Time-Dependent Ultrafast Quadratic Nonlinearity in an Epsilon-Near-Zero Platform

Bykov, Anton Yu.1,2; Deng, Junhong3; Li, Guixin4; Zayats, Anatoly V.1,2

2024-03-14

10.1021/acs.nanolett.4c00282

NANO LETTERS   影响因子和分区

1530-6984

1530-6992

Ultrafast nonlinearity, which results in modulation of the linear optical response, is a basis for the development of time-varying media, in particular those operating in the epsilon-near-zero (ENZ) regime. Here, we demonstrate that the intraband excitation of hot electrons in the ENZ film results in a second-harmonic resonance shift of similar to 10 THz (40 nm) and second-harmonic generation (SHG) intensity changes of >100% with only minor (<1%) changes in linear transmission. The modulation is 10-fold enhanced by a plasmonic metasurface coupled to a film, allowing for ultrafast modulation of circularly polarized SHG. The effect is described by the plasma frequency renormalization in the ENZ material and the modification of the electron damping, with a possible influence of the hot-electron dynamics on the quadratic susceptibility. The results elucidate the nature of the second-order nonlinearity in ENZ materials and pave the way to the rational engineering of active nonlinear metamaterials and metasurfaces for time-varying applications.

hot-carrier dynamics epsilon-near-zero materials plasmonic metasurfaces second harmonic generation ultrafast all-optical modulation

SCI ; EI

英语

其他

European Commission[789340] ; ERC iCOMM project[EP/Y015673/1]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001185151800001

AMER CHEMICAL SOC

MATERIALS SCIENCE

Web of Science

1.Kings Coll London, Dept Phys, London WS2R 2LS, England
2.Kings Coll London, London Ctr Nanotechnol, London WS2R 2LS, England
3.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Bykov, Anton Yu.,Deng, Junhong,Li, Guixin,et al. Time-Dependent Ultrafast Quadratic Nonlinearity in an Epsilon-Near-Zero Platform[J]. NANO LETTERS,2024,24(12).

Bykov, Anton Yu.,Deng, Junhong,Li, Guixin,&Zayats, Anatoly V..(2024).Time-Dependent Ultrafast Quadratic Nonlinearity in an Epsilon-Near-Zero Platform.NANO LETTERS,24(12).

Bykov, Anton Yu.,et al."Time-Dependent Ultrafast Quadratic Nonlinearity in an Epsilon-Near-Zero Platform".NANO LETTERS 24.12(2024).