THz Field Induced Second Harmonic Generation in Epsilon Near Zero Indium Tin Oxide Thin Films.

ABSTRACT: Epsilon near zero (ENZ) thin films have attracted considerable attention due to their unique optical properties in the near-infrared (NIR), which have enabled a wide range of interesting phenomena and diverse applications. In nonlinear optics, the near-zero permittivity of films in the NIR region has been shown to enhance second-order nonlinear processes by several orders of magnitude, therefore boosting both second harmonic (SH) generation and broadband THz generation. In this work, we investigate THz-field-induced second harmonic (TFISH) generation in indium tin oxide (ITO) thin films in the ENZ spectral region. A symmetry-breaking electric field is applied using a high field strength broadband THz pulse, which when temporally overlapped with an ultrashort optical pulse, results in the e

SUBMITTER: McDonnell C 

PROVIDER: S-EPMC12356113 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature