Observation of Electro-Optical Effects in Blue Phase Systems

Heppke, G.; Krumrey, Michael; Oestreicher, F.

doi:10.1080/00268948308072031

Cited by 69 publications

(33 citation statements)

References 13 publications

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“…In this paper the electro-optic and elasto-optic properties of BPs are discussed. Our theoretical results are compared with the observed field-induced effects in BPs such as the orientation of monocrystals [4,71, the shifts of the Bragg reflections [4,8,91 and the birefringence [4, 10-121.…”

Section: Introductionmentioning

confidence: 89%

“…The same result is also obvious from equation (2) directly: if the deformation ulm is fixed (that is, the average molecular configuration is fixed), the sign of the deformation-induced A C ,~ is determined by the sign of the molecular dielectric anisotropy. These simple arguments explain the different signs of the shifts of the same reflections in the BPs with different signs of x1 [4,8,91. (2) and (1) we obtain the dielectric susceptibility and the free energy as functions of E:…”

Section: Phenomenological Descriptionmentioning

confidence: 99%

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Electro-optic effects in blue phases

Дмитриенко

1989

Liquid Crystals

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A theory of electro-optic and elasto-optic effects in the blue phases of cholesteric liquid crystals is developed. The case of small structure deformations and a weak field is considered: ]El < E,, where E, is the critical field for the cholesteric-nematic transition. The theory explains all of the main experimental facts: the field-induced birefringence and biaxiality, the distortion of the cubic structure (electrostriction) and the orientation of the blue phase monocrystals in an electric field.

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Section: Introductionmentioning

confidence: 89%

Section: Phenomenological Descriptionmentioning

confidence: 99%

Electro-optic effects in blue phases

Дмитриенко

1989

Liquid Crystals

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“…This effect involves diffusion of molecules (flow reorientation), which in turn gives rise to noticeable and continuous change of crystal structure. Heppke et al were the first to demonstrate electrostriction in cubic BPs [99]. Together with field-induced phase transition, they also presented the evolution of change in selective reflection from blue (BPII) through green (BPI) to red (BPI).…”

Section: Control Of Bp Photonic Bandgapmentioning

confidence: 94%

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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“…Because of the optical activity [1,11] of BPs the molecules are arranged helically in these phases too so that an electric field effect on the BP structure should be expected. Attempts to study the phase transition in BPs in the presence of an electric field are known [12][13][14]. The aim of this paper is to detect a distor tion of the cubic BP structure by application of an electric field.…”

Section: Introductionmentioning

confidence: 99%