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ABSTRACT:
SUBMITTER: Carletti L
PROVIDER: S-EPMC10515699 | biostudies-literature | 2023 Sep
REPOSITORIES: biostudies-literature
Carletti Luca L McDonnell Cormac C Arregui Leon Unai U Rocco Davide D Finazzi Marco M Toma Andrea A Ellenbogen Tal T Della Valle Giuseppe G Celebrano Michele M De Angelis Costantino C
ACS photonics 20230828 9
We investigate nonlinear THz generation from lithium niobate films and crystals of different thicknesses by optical rectification of near-infrared femtosecond pulses. A comparison between numerical studies and polarization-resolved measurements of the generated THz signal reveals a 2 orders of magnitude enhancement in the nonlinear response compared to optical frequencies. We show that this enhancement is due to optical phonon modes at 4.5 and 7.45 THz and is most pronounced for films thinner th ...[more]