Chiral-Selective Tamm Plasmon Polaritons.

Meng-Ying Lin,Rashid G Bikbaev,Ivan V Timofeev,Wei Lee,Wen-Hui Xu,Kuo-Ping Chen,Jhen-Hong Yang,Chang-Ruei Li

doi:10.3390/ma14112788

Abstract

Chiral-selective Tamm plasmon polariton (TPP) has been investigated at the interface between a cholesteric liquid crystal and a metasurface. Different from conventional TPP that occurs with distributed Bragg reflectors and metals, the chiral–achiral TPP is successfully demonstrated. The design of the metasurface as a reflective half-wave plate provides phase and polarization matching. Accordingly, a strong localized electric field and sharp resonance are observed and proven to be widely tunable.

Highlights

In recent years, metamaterials have been widely utilized in photoelectronics due to the advances in controlling the phase, polarizations, and chirality
Chirality surface states could be observed on the surface of topological materials [7] or at the interface of two cholesteric liquid crystals (CLCs) [8,9]
The excitation of chiral-selective Tamm plasmon polariton (TPP) at the interface between a CLC and a flat metal film is impossible, and the resonance dip cannot be seen within the CLC stopband [20] unless the polarization of reflected light from the metal is changed

Summary

Introduction

Metamaterials have been widely utilized in photoelectronics due to the advances in controlling the phase, polarizations, and chirality. It would be difficult to be observed at a chiral–achiral interface as the polarization state could not be preserved An example of such an interface state is Tamm plasmon polariton (TPP). The excitation of chiral-selective TPP at the interface between a CLC and a flat metal film is impossible (please see Figure 1a,b), and the resonance dip cannot be seen within the CLC stopband [20] unless the polarization of reflected light from the metal is changed. The high reflection of the CLC stopband can be maintained without the localization of the light at the interface between the CLC and the metal. In this regard, a novel design combining a CLC and a half-wave plate metasurface is proposed. The tuning of the chiral-TPP wavelength is shown by varying the temperature

Description of the Model

Results

Conclusions