[論文レビュー] Electrically tunable VO2-metal metasurface for mid-infrared switching, limiting, and nonlinear isolation

Jonathan King, Chenghao Wan+5 more|arXiv (Cornell University)|Mar 16, 2023

Optical Wireless Communication Technologies被引用数 8

ひとこと要約

論文は、中赤外領域で電気的に制御可能な VO2-金属メタ表面を示し、金属のジュール加熱によって駆動される tunable optical switch、limiter、 nonlinear isolator として機能する。約100倍の透過変化と、 tunable なlimiting閾値とisolatorレンジを達成する。

ABSTRACT

We demonstrate an electrically controlled metal-VO2 metasurface for the mid-wave infrared that simultaneously functions as a tunable optical switch, an optical limiter with a tunable limiting threshold, and a nonlinear optical isolator with a tunable operating range. The tunability is achieved via Joule heating through the metal comprising the metasurface, resulting in an integrated optoelectronic device. As an optical switch, the device has an experimental transmission ratio of ~100 when varying the bias current. Operating as an optical limiter, we demonstrated tunability of the limiting threshold from 20 mW to 180 mW of incident laser power. Similar degrees of tunability are also achieved for nonlinear optical isolation, which enables asymmetric (nonreciprocal) transmission.

研究の動機と目的

• electrically controlled VO2-metal metasurface for mid-infrared operations.
• Demonstrate tunable switching, limiting, and nonlinear isolation within a single device.
• Quantify tunability of transmission, limiting threshold, and isolation range.
• Leverage Joule heating in the metal to achieve integrated optoelectronic control.

提案手法

• Fabricate a VO2-metal metasurface integrated with a Joule heating mechanism.
• Use Joule heating to induce VO2 phase transition through the metal component.
• Characterize optical transmission under varying bias current to assess switching performance.
• Measure limiting thresholds by varying incident laser power and recording onset of transmission suppression.
• Demonstrate tunable nonlinear isolation with asymmetric (nonreciprocal) transmission.
• Analyze the correlation between bias current, VO2 phase state, and optical response.

実験結果

リサーチクエスチョン

• RQ1 How can Joule heating of the metal in a VO2-metal metasurface achieve electrically tunable mid-IR switching, limiting, and nonlinear isolation?
• RQ2 What are the achievable tunable ranges for transmission, limiting threshold, and isolator operating window in this device?
• RQ3 How does the VO2 phase state modulate optical properties to enable nonreciprocal transmission?

主な発見

• Experimental transmission ratio of ~100 for switching as bias current is varied.
• Limiting threshold tunable from 20 mW to 180 mW of incident laser power.
• Similar tunability achieved for nonlinear optical isolation, enabling asymmetric transmission.
• Demonstrates integration of optoelectronic control with VO2-based metasurface in the mid-infrared.
• Shows concurrent functionality as a switch, limiter, and isolator in a single device.