Electrically Switchable, One‐Dimensional Polymeric Resonators from Holographic Photopolymerization: A New Approach for Active Photonic Bandgap Materials

Abstract

Stimulated emission is demonstrated by optically pumping chromophores within the liquid‐crystal domains of 1D bandgap structures that are derived from holographic polymer‐dispersed liquid‐crystal (H‐PDLC) gratings (see Figure). Electrically switchable laser resonance is also possible using the H‐PDLC, since applying an electric field across the grating aligns the directors of the liquid crystal, diminishing the refractive index profile and, consequently, the lasing action.

The influence of N-vinyl-2-pyrrolidinone in polymerization of holographic polymer dispersed liquid crystals (HPDLCs)

“…In particular, HPDLCs offer the novel performance capability of dynamically switchable transmissive and reflective diffraction gratings. HPDLC gratings have already been demonstrated successfully in optically switchable Bragg reflectors [1], distributed feedback elements [2], active photonic bandgap materials [3] and display devices [4].…”

Field dependence of the magnetocaloric effect in core-shell nanoparticles

“…17 The Co core Ag shell and Ni core Ag shell particles were synthesized by replacing the surface layer of Co and Ni nanoparticles with Ag using the transmetallation reaction. 18 The particle morphologies were probed by transmission electron microscopy ͑Fig. 1͒.…”

Photonic crystals and microlasers fabricated with low refractive index material

“…Liu et al first provide analytical solution (AS) [115,116] of wave transport in the PCs with low refractive index material (such as photopolymers [117], liquid [118,119], or DCG [111,120,121]), and some unique properties can be seen clearly from the AS. From the detailed analysis of the AS [116], it can be seen that 2-D absolute band gaps (ABGs, band gaps for both TE and TM waves) cannot be achieved in the strict period PC structure with low refractive index materials.…”