Tailoring the Thickness-Dependent Optical Properties of Conducting Nitrides and Oxides for Epsilon-Near-Zero-Enhanced Photonic Applications,Advanced Materials

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Tailoring the Thickness-Dependent Optical Properties of Conducting Nitrides and Oxides for Epsilon-Near-Zero-Enhanced Photonic Applications
Advanced Materials ( IF 27.4 ) Pub Date : 2022-08-02 , DOI: 10.1002/adma.202109546
Soham Saha ₁ , Mustafa Goksu Ozlu ₁ , Sarah N Chowdhury ₁ , Benjamin T Diroll ₂ , Richard D Schaller ₂ , Alexander Kildishev ₁ , Alexandra Boltasseva _{1,

3} , Vladimir M Shalaev _{1,

3}

Affiliation

The unique properties of the emerging photonic materials, conducting nitrides and oxides, especially their tailorability, large damage thresholds, and, importantly, the so-called epsilon-near-zero (ENZ) behavior, have enabled novel photonic phenomena spanning optical circuitry, tunable metasurfaces, and nonlinear optical devices. This work explores direct control of the optical properties of polycrystalline titanium nitride (TiN) and aluminum-doped zinc oxide (AZO) by tailoring the film thickness, and their potential for ENZ-enhanced photonic applications. This study demonstrates that TiN–AZO bilayers support Ferrell–Berreman modes using the thickness-dependent ENZ resonances in the AZO films operating in the telecom wavelengths spanning from 1470 to 1750 nm. The bilayer stacks also act as strong light absorbers in the ultraviolet regime using the radiative ENZ modes and the Fabry–Perot modes in the constituent TiN films. The studied Berreman resonators exhibit optically induced reflectance modulation of 15% with picosecond response time. Together with the optical response tailorability of conducting oxides and nitrides, using the field enhancement near the tunable ENZ regime can enable a wide range of nonlinear optical phenomena, including all-optical switching, time refraction, and high-harmonic generation.

中文翻译：

为 Epsilon 近零增强光子应用定制导电氮化物和氧化物的厚度相关光学特性

新兴光子材料（导电氮化物和氧化物）的独特性质，特别是它们的可定制性、大损伤阈值，以及重要的是所谓的ε近零（ENZ）行为，使得跨越光电路、可调谐的新颖光子现象成为可能。超表面和非线性光学器件。这项工作探索了通过定制薄膜厚度来直接控制多晶氮化钛 (TiN) 和铝掺杂氧化锌 (AZO) 的光学特性，以及它们在 ENZ 增强光子应用中的潜力。这项研究表明，TiN-AZO 双层利用 AZO 薄膜中厚度相关的 ENZ 共振，在 1470 至 1750 nm 的电信波长范围内支持 Ferrell-Berreman 模式。双层堆叠还利用构成 TiN 薄膜中的辐射 ENZ 模式和法布里-珀罗模式，在紫外线范围内充当强光吸收器。研究的 Berreman 谐振器表现出 15% 的光感应反射率调制和皮秒响应时间。结合导电氧化物和氮化物的光学响应可定制性，使用可调谐 ENZ 区域附近的场增强可以实现各种非线性光学现象，包括全光切换、时间折射和高次谐波生成。

更新日期：2022-08-02

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