Tunable omnidirectional reflection bands and defect modes of a one-dimensional photonic band gap structure with liquid crystals

Ha, Young-Ki; Yang, Yi; Kim, J.-E.; Park, H. Y.; Kee, Chul‐Sik; Lim, H.; Lee, J.-C.

doi:10.1063/1.1381414

Cited by 105 publications

(26 citation statements)

References 12 publications

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“…Recently, due to the realization of a metamaterial with negative refractive index (NRI) predicted by Veselago [17], defect layer using NRI materials are also available [18][19][20]. In addition, by making use of an electro-optical nonlinear defect, the device can become tunable [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Properties of Defect Modes in One-Dimensional Photonic Crystals

Wang

2010

PIER

110

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Abstract-A theoretical analysis of the properties of the defect modes in a one-dimensional defective photonic crystal (PC) is given. Two defective PCs stacked in symmetric and asymmetric geometries are considered. The defect modes are investigated by the calculated wavelength-dependent transmittance for both TE and TM waves. It is found that there exists a single defect mode within the photonic band gap (PBG) in the asymmetric PC. There are, however, two defect modes within the PBG in the symmetric one. The dependences of defect modes on the angle of incidence are illustrated. Additionally, the effect of defect thickness on the number of defect modes is also examined.

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Section: Introductionmentioning

confidence: 99%

Properties of Defect Modes in One-Dimensional Photonic Crystals

Wang

2010

PIER

110

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“…For a 1D PC with alternating layers of Si and a nematic LC, Chigrin et al [17] showed that an applied voltage can produce switching of the transmitted light; this is realized due to the Freedericksz phase transition which consists in the alignment of the nematic LC molecules parallel to a (sufficiently large) electric field. For the same type or structure, Ha et al [18] demonstrated that it is possible to tune a complete PB gap-for both TE and TM polarizations. Bush and John [19] considered a synthetic inverse opal whose voids are infiltrated with a nematic LC.…”

Section: Introductionmentioning

confidence: 98%

Two-dimensional photonic crystal infiltrated by liquid crystal: response to applied electric field

2003

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We have calculated the photonic band structure of a 2D photonic crystal whose empty cylinders are infiltrated by a liquid crystal; a D.C. electric field is applied in the direction parallel to the cylinders. The local dielectric constant within the cylinders is obtained by minimizing the free energy, which has elastic and electrostatic contributions. We have assumed strong anchoring of the molecules of the nematic liquid crystal at the cylinder boundaries and have averaged over the cross-sectional area of the cylinder. The resulting dielectric tensor is diagonal and depends on the applied field. Moreover, it has the same symmetry as a uniaxial material, so that the optical response of the H-modes and E-modes is given by different dielectric constants ("ordinary" and "extraordinary"). The photonic band structures exhibit a notable dependence on the applied field with shifts up to 6% of the bands. For the E-modes, with a careful choice of the filling fraction it is possible to design a complete photonic gap for a certain range of electric fields, and close the gap for other values of the field. Such behaviour could be applied to optical tuning, switching, and polarizing of light.

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“…Tuning of the ODR bands opens a means for control of the wave. 18 Although many models and approaches have been developed to study temperature effects of the band structure of PnCs, a similar study for the acoustic ODR bands, which would be of help in the design and optimization of thermal tuning of omnidirectional acoustic mirrors, has not been thoroughly investigated. Moreover, recent work has highlighted the potential of omnidirectional and tunable acoustic device using acoustic metamaterials.…”

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confidence: 99%

Thermal tuning of omnidirectional reflection bands in one-dimensional finite phononic crystals

Chen

2015

Journal of Applied Physics

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This study investigates the temperature-tuned omnidirectional reflection (ODR) bands in a one-dimensional (1D) finite phononic crystal (PnC), formed by alternating layers of nitinol and epoxy. An analytical model, based on the transfer matrix method, is developed to study reflection and transmission characteristics of the acoustic waves including shear and compressional waves in a 1D PnC. Existence criteria and the sensitive and continuous temperature-tunability of ODR bands in the nitinol/epoxy PnC are demonstrated using the analyses of projected-band structures and reflection spectra. The width and location of the ODR bands shift markedly with temperature variations of nitinol across the phase transition from martensite to austenite. The effects of temperature, filling fraction of nitinol layers, and the Si clad layer on ODR bands are considered. The results will be of benefit in the design and optimization of thermal tuning of omnidirectional acoustic mirrors.

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Tunable omnidirectional reflection bands and defect modes of a one-dimensional photonic band gap structure with liquid crystals

Cited by 105 publications

References 12 publications

Properties of Defect Modes in One-Dimensional Photonic Crystals

Properties of Defect Modes in One-Dimensional Photonic Crystals

Two-dimensional photonic crystal infiltrated by liquid crystal: response to applied electric field

Thermal tuning of omnidirectional reflection bands in one-dimensional finite phononic crystals

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