Liquid crystal random lasers

Qu, Guangyin; Zhang, Xiaojuan; Li, Siqi; Lü, Liang; Gao, Jiangang; Yu, Benli; Wu, Si; Zhang, Qijin; Hu, Zhijia

doi:10.1039/d2cp02859j

Cited by 9 publications

(7 citation statements)

References 122 publications

(146 reference statements)

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“…This unique wavelength selectivity arises from the ordered alignment of anisotropic LC molecules. [ 11 ] CLCs present a helicoidal structure with a period equal to half the pitch, denoted as p , which are visualized as 1D PCs. For light propagating along the helical axes, λ 0 correlates with p × n , where λ 0 represents the central wavelength of maximum reflection, and n signifies the average refractive index, derived from ( n e + n o )/2, encompassing the extraordinary ( n e ) and ordinary ( n o ) refractive indices.…”

Section: Introductionmentioning

confidence: 99%

Efficient Fluorescence Utilization and Photon Density of States‐Driven Design of Liquid Crystal Lasers

Qu,

Hu,

et al. 2024

Laser & Photonics Reviews

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Liquid‐crystal random lasers (LCRLs) represent a burgeoning field in soft‐matter photonics, holding promise for ushering in an era of ultrathin, versatile laser sources. Such lasers encompass a multitude of remarkable features, including wide‐band tunability, large coherence area and, in some cases, multidirectional emission. In this paper, an LCRL is developed by doping a laser dye, pyrromethene 597 (PM597), into cholesteric LC, but achieving a wide‐range wavelength‐controllable (560–720 nm) bandgap lasing through voltage control. Bandgap lasing intriguingly occurs in media with extremely low dye gain, which is mainly contributed by the extremely high photon density of states (DOS) at the edge of the LC bandgap. In addition, the utilization rate of the fluorescence spectrum (550–750 nm) of laser dye PM597 is as high as 80%. The multivariate linear regression model is used to characterize the inherent relationship between the lasing intensity emitted by LC and the photon DOS, fluorescence quantum yield, and internal scattering under specific pumping energy. This model shows the potential to predict the critical conditions of laser emission accurately and provides the capability to design and fabricate large‐scale multifunctional responsive photonic crystals using a simple fabrication procedure.

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Section: Introductionmentioning

confidence: 99%

Efficient Fluorescence Utilization and Photon Density of States‐Driven Design of Liquid Crystal Lasers

Qu,

Hu,

et al. 2024

Laser & Photonics Reviews

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“…An object at a temperature higher than absolute zero (0 K) continuously radiates electromagnetic waves into free space, and this phenomenon is known as thermal radiation. 1 Therefore, the ability to control thermal radiation in the near-and far-field is essential for some practical applications, including solar energy harvesting, 2,3 infrared camouflage, 4 spacecraft thermal control devices, 5 near-field radiative heat transfer, 6 and passive daytime radiative cooling. 7 According to Planck's blackbody radiation law, the thermal radiation spectra of most objects are mainly located in the infrared bands.…”

Section: Introductionmentioning

confidence: 99%

A tunable infrared emitter based on phase-changing material GST for visible-infrared compatible camouflage with thermal management

Kang,

Guo,

Guo

2023

Phys. Chem. Chem. Phys.

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“…In recent years, hyperbolic metamaterials (HMMs) have attracted much attention due to its unique electromagnetic wave manipulation properties [23,24]. Typically, HMMs are periodic superpositions of metal and dielectric layers, a structure that allows body waves to propagate between the metal and dielectric layers while supporting surface wave propagation along the metal surface [25].…”

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confidence: 99%

Hyperbolic metamaterials assisted ultrathin Pd films for high-sensitivity hydrogen sensors

Chen,

Wu,

Liu

et al. 2024

Preprint

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Optical hydrogen sensors can use optical fiber as the medium for light transmission or sensing, and realize hydrogen detection based on the relevant physicochemical properties of hydrogen-sensitive materials, which have excellent characteristics such as intrinsic safety, good stability, small size, high specificity, and easy to network. However, traditional hydrogen-sensitive materials such as Pd metal usually require a large thickness to obtain good performance, but this will shorten the service life of the sensor. In response to this issue, a hydrogen sensor based on hyperbolic metamaterials and ultrathin Pd films is proposed. The control of the Pd film thickness to be less than 0.02 μm ensures that mechanical deformation does not occur during the formation of hydrides in the Pd film. The calculations indicate that the sensor sensitivity can be maintained at approximately 2300 even when the thickness of the palladium film is reduced to 0.011 μm. This work provides a promising solution for high-performance optical hydrogen detection, characterized by high sensitivity, low latency, and low cost.

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Liquid crystal random lasers

Abstract: The enthusiasm for research on liquid crystal random lasers (LCRLs) is driven by their unusual optical properties and promising potential for broad applications in manufacturing, communications, medical and entertainment. In...

Cited by 9 publications

References 122 publications

Efficient Fluorescence Utilization and Photon Density of States‐Driven Design of Liquid Crystal Lasers

Efficient Fluorescence Utilization and Photon Density of States‐Driven Design of Liquid Crystal Lasers

A tunable infrared emitter based on phase-changing material GST for visible-infrared compatible camouflage with thermal management

Hyperbolic metamaterials assisted ultrathin Pd films for high-sensitivity hydrogen sensors

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