Experimental implementation of tunable hybrid Tamm-microcavity modes

Abstract

Mode hybridization is a unique way to manipulate the mode inside a fixed cavity or at interface. For example, Tamm plasmon-polariton at solid interface can be spectrally shifted without tuning the interface. Experimental implementation of tunable hybrid Tamm-microcavity modes is reported. The hybrid modes are excited in a one-dimensional photonic crystal bounded with a gold layer by attaching a nematic liquid crystal microcavity. Coupling between Tamm plasmon-polariton and microcavity modes leads to repulsion of their dispersion curves controlled by the refractive index of a liquid crystal and the polarization of incident light. Effective tuning of hybrid modes through heating or applying an external electric field to the liquid crystal layer is demonstrated. The experimentally measured strength coupling value between Tamm and microcavity modes was 20.7 meV.

Hybrid Tamm and quasi-BIC microcavity modes

“…6(e). The proposed scheme paves a way for controlling not only the spectral position of hybrid modes’ resonances 32 but, most importantly, the resonant linewidth, see. Table S1 in ESI †…”

“…70 Due to the sensitivity of the LC to external factors, it is possible to dynamically tune the spectra of the microcavity. 32,55,[71][72][73] Fig. 6(a-c) shows the transmittance spectra of the microcavity as a function of the voltage applied to the LC layer for fixed values of the azimuthal angle ϕ.…”

“…Another dynamic control method is heating the LC layer. 32,40,75 Fig. 6(d and e) shows the transmittance spectra of the microcavity as a function of the temperature of the LC layer for fixed values of the azimuthal angle ϕ.…”

“…For example, when a PhC with a defect is coated with a metal layer, the TPP mode is coupled with the defect mode or, in other words, with the microcavity (MC) mode. [27][28][29][30][31] In our previous work 32 the control of the spectral position of hybrid TPP-MC modes in a PhC with a defect layer filled with a liquid crystal (LC) was experimentally demonstrated. The sensitivity of the LC to external factors makes it possible to efficiently control the MC modes as well as the TPP coupled with them.…”

Tunable Near-Infrared Transparent Bands Based on Cascaded Fabry–Perot Cavities Containing Phase Change Materials

“…The cascaded Fabry-Perot cavities (MD) 2 M can be treated as a system composed of two coupled oscillators. According to the coupled oscillator model [53][54][55][56][57][58][59][60], the Hamiltonian of the system can be determined by:…”