Subwavelength asymmetric Au-VO2 nanodisk dimer for switchable directional scattering

• 来源期刊: 中国物理B（英文版）
• 关键词: localized surface plasmon resonance directional scattering vanadium dioxide
• 年，卷（期）: 2018,（11）
• 页码范围: 321-326
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/11/117301

摘要

We propose an asymmetric Au-VO2 nanodisk dimer for realizing a switchable directional scattering.Specifically,the directional scattering can be triggered on/off through controlling the phase transition of the VO2 nanodisk from metallic to semiconductor state.More strikingly,an obvious directional scattering with the directivity of～ 40 dB is achieved under themetallic state of VO2 nanodisk.This tunable directional scattering is further explained with an interference model where the Au and VO2 nanodisks are treated as two weakly interacting electric dipoles.The phase transition controlled scattering patterns of asymmetric Au-VO2 nanodisk dimer are then well interpreted from the phase difference between these two dipoles.