Highly-anisotropic liquid-crystal mixtures for tunable microwave devices

Weil, C.; Müller, Stefan; Scheele, P.; Best, P.; Lüssem, G.; Jakoby, Rolf

doi:10.1049/el:20031150

Cited by 70 publications

(37 citation statements)

References 5 publications

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“…Nematic liquid crystals are uni-axial, characterized by refractive indices n and the n ⊥ , for light polarization parallel and orthogonal to the director axis, respectively. The magnitude of nematic birefringence Δn = n − n ⊥ is among the largest of all known materials, on the order of 0.2 that holds from the visible through far infrared and well into the microwave regime [1][2][3][41][42][43][44][45][46][47][48], c.f. Figure 3 and Table 1.…”

Section: F Figures 2(a)-(b)mentioning

confidence: 99%

“…Figure 3 and Table 1. NLC with birefringence approaching unity in the visible regime are now routinely being produced [47,48], and there are increasing efforts to synthesize NLC with large birefringence and low loss in the Terahertz and longer wavelength regime [41][42][43][44][45][46] paralleling the growth in interests in developing tunable electromagnetic devices.…”

Section: F Figures 2(a)-(b)mentioning

confidence: 99%

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MULTIPLE TIME SCALES OPTICAL NONLINEARITIES OF LIQUID CRYSTALS FOR OPTICAL-TERAHERTZ-MICROWAVE APPLICATIONS (Invited Review)

Khoo¹,

Zhao²

2014

PIER

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Abstract-We provide a critical account of the dynamics of laser induced refractive index changing mechanisms in nematic liquid crystals which may be useful for all-optical switching and modulation applications in the visible as well as the Terahertz and long-wavelength regime. In particular, the magnitude and response times of optical Kerr effects associated with director axis reorientation, thermal and order parameter changes, coupled flow-reorientation effects and individual molecular electronic responses are thoroughly investigated and documented, along with exemplary experimental demonstrations. Emphases are placed on identifying parameter sets that will enable all-optical switching with much faster response times compared to their conventional electro-optics counterparts.

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Section: F Figures 2(a)-(b)mentioning

confidence: 99%

Section: F Figures 2(a)-(b)mentioning

confidence: 99%

MULTIPLE TIME SCALES OPTICAL NONLINEARITIES OF LIQUID CRYSTALS FOR OPTICAL-TERAHERTZ-MICROWAVE APPLICATIONS (Invited Review)

Khoo¹,

Zhao²

2014

PIER

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“…The larger anisotropies at 30GHz are in line with previous findings in pure LC. [2] In the 1-4GHz experiment, the LC orientation is controlled by an electric field. In order to avoid electrophoretic damage, we restricted the maximum value of the electric field with the consequence that full reorientation of the LC director may not have been achieved.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…In comparison with the existing candidate materials such as ferroelectric ceramics, liquid crystals (LC) have drawn attention in recent years because of lower losses at microwave frequencies and comparatively high anisotropy. [1][2][3] LCs can be loaded with various types of nanoparticles for enhanced performance. Anisotropic particles make particularly interesting additives because they may align with the anisotropic host and further enhance its anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Dielectric anisotropy of nematic liquid crystals loaded with carbon nanotubes in microwave range

et al. 2010

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“…Their anisotropy and sensitivity to external fields have led to numerous display and nondisplay applications. Moreover, LCs are very promising materials at microwave [1][2][3][4][5][6][7][8] and terahertz (THz) frequencies [9][10][11][12][13] due to low losses and comparatively high anisotropy. LCs are particularly suitable for operation at frequencies beyond 10 GHz as the dielectric loss decreases with increasing frequency [14], making them attractive for phase modulating devices.…”

Section: Introductionmentioning

confidence: 99%

Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal

Trushkevych

et al. 2010

Appl. Opt.

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(2010) Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal. Applied Optics, 49 (28). pp. 5212-5216. Permanent WRAP URL:http://wrap.warwick.ac.uk/92169 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher's statement:© 2010 Optical Society of America]. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription.

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Highly-anisotropic liquid-crystal mixtures for tunable microwave devices

Cited by 70 publications

References 5 publications

MULTIPLE TIME SCALES OPTICAL NONLINEARITIES OF LIQUID CRYSTALS FOR OPTICAL-TERAHERTZ-MICROWAVE APPLICATIONS (Invited Review)

MULTIPLE TIME SCALES OPTICAL NONLINEARITIES OF LIQUID CRYSTALS FOR OPTICAL-TERAHERTZ-MICROWAVE APPLICATIONS (Invited Review)

Dielectric anisotropy of nematic liquid crystals loaded with carbon nanotubes in microwave range

Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal

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