Open AccessLithium niobate and lithium tantalate based scalable terahertz pulse sources in reflection geometry
Author(s) -
Gergő Krizsán,
Zoltán Tibai,
J. Hebling,
László Pálfalvi,
Gábor Almási,
György Tóth
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.405748
Subject(s) - lithium niobate , lithium tantalate , materials science , optics , refractive index , reflection (computer programming) , diffraction , tantalate , terahertz radiation , nonlinear optics , diffraction efficiency , laser , optoelectronics , ferroelectricity , physics , computer science , dielectric , programming language
A new type of THz source, working in reflection geometry, is proposed, where the pulse-front-tilt is introduced by a periodically micro-structured metal profile. For optical coupling, high refractive index nanocomposite fluid is used between the nonlinear optical material and the structured metal surface. Numerical simulations predict ∼87 and ∼85% optimized diffraction efficiencies for lithium niobate and lithium tantalate at 1030 and 800 nm pump wavelengths. The largest diffraction efficiencies can be achieved for a larger refractive index of the nanocomposite fluid than the index of the nonlinear material, for both cases. THz generation efficiencies of ∼3 and ∼1% are predicted for lithium niobate and lithium tantalate, respectively.