUNCTIONS SCATTERING ENHANCEMENT RESONANCES MODES RAMAN |
| Issue Date | 15-Jun-2020 |
| Publisher | NATURE COMMUNICATIONS |
| Abstract | Featured with a plethora of electric and magnetic Mie resonances, high index dielectric nanostructures offer a versatile platform to concentrate light-matter interactions at the nanoscale. By integrating unique features of far-field scattering control and near-field concentration from radiationless anapole states, here, we demonstrate a giant photothermal nonlinearity in single subwavelength-sized silicon nanodisks. The nanoscale energy concentration and consequent near-field enhancements mediated by the anapole mode yield a reversible nonlinear scattering with a large modulation depth and a broad dynamic range, unveiling a record-high nonlinear index change up to 0.5 at mild incident light intensities on the order of MW/cm(2). The observed photothermal nonlinearity showcases three orders of magnitude enhancement compared with that of unstructured bulk silicon, as well as nearly one order of magnitude higher than that through the radiative electric dipolar mode. Such nonlinear scattering can empower distinctive point spread functions in confocal reflectance imaging, offering the potential for far-field localization of nanostructured Si with an accuracy approaching 40nm. Our findings shed new light on active silicon photonics based on optical anapoles. |
| URI | http://hdl.handle.net/20.500.11897/591036 |
| ISSN | 2041-1723 |
| DOI | 10.1038/s41467-020-16845-x |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 |
