Light controllable tuning and switching of lasing in chiral liquid crystals

Shibaev, Petr; Sanford, R. Lea; Chiappetta, Daniel; Milner,; Genack, Azriel Z.; Bobrovsky, Alexey

doi:10.1364/opex.13.002358

Cited by 78 publications

(51 citation statements)

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“…Since the publication of this work, there have appeared a number of papers concerned with phototunable CLC [33][34][35][36][37]. In [36,37], the reversible tuning was performed using a trans-cis photoisomerization of the chiral azo component of a cholesteric liquid-crystal mixture.…”

Section: Light Tunable Dddfb Clc Lasersmentioning

confidence: 99%

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Different Approaches of Employing Cholesteric Liquid Crystals in Dye Lasers

Chilaya¹,

Chanishvili²,

Petriashvili³

et al. 2011

MSA

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Section: Light Tunable Dddfb Clc Lasersmentioning

confidence: 99%

“…In [36,37], the reversible tuning was performed using a trans-cis photoisomerization of the chiral azo component of a cholesteric liquid-crystal mixture. Lin et al [37] achieved a change in the helical pitch up to 110 nm through exposure to light from an ultraviolet lamp for 20 min.…”

Section: Light Tunable Dddfb Clc Lasersmentioning

confidence: 99%

Different Approaches of Employing Cholesteric Liquid Crystals in Dye Lasers

Chilaya¹,

Chanishvili²,

Petriashvili³

et al. 2011

MSA

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show abstract

“…In previous reports, different types of LCssuch as nematic LCs (NLCs) [8][9][10], cholesteric LCs (CLCs) [11][12][13], and polymer-dispersed LCs (PDLCs) [14]-have been used as scattering media to investigate RL characteristics. Meanwhile, LCs have been considered for use as the host materials in RLs, because they can be easily modulated by external factors such as temperature [15][16][17], electric fields [18][19][20], and light fields [21,22]. Yoshida et al [23] studied a wavelength-swept lasing system produced from a single freestanding film.…”

Section: Introductionmentioning

confidence: 99%

Band-gap-tailored random laser

Xing

Wei

et al. 2018

Photon. Res.

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A band-gap-tailored random laser with a wide tunable range and low threshold through infrared radiation is demonstrated. When fluorescent dyes are doped into the liquid crystal and heavily doped chiral agent system, we demonstrate a wavelength tuning random laser instead of a side-band laser, which is caused by the combined effect of multi-scattering of liquid crystal (LC) and band-gap control. Through rotating the infrared absorbing material on the side of the LC cell, an adjustable range for random lasing of 80 nm by infrared light irradiation was observed.

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“…These molecules can be dissolved in the cholesteric mixture, where they act as molecular switches by inducing changes in the chirality of the whole system upon irradiation with UV light. [6][7][8] In recent reports, reversible light-controlled lasing has been achieved by the trans-cis photoisomerization of chiral azodopants. [6,7] In these publications, the azobenzene is a structural part of the chiral molecules.…”

mentioning

confidence: 99%

“…[6][7][8] In recent reports, reversible light-controlled lasing has been achieved by the trans-cis photoisomerization of chiral azodopants. [6,7] In these publications, the azobenzene is a structural part of the chiral molecules. Under UV (350 nm) irradiation, rod-shaped trans molecules are transformed into bent cis molecules.…”

mentioning

confidence: 99%

Reversible Tuning of Lasing in Cholesteric Liquid Crystals Controlled by Light‐Emitting Diodes

et al. 2007

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The light-controlled tuning of cholesteric liquid crystal (CLC) lasers has attracted considerable interest over the last few years because of the possibility of developing tunable chiral mirrorless lasers emitting over a wide range of wavelengths. It is expected that these laser sources will be easily tunable because of the high sensitivity of the helical pitch of CLCs to external fields. Several different approaches for changing the helical pitch have been proposed, such as changing the chiral dopant concentration, varying the temperature, and applying an external voltage. However, particular attention has been paid to controlling the helical pitch using light in order to build an optically tunable system. [1][2][3][4][5][6][7] After the first report on phototunable lasing in dye-doped CLCs, [1] where this possibility was demonstrated by exploiting the phototransformation of the chiral dopant based on a photo-Fries mechanism, [2] several other reports have also been published. [3][4][5][6][7] Using photo-Fries processes, these novel approaches offer the possibility of extending the irreversible tuning range to ca. 40 nm, [1] based on huge pitch variations that can be larger than 400 nm. [1,8] However, in the original case, as in the method reported by Fuh et al., [4] the irreversibility of the photoinduced processes significantly narrows the possible applications of these systems. In order to achieve fully controllable and reversible laser tuning, novel effective compounds and mechanisms for controlling the pitch are required. One possibility is to use chiral and achiral photochromic azobenzene derivatives. These molecules can be dissolved in the cholesteric mixture, where they act as molecular switches by inducing changes in the chirality of the whole system upon irradiation with UV light. [6][7][8] In recent reports, reversible light-controlled lasing has been achieved by the trans-cis photoisomerization of chiral azodopants. [6,7] In these publications, the azobenzene is a structural part of the chiral molecules. Under UV (350 nm) irradiation, rod-shaped trans molecules are transformed into bent cis molecules. This transformation alters the twisting power of the chiral dopants, inducing helical changes in the cholesteric matrix, and therefore shifting the selective reflection band (SRB). Shibaev et al. [6] have reported a rapid shift of the lasing wavelength (by ca. 40 nm) and position of the SRB after 2 min of low-power UV irradiation; relaxation back to the initial lasing wavelength and SRB position takes about 20 min. A larger change of pitch (up to 110 nm) has been reported by Lin et al. [7] after 20 min of UV irradiation; relaxation to the initial state takes a much longer time in this case (about 20 h). Azobenzene materials also appear to be very attractive for other applications: several reports not related to lasing have been published pertaining to investigations of a wide variety of novel mixtures of chiral and achiral azobenzene derivatives. Several different experimental efforts in the literature ...

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Light controllable tuning and switching of lasing in chiral liquid crystals

Cited by 78 publications

References 0 publications

Different Approaches of Employing Cholesteric Liquid Crystals in Dye Lasers

Different Approaches of Employing Cholesteric Liquid Crystals in Dye Lasers

Band-gap-tailored random laser

Reversible Tuning of Lasing in Cholesteric Liquid Crystals Controlled by Light‐Emitting Diodes

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