Novel promising terahertz optical material based on nanoporous SiO2

V. E. Ulitko; A. K. Zotov; A. A. Gavdush; G. M. Katyba; G. A. Komandin; I. E. Spektor; V. N. Kurlov; V. M. Masalov; K. I. Zaytsev

doi:10.1117/12.2567672

20 August 2020 Novel promising terahertz optical material based on nanoporous SiO₂

V. E. Ulitko, A. K. Zotov, A. A. Gavdush, G. M. Katyba, G. A. Komandin, I. E. Spektor, V. N. Kurlov, V. M. Masalov, K. I. Zaytsev

Author Affiliations +

Proceedings Volume 11499, Terahertz Emitters, Receivers, and Applications XI; 1149915 (2020) https://doi.org/10.1117/12.2567672
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Conference Poster

Abstract

In this article, we studied new porous material, which is based on artificial opals, made of 300-nm-diameter nanoporous SiO₂ globules and annealed at different temperatures in the range of 200–1500^◦C, as a prospective terahertz (THz) optical material. It was demonstrated experimentally that the THz optical properties of such material can be varied in a wide range (e.g. its refractive index varies from 1.65 to 1.95) by annealing, being a function of the total material porosity. Additionally, this material has rather low THz absorption coefficient (by field), which decreases from 10 to 1 cm⁻¹ with increasing annealing temperature. Based on the Bruggeman effective medium theory, the practical model was introduced to predict the optical properties of the considered material as a function of the annealing temperature. A wide tunability of refractive index and a low-to-moderate THz-wave absorption, make the discussed nanoporous SiO₂ a promising THz optical material.

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V. E. Ulitko, A. K. Zotov, A. A. Gavdush, G. M. Katyba, G. A. Komandin, I. E. Spektor, V. N. Kurlov, V. M. Masalov, and K. I. Zaytsev "Novel promising terahertz optical material based on nanoporous SiO₂", Proc. SPIE 11499, Terahertz Emitters, Receivers, and Applications XI, 1149915 (20 August 2020); https://doi.org/10.1117/12.2567672

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