Optical second-harmonic generation from ultrathin niobium films

Anatoly V. Zayats; Evgenyi A. Vinogradov; Ole Keller; Kjeld Pedersen; Ansheng Liu; Fedor A. Pudonin

doi:10.1117/12.242120

10 June 1996 Optical second-harmonic generation from ultrathin niobium films

Anatoly V. Zayats, Evgenyi A. Vinogradov, Ole Keller, Kjeld Pedersen, Ansheng Liu, Fedor A. Pudonin

Proceedings Volume 2801, Nonlinear Optics of Low-Dimensional Structures and New Materials; (1996) https://doi.org/10.1117/12.242120
Event: International Conference on Coherent and Nonlinear Optics, 1995, St. Petersburg, Russian Federation

Abstract

Experimental and theoretical investigations of the optical second-harmonic generation (SHG) from ultrathin niobium films embedded in a dielectric are presented. The dependence of the intensity of second-harmonic emission on the film thickness (in the range from 6 to 42 angstroms) and the angular dependencies of SHG are investigated for different polarization configurations. The thickness dependencies of the second-harmonic intensity reveal resonant behavior: the p_(omega )-to-p_2(omega ) second-harmonic intensity exhibits a pronounced maximum for a film thickness of approximately 15 angstroms while the s_(omega )-to-p_2(omega ) second-harmonic signal exhibits a step-like increase at the same thickness. By modeling the metal film as a symmetric quantum well, a microscopic local-field calculation of the second-harmonic generation is performed, and numerical results for the thickness and angular dependencies of the second-harmonic energy reflection coefficient are presented. Using simply infinite-barrier wave functions together with a self-field approximation the theoretical calculations qualitatively describe the observed thickness dependence of the second-harmonic generation which can be accounted for by the intersubband transitions in the quantum wells formed by the niobium films.

Citation Download Citation

Anatoly V. Zayats, Evgenyi A. Vinogradov, Ole Keller, Kjeld Pedersen, Ansheng Liu, and Fedor A. Pudonin "Optical second-harmonic generation from ultrathin niobium films", Proc. SPIE 2801, Nonlinear Optics of Low-Dimensional Structures and New Materials, (10 June 1996); https://doi.org/10.1117/12.242120

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