Second harmonic generation and nonlinear frequency conversion in photonic time-crystals

Noa Konforty; Moshe-Ishay Cohen; Ohad Segal; Yonatan Plotnik; Vladimir M. Shalaev; Mordechai Segev

doi:10.1038/s41377-025-01788-z

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Second harmonic generation and nonlinear frequency conversion in photonic time-crystals

Original Articles

- Second harmonic generation and nonlinear frequency conversion in photonic time-crystals
- Light: Science & Applications Vol. 14, Issue 6, Pages: 1558-1566(2025)
- Affiliations：
  
  1.Physics Department, Technion—Israel Institute of Technology, Haifa, Israel
  2.Solid State Institute, Technion—Israel Institute of Technology, Haifa, Israel
  3.Department of Electrical and Computer Engineering, Technion—Israel Institute of Technology, Haifa, Israel
  4.School of Electrical and Computer Engineering, Birck Nanotechnology Center and Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, IN, USA
  5.Quantum Science Center (QSC), National Quantum Information Science Research Center of the U.S. Department of Energy (DOE), Oak Ridge, TN, USA
- Author bio：
  
  Mordechai Segev (msegev@technion.ac.il)
- Funds：
- DOI：10.1038/s41377-025-01788-z
  CLC：
- Received：22 October 2024，
  
  Revised：10 February 2025，
  
  Accepted：13 February 2025，
  
  Published Online：02 April 2025，
  
  Published：30 June 2025
- Accepted：
Scan QR Code
Konforty, N. et al. Second harmonic generation and nonlinear frequency conversion in photonic time-crystals. Light: Science & Applications, 14, 1558-1566 (2025).
DOI：

Konforty, N. et al. Second harmonic generation and nonlinear frequency conversion in photonic time-crystals. Light: Science & Applications, 14, 1558-1566 (2025). DOI： 10.1038/s41377-025-01788-z.

摘要

Abstract

We study the nonlinear process of second harmonic generation in photonic time-crystals

materials with refractive index that varies abruptly and periodically in time

and obtain the phase matching condition for this process. We find conditions for which the second harmonic generation is highly enhanced even in the absence of phase matching

governed by the exponential growth of the modes residing in the momentum gap of the photonic time crystal. Additionally

under these conditions

a cascade of higher-order harmonics is generated at growing exponential rates. The process is robust

with no requirement for phase-matching

the presence of a resonance or a threshold

drawing energy from the modulation.

关键词

Keywords

references

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