Two-beam nonlinearity in indium tin oxide in the continuous wave limit

Published

March 15, 2023

Author(s)

Jared Wahlstrand, Chad Cruz

Abstract

Indium tin oxide (ITO) is an example of a material with a greatly enhanced optical nonlinearity for wavelengths at which the dielectric permittivity is near zero. Its enormous nonlinearity may enable compact photonic devices. All-optical devices involve multiple beams, and it was found recently [Paul et al., Optics Letters 46, 428-431 (2021)] that two-beam interaction modifies the effective nonlinearity in ITO for co-polarized beams. In that work, results of a degenerate pump-probe experiment were compared to a numerical model of the hot electron nonlinearity in ITO. The numerical model successfully explained the polarization dependent differential transmission and reflection, including the dependence on the chirp of the pulses. Here, we consider a simpler analytical model for the two-beam interaction in the continuous wave limit. We directly test this analytical model using a nondegenerate pump-probe transmission experiment using long pulses and find reasonable agreement.

Proceedings Title

SPIE Proceedings Volume 12419, Ultrafast Phenomena and Nanophotonics XXVII

Volume

12419

Conference Dates

January 29-February 1, 2023

Conference Location

San Francisco, CA, US

Conference Title

SPIE Photonics West, Ultrafast Phenomena and Nanophotonics XXVII

Pub Type

Conferences

Download Paper

https://doi.org/10.1117/12.2651553

Local Download

Keywords

nonlinear optics, ultrafast optical spectroscopy

Citation

Wahlstrand, J. and Cruz, C. (2023), Two-beam nonlinearity in indium tin oxide in the continuous wave limit, SPIE Proceedings Volume 12419, Ultrafast Phenomena and Nanophotonics XXVII, San Francisco, CA, US, [online], https://doi.org/10.1117/12.2651553, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=936281 (Accessed April 27, 2026)

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