Abstract
Organic microcavity lasers based on liquid crystals have attracted substantial attention due to their easy processing, compact volume and excellent tunable properties. However, the threshold of traditional holographic polymer dispersed liquid crystals (H-PDLCs) laser doped with dye is usually as high as several tens of μJ/pulse, which hinders its broad applications. Herein, we demonstrate a low-threshold lasing from quasicrystal based on H-PDLCs. An conjugated polymer poly (2-methoxy-5-(2'-ethyl-hexyloxy)-p-phenylenevinylene (MEH-PPV) film is coated on the inner surface of glass substrate to dramatically reduce the lasing threshold, which is 20 times lower than that of dye-doped microcavity laser. A low threshold, single-mode, linearly polarized lasing is achieved when the thickness of MEH-PPV film is optimized at 80 nm. Due to its easy fabrication, excellent performance and bio-compatibility, this compact coherent light source may be useful in lab-on-chip applications such as detection, sensing and analyzing, as well as display, optical communications, and other photonic fields.
Highlights
Organic microcavity lasers based on liquid crystals (LCs) have attracted substantial attention over past decades owing to their easy processing, compact volume and excellent tunable properties [1,2]
One possible explanation might be due to the high photoluminescence quantum yield (PLQY) of MEH-PPV comparing to laser dye DCM
It was well known that the dye material like DCM suffered from concentration quench, which resulted in low solubility of DCM in H-polymer dispersed liquid crystals (PDLCs) and was directly associated with the low PLQY
Summary
Organic microcavity lasers based on liquid crystals (LCs) have attracted substantial attention over past decades owing to their easy processing, compact volume and excellent tunable properties [1,2]. Two-dimensional (2D) quasicrystals with aperiodic structures have been fabricated by polymer dispersed liquid crystals (PDLCs) which exhibit advantages of tunability, compactness and easy processing. Features of mirrorless laser from quasicrystal based on H-PDLC include directional light source, simple fabrication process, low cost and tunability. This kind of laser can be used in many potential practical applications, e.g. high-resolution spectroscopic analyzing [18], high sensitive vapor sensors [19], and ultra-fast switches in optical data communication [20]. Due to its easy fabrication, excellent performance and bio-compatibility [24,25,26,27], this compact coherent light source may be useful in lab-on-chip applications such as detection, sensing and analyzing, and many other photonic fields
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