Lasing from chiral photonic band gap materials based on cholesteric glasses

Quantum Dot Fluorescence in Photonic Bandgap Glassy Cholesteric Liquid Crystal Structures: Microcavity Resonance under CW-Excitation, Antibunching and Decay Time

“…We placed NQD-doped oligomeric material on a buffed coverslip, and heated it to above the CLC oligomer clearing temperature, T c ∼180 • C. The sample was then cooled to ∼135 • C, a second coverslip was placed above the first, and the two coverslips were sheared in the direction of buffing. The oligomer was then slowly cooled to the glassy state [9][10][11][12][13][14][15][16][17][18], preserving planar-aligned CLC order (the glass-transition temperature T g is ∼50 • C [18]). ] of a home-made, confocal fluorescence microscope with an oil-immersion, 1.35 NA objective to focus laser light into the CLC cell.…”

“…One of the vibrant areas in ultrathin tunable laser development is the utilization of photonic bandgap properties of planar-aligned cholesteric (chiral nematic) liquid crystal (CLC) structures doped with dyes to create tunable compact lasers [1][2][3][4][5][6][7][8][9][10] for applications ranging from miniature medical diagnostic tools to large-area holographic laser displays [4]. Recently, liquid crystals (LC) doped with single emitters were used in polarized single-photon sources for secure quantum communication applications [11][12][13][14][15][16].…”

Dye-doped cholesteric lasers: Distributed feedback and photonic bandgap lasing models

“…However, this model is closely related to the model developed in [4] presenting a number of advantages in the description of the mode structure of a lasing spectrum and the threshold selectivity by modes with increasing orders. Work [14] was followed by the studies of a lasing on new dye-doped CLC-materials [16][17][18][19], undoped CLCs [20], as well as on liquid crystal elastomers [21], polymerized CLC [22], cholesteric blue phase [23], and glassy liquid crystals [24].…”

Lasing in Three Layer Systems Consisting of Cholesteric Liquid Crystals and Dye Solution

“…Moreover the consideration of the selective reflection band as a photonic band-gap stimulated the investigation of lasing in several chiral materials, such as thermotropic [12] and lyotropic [13] CLCs, blue [14] and TGB phases [15], chiral smectic C liquid crystals [16], polymer networks [17], elastomers [18] and glass forming CLCs [19]. 98=[450] G. Chilaya et al…”