Efficient ultrafast all-optical modulation in a nonlinear crystalline gallium phosphide nanodisk at the anapole excitation

被引：74

作者：

Grinblat, Gustavo ^{[1
]}

Zhang, Haizhong ^{[2
]}

Nielsen, Michael P. ^{[3
]}

Krivitsky, Leonid ^{[2
]}

Berte, Rodrigo ^{[4
]}

Li, Yi ^{[4
,5
]}

Tilmann, Benjamin ^{[4
]}

Cortes, Emiliano ^{[4
]}

Oulton, Rupert F. ^{[6
]}

Kuznetsov, Arseniy, I ^{[2
]}

Maier, Stefan A. ^{[4
,6
]}

机构：

[1] Univ Buenos Aires, CONICET, FCEN, Dept Fis,IFIBA, Buenos Aires, DF, Argentina

[2] ASTAR, Inst Mat Res & Engn, Singapore 138634, Singapore

[3] Univ New South Wales, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia

[4] Ludwig Maximilians Univ Munchen, Chair Hybrid Nanosyst, Fak Phys, Nanoinst Munchen, D-80539 Munich, Germany

[5] Southern Univ Sci & Technol, MOE Engn Res Ctr Integrated Circuits Next Generat, Sch Microelect, Shenzhen 518055, Guangdong, Peoples R China

[6] Imperial Coll London, Dept Phys, Blackett Lab, London SW7 2AZ, England

来源：

SCIENCE ADVANCES | 2020年 / 6卷 / 34期

基金：

欧盟地平线“2020”; 英国工程与自然科学研究理事会;

关键词：

3RD HARMONIC-GENERATION; 2ND-HARMONIC GENERATION; 3RD-HARMONIC GENERATION; SYMMETRY;

D O I：

10.1126/sciadv.abb3123

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

High-refractive index nanostructured dielectrics have the ability to locally enhance electromagnetic fields with low losses while presenting high third-order nonlinearities. In this work, we exploit these characteristics to achieve efficient ultrafast all-optical modulation in a crystalline gallium phosphide (GaP) nanoantenna through the optical Kerr effect (OKE) and two-photon absorption (TPA) in the visible/near-infrared range. We show that an individual GaP nanodisk can yield differential reflectivity modulations of up to similar to 40%, with characteristic modulation times between 14 and 66 fs, when probed at the anapole excitation (AE). Numerical simulations reveal that the AE represents a unique condition where both the OKE and TPA contribute with the same modulation sign, maximizing the response. These findings highly outperform previous reports on sub-100-fs all-optical switching from resonant nanoscale dielectrics, which have demonstrated modulation depths no larger than 0.5%, placing GaP nanoantennas as a promising choice for ultrafast all-optical modulation at the nanometer scale.

引用

页数：6