One-dimensional metal photon dielectric crystal and its design method and application

A metal medium, photonic crystal technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as restricting applications and complex photonic crystal structures.

Inactive Publication Date: 2009-05-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the reported photonic crystal structures with this property are very complicated, which requires very high experimental preparation technology, and the structure can only realize the absorption of electromagnetic waves with a single polarization or a single wavelength.
Therefore greatly restricted its application (Engineering the structure-induced enhanced absorption in three-dimensionalmetallic photonic crystals, Phys.Rev.E 70,066611,2004)

Method used

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  • One-dimensional metal photon dielectric crystal and its design method and application
  • One-dimensional metal photon dielectric crystal and its design method and application
  • One-dimensional metal photon dielectric crystal and its design method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0023] figure 1 It shows the absorption characteristic diagram of the one-dimensional metal dielectric photonic crystal using the fifth-generation Fibonacci quasi-periodic sequence, which can realize wide incident angle and broadband high absorption. The structure adopts F 5 =(DMDMDDMD) S , where D is n D =1.38 materials (such as SiO 2 ), d D =180nm, M is metal tungsten, d M =10 nm, S=3. figure 1 (a) shows that the spectral band width with an absorption rate above 90% covers a wide frequency band from 0.745 μm to 1.708 μm, and the total thickness is 2.79 μm. figure 1 (b) shows that the high absorption edge of dual-polarized light is almost unchanged in the range of incident angles from 0° to 50°, indicating that the structure has a wide range of angles and can basically meet the needs of large-angle incident angles.

Embodiment 2

[0025] figure 2 It shows the absorption spectrum diagram of the seventh-generation Fibonacci quasi-periodic one-dimensional metal dielectric photonic crystal, which can realize wide incident angle and broadband high absorption. The structure adopts F 7 =(DMDMDDMDMDDMDDMDMDDMD) S , where S=1, and other parameters are the same as in Example 1. figure 2 It shows that the band width with the absorption rate above 99% covers the frequency band with the center wavelength of 1 μm and the bandwidth from 0.868 μm to 1.133 μm, and the total thickness is 3.07 μm. For the two polarization states of transverse electric mode and transverse magnetic mode, the angle applicable range of the absorption property is 0-50°, which can basically meet the requirement of large-angle incidence.

Embodiment 3

[0027] image 3 It shows the absorption spectrum diagram of the Thue-Morse quasi-periodic one-dimensional metal dielectric photonic crystal to achieve broadband and high absorption at wide incident angles. The structure adopts TM 5 =(DMMDMDDMMDDMDMMDMDDMDMMDDMMDMDDM) S , where D is n D = 2.67 materials (such as GaN), d D =80nm, M is metal chromium, d M = 10 nm. S=1. image 3 It shows that the spectral band width with the absorption rate above 95% covers the frequency band with the center wavelength of 1.024 μm and the bandwidth from 0.817 μm to 1.23 μm, and the total thickness is 1.44 μm. For the two polarization states of transverse electric mode and transverse magnetic mode, the angle applicable range of the absorption property is 0-60°, which can basically meet the requirement of large-angle incidence.

[0028] Embodiments 1 to 3 are examples of structural design of a wide incident angle broadband high absorption one-dimensional metal dielectric photonic crystal. Th...

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Abstract

The invention relates to a one-dimension metal medium photon crystal, wherein the membrane is formed by metal layer at special thickness and medium layer at special arrangement; said special thickness is same as the metal skin depth; the special arrangement is period structure and quasi-period structure. The invention has high-adsorption band width, adsorption rate, and angle application range decided by the material factors of medium and metal, geometry thickness and repeated unit period number; said parameters based on the demands of adsorption working wavelength range and adsorption rate are selected. The invention has wide incidence angle, wide band, and high adsorption rate to be used to increase adsorption membrane of wideband laser energy meter or power meter receiver; and the narrow-band adsorption type can be used in laser welding or other areas. The invention has simple production and wide application.

Description

technical field [0001] The present invention relates to metal medium photonic crystal technology, in particular to one-dimensional metal medium photonic crystal and its design method and application. Background technique [0002] The research on metal-dielectric photonic crystals has become an important international frontier research, and one of the hot spots is to find structures that achieve high absorption characteristics in specific wavelength bands. At present, the reported photonic crystal structures with this property are very complex, which requires very high experimental preparation technology, and the structure can only realize the absorption of electromagnetic waves with a single polarization or a single wavelength. Therefore greatly restricted its application (Engineering the structure-induced enhanced absorption in three-dimensionalmetallic photonic crystals, Phys. Rev. E 70, 066611, 2004). The fabrication technology of one-dimensional metal dielectric photoni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/00
Inventor 汪河洲董建文
Owner SUN YAT SEN UNIV
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