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Omnidirectional and heat-resistant infrared reflector and method for manufacturing same

A reflector, infrared technology, applied in instruments, mirrors, optical waveguides and light guides, etc., can solve the problems of 2D photonic crystals that cannot have a band gap, and the efficiency of jet propulsion engines is reduced.

Pending Publication Date: 2022-07-12
HRL LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2D photonic crystals cannot have a perfect bandgap
Jet propulsion engines become less efficient as heat is lost through the walls

Method used

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  • Omnidirectional and heat-resistant infrared reflector and method for manufacturing same
  • Omnidirectional and heat-resistant infrared reflector and method for manufacturing same
  • Omnidirectional and heat-resistant infrared reflector and method for manufacturing same

Examples

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example 1

[0154] Example 1: UV-curable carbosilane resins were 3D printed and subsequently pyrolyzed and crystallized into SiC.

[0155] In this Example 1, a commercial carbosilane material was obtained according to this specification and functionalized to make it UV curable. A flat disk of functionalized carbosilane was polymerized via UV curing to produce a flat disk of polycarbosilicate polymer.

[0156] The flat plate of polycarbosilicate polymer was pyrolyzed at 1000°C for 1 hour in an argon atmosphere. The polycarbosilane polymer was then crystallized in an argon atmosphere at 1400°C for 4 hours, resulting in polycrystalline SiC ceramic disks (this SiC material contains less than 10 wt% oxygen).

[0157] Reflectance measurements were performed in a variable angle spectroscopic ellipsometer. Figure 7 Shown are the U and optical constants measured by ellipsometry. exist Figure 7 In , the real (n) and imaginary (k) refractive indices are shown for the 3D printed carbosilane res...

example 2

[0158] Example 2: UV-curable carbosilane resins were 3D printed and subsequently pyrolyzed and crystallized into SiOC.

[0159] In this Example 2, a commercial carbosilane material was obtained according to this specification and functionalized to make it UV curable. use A two-photon lithography tool (Nanoscribe GmbH, Karlsruhe, Germany) 3D printed the starting functionalized carbosilane resin into a wooden stack-shaped polycarbosilane polymer structure. Figure 8 is an SEM image (scale bar = 30 μm) showing a 4 unit cell thick 3D printed wood stack.

[0160] The wood-pile-shaped polycarbosilane polymer structure was subsequently pyrolyzed at a temperature of 1000° C. for 1 hour, at which time the structure was converted to a ceramic material and shrunk by nearly 30% in volume. Figure 9 is a SEM image (scale bar = 30 μm) of a wood-pile-shaped SiOC ceramic material (this SiOC material contains more than 30 wt% oxygen). It is observed that there are multiple layers on top of...

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Abstract

The disclosed structure is configured such that it does not support electromagnetic waves having a frequency within the selected band gap; these electromagnetic waves are thus reflected. Some variations provide an omnidirectional infrared reflector comprising a three-dimensional photonic crystal containing bars of a first material having a first reflectivity, where the bars are arranged to form a plurality of lattice periods in three dimensions, and where the bars are connected at a plurality of nodes; and a second material having a refractive index lower than the first refractive index, wherein the rod is embedded in the second material. The lattice spacing and the rod radius or width are selected for generating a photonic band gap within a selected band of the infrared spectrum. Methods of making and using three-dimensional photonic crystals are described. Applications include thermal barrier coatings and blackbody emission feature control.

Description

[0001] priority data [0002] This International Patent Application claims priority to US Provisional Patent Application No. 62 / 940,294, filed November 26, 2019, and US Patent Application No. 16 / 990,096, filed August 11, 2020, each of which is hereby incorporated by reference References are incorporated herein. [0003] Field of Invention [0004] The present invention generally relates to structures that can reflect infrared light from all directions of incidence. [0005] Background of the Invention [0006] Photonic crystals contain periodic lattices of differing dielectric structures (ie, different refractive indices). Light interacting with the periodic lattice is redistributed into the allowed directions and blocked in the forbidden directions. The forbidden direction is the "photonic band gap" of the photonic crystal. Photonic crystals can be designed with photonic band gaps that prevent light of specific wavelengths and directions from propagating within the photoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122G02B6/12
CPCG02B1/005G02B5/0833G02B5/10
Inventor 崔山婴肖恩·梅尼瀚托拜厄斯·舍德勒裴芳
Owner HRL LAB