Temporal modulation of dielectric permittivity in transparent conducting oxides: from tunable photonics to new phenomena

Soham Saha; Mustafa Özlü; Vladimir M. Shalaev; Alexandra Boltasseva

doi:10.1117/12.2633185

3 October 2022 Temporal modulation of dielectric permittivity in transparent conducting oxides: from tunable photonics to new phenomena

Soham Saha, Mustafa Özlü, Vladimir M. Shalaev, Alexandra Boltasseva

Author Affiliations +

Proceedings Volume PC12197, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XX; PC121970F (2022) https://doi.org/10.1117/12.2633185
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

Ultrafast modulation of the dielectric permittivity of materials has made great strides in the past decade, resulting in practical applications such as beam-steering, and the realization of novel physical phenomena such as time refraction. Control over the dynamics of permittivity modulation adds an additional degree of freedom in tunable optics, broadening the scope of applications. In this presentation, we report our work on controlling the dynamic optical properties of transparent conducting oxides for a wide array of nonlinear optical demonstrations. We show large changes in the epsilon-near-zero points in undoped zinc oxide, with 20ps response time, and utilize the permittivity modulation to enhance the third-harmonic generation, and develop optically controlled polarization switches. With TiN-AZO Berreman-metasurfaces, we demonstrate wide tuning of the switching times varying from picosecond to nanosecond timescales. Employing the rapid permittivity modulation in aluminum-doped zinc oxide, we demonstrate time refraction in ENZ films. Our work will develop a better understanding of nonlinear optics employing ultrafast permittivity modulation at adjustable speeds, heralding the way to further novel optical phenomena such as photonic time crystals.

Conference Presentation

Citation Download Citation

Soham Saha, Mustafa Özlü, Vladimir M. Shalaev, and Alexandra Boltasseva "Temporal modulation of dielectric permittivity in transparent conducting oxides: from tunable photonics to new phenomena", Proc. SPIE PC12197, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XX, PC121970F (3 October 2022); https://doi.org/10.1117/12.2633185

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KEYWORDS

Modulation

Dielectrics

Photonics

Transparent conducting oxide

Dielectric polarization

Switching

Optical properties

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