Thermal properties of photonic crystals

1D photonic crystal was fabricated in a dichromate-sensitized biopolymer using holography method. The effects of the temperature of the photonic crystal layer on the center of photonic band gaps were studied. We showed that the central wavelength of the band gap can be tuned by heating the photonic crystal layer. By applying such heat treatment, tuning of the position of the band gap for about 80 nm was obtained.

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“…We believe that the shift of the band gap position is due to temperature dependent refractive index of a biopolymer [6].…”

Section: Resultsmentioning

confidence: 89%

Influence of the Heat Treatment on the Band Gaps in the Biopolymer Photonic Crystals

2009

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“…Defect modes wavelength is relative to the structure and thickness of the photonic crystal and the refractive index of the defects. We realize the control of the transmission properties of photonic crystal light waves by changing the refractive index of the defect and can make it into photoelectric device which is tunable [4][5][6][7] . The refractive index of liquid crystal is relatived to temperature, liquid crystal defects are introduced to photonic crystal, when surrounding temperature changes, it makes an impact on defect mode wavelength and leads to the transmission spectrum of one dimensional liquid crystal defect photonic crystal change.…”

Section: Introductionmentioning

confidence: 99%

The Defect Modes Property Controlled by Temperature in One Dimensional Photonic Crystal with Liquid Crystal Defect Layer

Yin

Xie

Wang

et al. 2012

AMR

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The 5CB liquid crystal as defects will be introduced to one dimensional photonic crystal, taking advantage of temperature property of liquid crystal refractive index, the transmission spectrum of one dimensional liquid crystal defect photonic crystal defect modes was researched by the transfer matrix method(TMM). The numerical results indicated that when the temperature went up, one dimensional liquid crystal defect photonic crystal defect modes removed towards the long wavelength. When the temperature increased from 273k to 320k, the defect modes wavelength from 5121nm drifted to 5508nm, the wavelength shift was 387nm and the maximum of temperature sensitivity was 10.85nm/K, it was also observed that the temperature sensitivity decreased as the temperature increased.

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“…On the other hand, the thermal-expansion effect will induce the thickness change of the medium. In this case, the periodic structure of photonic crystals will be destroyed and the band structure will be varied [7] . In this report, the effects of the temperature on the optical propagation property, the band structure, the starting wavelength, the cut-off wavelength and the bandwidths of the first and second band gaps are analyzed in detail.…”

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confidence: 99%

Study on temperature property of band structures in one-dimensional photonic crystals

Kai

Cui

Gao³

et al. 2007

Optoelectron. Lett.

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Using transfer matrix method, the optical transmission properties in one-dimensional (1-D) photonic crystal is analyzed. When the temperature varies, not only the refractive index of the optical medium is changed because of the thermo-optical effect, but also the thickness of the optical medium is changed due to the thermal-expansion effect. Thus, the structure of 1/4 wave-plate stack in original photonic crystal is destroyed and the band structure varies. In this work, the effects of the temperature variation on the first and second band gap in a 1-D photonic crystal are analyzed in detail. It is found that the changes of the starting wavelength, the cut-off wavelength and the forbidden band width depend linearly on the temperature.Photonic crystal is a new type microstructure material in which the permittivities of different materials are spatially periodic. Just like semiconductor, photonic crystal has photon band gap structure [1,2] . Therefore the electromagnetic wave with the frequency in the band gap can not be transmitted [3,4] . This is one of the most basic characteristics of the photonic crystal.Since the photonic crystal can be used to control the propagation of light, its application is extensive including high performance reflector, broadband band stop filter, very narrowband frequency-selective filter, photonic crystal polarizer, photonic crystal microcavity, photonic crystal fiber, photonic crystal laser and so on. These applications are focused on the design and development of optical devices [5,6] . Because the refractive index and period in a photonic crystal is already predetermined during the manufacture, the band structure of the photonic crystal normally does not change. However, when the temperature varies, the refractive index of the medium will be changed due to the thermo-optical effect. On the other hand, the thermal-expansion effect will induce the thickness change of the medium. In this case, the periodic structure of photonic crystals will be destroyed and the band structure will be varied [7] . In this report, the effects of the temperature on the optical propagation property, the band structure, the starting wavelength, the cut-off wavelength and the bandwidths of the first and second band gaps are analyzed in detail.It is well known that the thickness and refractive index of medium can be changed due to the thermal-expansion effect and thermo-optical effect. In certain temperature range, the thermal-expansion effect can be described aswhere d is the thickness, represents the thermal expansion coefficient of medium, and indicates the variation of the temperature. According to the thermo-optical effect, the relation between the temperature and the refractive index can be written as n= n( T )where is the thermo-optic coefficient.

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Thermal properties of photonic crystals

Cited by 7 publications

References 16 publications

Influence of the Heat Treatment on the Band Gaps in the Biopolymer Photonic Crystals

Influence of the Heat Treatment on the Band Gaps in the Biopolymer Photonic Crystals

The Defect Modes Property Controlled by Temperature in One Dimensional Photonic Crystal with Liquid Crystal Defect Layer

Study on temperature property of band structures in one-dimensional photonic crystals

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