Linear Terahertz Frequency Conversion in a Temporal-Boundary Metasurface

Xu, Guizhen1; Xing, Hongyang1; Lu, Dan1; Fan, Junxing1; Xue, Zhanqiang1; Shum, Perry Ping1,2; Cong, Longqing1,2

2024-07-01

10.1002/lpor.202301294

LASER & PHOTONICS REVIEWS   影响因子和分区

1863-8880

1863-8899

["Linear frequency conversion enabled by a temporal boundary of a resonant cavity provides a promising alternative to generating new frequency components, where the temporal boundary can be introduced by rapidly modifying the refractive index of the cavity. However, the perturbed photon dynamics during the ultrafast linear process is still vague. Here, the photon dynamics based on temporal coupled-mode theory are explored and the phenomena are demonstrated with a silicon metasurface via simulations and experiments in the terahertz regime. With the time-varying real and imaginary parts of the refractive index, a periodic modulation (Td) of the amplification coefficient of the newly generated photons is observed where the optimized coefficient occurs in the first period at td = Td /2. It further establishes a dynamic critical coupling condition to improve the amplification coefficient in the dynamic process. The scheme of linear frequency conversion via temporal boundary can revolutionize the paradigm of parametric amplification from nonlinear to linear processes, and conversion efficiency will be improved in a high-quality factor cavity. The ultrafast modulation will find applications in optical signal processing, modulators, and reconfigurable intelligent surfaces for development of the next-generation communications.","Temporal boundary is an attractive topic in photonics. This work explores the photon dynamics enabled by a temporal boundary based on temporal coupled-mode theory and experimentally verifies the phenomena with a terahertz metasurface. The scheme of linear frequency conversion can find applications in parametric amplification, ultrafast modulators, and tunable terahertz sources. image"]

frequency conversion temporal boundary temporal coupled mode theory terahertz metasurfaces ultrafast photonics

SCI ; EI

英语

第一 ; 通讯

Guangdong Basic and Applied Basic Research Foundation[2023A1515011085] ; Shenzhen Science and Technology Program["20220815151149004","JCYJ20230807093617036","JSGGKQTD20221101115656030"] ; null[62175099] ; null[62335011]

Optics ; Physics

Optics ; Physics, Applied ; Physics, Condensed Matter

WOS:001175519000001

WILEY-V C H VERLAG GMBH

20240915658005

Amplification ; Conversion efficiency ; Optical frequency conversion ; Optical waveguides ; Refractive index

Energy Conversion Issues:525.5 ; Waveguides:714.3 ; Light/Optics:741.1 ; Nonlinear Optics:741.1.1 ; Optical Devices and Systems:741.3 ; Atomic and Molecular Physics:931.3

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, State Key Lab Opt Fiber & Cable Manufacture Techno, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Key Lab Integrated Optoelect Intellisens, Shenzhen 518055, Peoples R China

Xu, Guizhen,Xing, Hongyang,Lu, Dan,et al. Linear Terahertz Frequency Conversion in a Temporal-Boundary Metasurface[J]. LASER & PHOTONICS REVIEWS,2024,18(7).

Xu, Guizhen.,Xing, Hongyang.,Lu, Dan.,Fan, Junxing.,Xue, Zhanqiang.,...&Cong, Longqing.(2024).Linear Terahertz Frequency Conversion in a Temporal-Boundary Metasurface.LASER & PHOTONICS REVIEWS,18(7).

Xu, Guizhen,et al."Linear Terahertz Frequency Conversion in a Temporal-Boundary Metasurface".LASER & PHOTONICS REVIEWS 18.7(2024).