Electro-optic effects in blue phases

Дмитриенко, В. Е.

doi:10.1080/02678298908026390

Cited by 55 publications

(18 citation statements)

References 13 publications

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“…This was in agreement with their close examination under R-POM. Similar conclusion was also drawn by Lubin and Hornreich [84] and by Dmitrienko [83] as they derived by minimizing the free energy under the influence of an electric field. Using a dielectrically negative BPLC, Heppke et al had demonstrated an evolution of BPII-monocrystal rotation from 112 h i through 110 h i to 100 h i [71].…”

Section: Expansion Of Temperature Range Of Bpssupporting

confidence: 75%

“…In general, strengthening the applied field would enhance (attenuate) the intensity and blue shift (red shift) the wavelength of BPIII reflection in a dielectrically negative (positive) BPLC [102]. Furthermore, such switching is thousand times faster than the electrostriction in BPI and BPII, tens of millisecond as opposed to tens of seconds [83].…”

Section: Control Of Bp Photonic Bandgapmentioning

confidence: 98%

“…In this regard, 110 h i-oriented BPI crystallites could be acquired by cooling from the 100 h i-oriented BPII [82]. Heating from the planar-textured cholesteric phase to BPI leads to 100 h i-oriented crystallites exhibiting direct reflection from {200} [83]. Using BPLCs with negative dielectric anisotropy, similar cholesteric-BPI transition had been performed isothermally by applying a vertical electric field [78].…”

Section: Expansion Of Temperature Range Of Bpsmentioning

confidence: 99%

“…where γ 1 denotes the rotational viscosity, P is the pitch length and k is the effective elastic coefficient of the system (dominated by the twist deformation coefficient k 22 from Kitzerow et al's derivation [83]). The response time, submilliseconds, is much faster than bulk reorientation of conventional nematics, i.e.…”

Section: Optical Isotropy and Fast Electro-optic Responsementioning

confidence: 99%

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Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Lin

Chen

2015

Anisotropic Nanomaterials

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Blue phase liquid crystals (BPLCs) have attracted considerable attention in recent years owing to their unique periodic structure and electro-optic properties. Besides the potential applications in the next generation display, BPLC with a cubic lattice structure can be regarded as a self-organized three-dimenstional (3D) photonic crystal that can be applied for photonic devices such as optical filter, optical attenuator, phase modulator, laser source and so on. This chapter will introduce the formation of BPLCs from both theoretical and experimental points of view. The stability and temperature range of BPLCs are also discussed followed by its photonic crystal structure, lattice orientation and phase identification. After a basic overview, this chapter will further introduce the applications of BPLCs, including controllability of photonic band gap with external fields, fast electro-optic Kerr effect, and optical nonlinear effect. This short summary shows that the century old intriguing BPLCs have diverse opportunities to offer in modern photonic materials and devices. Moreover, the current challenges in this area are expected to spark innovative ideas leading toward the design and engineering of new chiral materials that may furnish suitable BPLCs to produce advanced photonic materials that have desirable properties and functions.

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Section: Expansion Of Temperature Range Of Bpssupporting

confidence: 75%

Section: Control Of Bp Photonic Bandgapmentioning

confidence: 98%

Section: Expansion Of Temperature Range Of Bpsmentioning

confidence: 99%

Section: Optical Isotropy and Fast Electro-optic Responsementioning

confidence: 99%

See 2 more Smart Citations

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Lin

Chen

2015

Anisotropic Nanomaterials

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“…In contrast to other authors [22,23] who treated field induced orientation, birefringence and biaxiality of BPs theoretically but excluded field-induced phase transitions we are only interested in the latter case. Thus it is the purpose of this section to show that non-linear dielectric effects of higher order are a possible explanation for the reinduction of BP I1 In this equation plo represents the chemical potential without an electric field and E" is the permittivity of a vacuum.…”

Section: Thermodynamic Considerationsmentioning

confidence: 93%

Electric field-induced blue phases in liquid-crystalline systems of high chirality and negative dielectric anisotropy

Spier

Stegemeyer

1991

Liquid Crystals

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Electric field effects on liquid-crystalline blue phases (BP) of high chirality and negative dielectric anisotropy have been studied by polarizing microscopy and reflection spectrometry. Temperature-electric field phase diagrams are presented and selective reflections of different blue phases in electric fields are shown. In systems showing only BPI and BPIII but lacking a zero field BPII an electric field-induced blue phase was observed in the temperature region of BP 111 and was identified as a BPII. IntroductionUp to three liquid-crystalline blue phases can be observed in a small temperature range just below the clearing point in cholesterogenic compounds with sufficiently high chirality [l]. Cubic structures of BP I and BP I1 have been determined with space groups I4,32 (O*) and P4,32 (@), but the structure of BPIII, which exists immediately below the isotropic phase, is still unknown. The BP I11 appears amorphous and until now solely one weak broad selective reflection of polarized light [2] has been observed. Calorimetric measurements [3,4] show that BP I11 is a thermodynamically stable phase; the transition enthalpy BP III/Iso is 50 times larger than those for BP I/BP I1 and BP II/BP 111. This means that the BP 111 structure is more related to BP I1 than to the isotropic phase. Three models attempt to describe the properties of BP 111: the quasicrystal model [5-81, the double twist model [9] and the randomized cubes model [lo, 111. All three models open the possibilities of electric field effects such as fieldinduced orientation and reorientation of BP 111. Additionally field-induced phase transitions starting from BP I11 and resulting in other blue phases only stable in the field could be expected and have been observed by Yang and Crooker as well as by our group [ 12,131. In this paper we show experimentally and theoretically that even in mixtures

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Physical Properties

1999

Physical Properties of Liquid Crystals

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Electro-optic effects in blue phases

Cited by 55 publications

References 13 publications

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Electric field-induced blue phases in liquid-crystalline systems of high chirality and negative dielectric anisotropy

Physical Properties

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