High efficiency cholesteric liquid crystal lasers with an external stable resonator

Shirvani-Mahdavi, Hamidreza; Fardad, Shima; Mohajerani, Ezeddin; Wu, Shin‐Tson

doi:10.1364/oe.18.013593

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…Liquid crystals, which possess both ordering and fluidity, have shown a rich set of mesophases with unique properties and have demonstrated various applications beyond displays. − In cholesteric liquid crystal (CLC) phases, molecules spontaneously self-assemble into a periodic helical structure with a distinct helical pitch. − When the helical pitch is comparable to the wavelength of visible light, structural color appears due to selective Bragg reflection. − Since the wavelength of selective Bragg reflection depends on the helical pitch, the structural color of CLCs could be tuned in response to various external stimuli, such as mechanical stress, − temperature, electric field, , or light. − The performances of stimuli-triggered responses have intrigued the developments of CLCs for various applications, such as anti-fake materials, − intelligent sensors, − and smart actuators. − …”

Section: Introductionmentioning

confidence: 99%

Mechanochromic Responses of Cholesteric Liquid Crystal Droplets with Nanoscale Periodic Helical Structures Showing Reversible and Tunable Structural Color

Yang

Ruan

et al. 2021

ACS Appl. Polym. Mater.

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Cholesteric liquid crystal (CLC) droplets with nanoscale periodic helical structures are omnidirectional under planar anchoring, and light is selectively reflected from the droplet center at all directions. However, when CLC droplets are too small, random light scattering dominates. In this regard, we present a facile method to increase the selective Bragg reflection of CLC droplets and demonstrate the unique mechanochromic responses of CLC-droplet-dispersed polymer films. The films are originally opaque and white, when the films are bidirectionally stretched, spherical CLC droplets are squeezed into oblate shape and the point defect at the center of each CLC droplet transitions to a ring defect, greatly increasing the selective Bragg reflection region and resulting in the appearance of structural color. By tuning the helical pitches via the chiral dopant concentration from 1.7 to 3.0 wt %, the desired structural color is achieved. Smart sensors show color changes in response to hydration and dehydration are designed, paving the way for the developments of CLC-based functional materials and smart devices.

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Section: Introductionmentioning

confidence: 99%

Mechanochromic Responses of Cholesteric Liquid Crystal Droplets with Nanoscale Periodic Helical Structures Showing Reversible and Tunable Structural Color

Yang

Ruan

et al. 2021

ACS Appl. Polym. Mater.

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“…Lasing in such materials was firstly proposed about 38 years ago [12] and has attracted a widespread attention for its significant efficiency. Since the advent of CLC lasers, extensive research has been carried out to enhance the laser efficiency and reduce the energy threshold [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of combined laser dyes on the efficiency of cholesteric liquid crystal lasers

Shirvani-Mahdavi

Ebrahimi-Azandariani

2019

J Theor Appl Phys

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A high efficiency band-edge cholesteric liquid crystal (CLC) laser comprising an optimal binary-dye mixture (OBD) with 62 wt% DCM and 38 wt% PM597 as the active medium is scrutinized. The measurements indicate that both the fluorescence spectrum width and the order parameter of OBD in the host of nematic liquid crystal (BL009) enhance compared with those for each individual dye. Furthermore, at the fluorescence peak, the optical efficiency of the PM597-doped CLC laser is ~ 1.5× higher than that of DCM, and the laser emission energy for OBD-doped CLC between the wavelengths 595 nm and 613 nm is even higher than that of PM597-doped CLC, so that at the maximum fluorescence of OBD, ≈ 605 nm , the improvement is over 20%.

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Mechanically tunable microlasers based on highly viscous chiral liquid crystals

Shibaev

Crooker

Manevich

et al. 2011

Applied Physics Letters

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Chiral composition is designed for highly viscous lasing microemitters. The composition forms cholesteric liquid crystal and after doping with pyrromethene 597 was used as an active lasing media in stretchable aluminized silicone cavities. Optical pumping of the system led to lasing at the wavelengths defined by a degree of cavity deformation. Lasing thresholds were lower in aluminized cavity than in transparent cavity. A simple model allowing to predict the shift of lasing wavelength as a function of deformation is developed.

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High efficiency cholesteric liquid crystal lasers with an external stable resonator

Cited by 5 publications

References 17 publications

Mechanochromic Responses of Cholesteric Liquid Crystal Droplets with Nanoscale Periodic Helical Structures Showing Reversible and Tunable Structural Color

Mechanochromic Responses of Cholesteric Liquid Crystal Droplets with Nanoscale Periodic Helical Structures Showing Reversible and Tunable Structural Color

Effect of combined laser dyes on the efficiency of cholesteric liquid crystal lasers

Mechanically tunable microlasers based on highly viscous chiral liquid crystals

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