Tunable hybrid optical modes in a bounded cholesteric liquid crystal with a twist defect

Abstract

Coupling between the defect mode of a cholesteric liquid crystal and the localized mode of a cholesteric liquid crystal-phase plate-metal structure is theoretically demonstrated. It is shown that the transmittance spectrum can be tuned by changing the twist-defect angle and helix pitch, which are governed by external factors. The spectra for different circular polarizations of the incident light are different; specifically, at the nondiffracting polarization, there is no defect-mode transmittance peak.

Topological charge conversion and localization in defected heterogeneous multihelicoidal optical fibers

“…Insertion of defects into the structure of a PC may expand the possibilities of controlling electromagnetic radiation. As has been shown, the systems that consist of CLCs separated by defects of various kinds can emit at the frequencies corresponding to defect-localized photonic states [20,[29][30][31][32]. This circumstance is used when creating low-threshold lasers.…”

“…For example, volume many-directional bandgap reflection of light by PCs is used in wide-angle optical splitters [4,5], which is critical while creating tightly packed optical microcircuits. Also it is possible to create on the basis of PCs the frequency splitters [6,7], optical logic gates [8], lasers [9,10], sensors, optical filters [11][12][13][14][15][16][17] and other devices [18][19][20]. Recently, a significant amount of interest has been evoked by chiral PC microstructured fibers [21][22][23][24][25].…”

Enhanced Reflected Group Delay with Optical Tamm State via Graphene-Dielectric Bragg Mirror Configuration

“…OTS is a surface wave that is confined on the interface of two different media. It has grabbed the attention of researchers due to its strong locality to light and being easily excited [21][22][23][24][25]. In this paper, we proposed a novel structure consists of graphene and optical lattice; it can realize the enhancement of reflected group delay and switch between positive reflected group delay and negative reflected group delay of optical pulse.…”

Model of a tunable hybrid Tamm mode–liquid crystal device

“…The Tamm modes can be strongly coupled with each other or with resonances of a different nature, e.g., the cavity modes, exciton polaritons, and surface plasmons [17][18][19][20][21]. Such hybrid modes are characterized by the resonance quasi-crossing at the detuning of the position of one of the resonances, which is widely used in sensors [22,23].…”