Fabrication of 3-D alumina photonic bandgap structures by laser rapid prototyping. application to the design of three dimensional photonic crystal resonator antenna

2004 ◽  
Author(s):  
T. Jaffre ◽  
L. Leger ◽  
B. Jecko ◽  
J. Claus ◽  
C. Chaput
Keyword(s):  
Photonic Crystal ◽  
Rapid Prototyping ◽  
Photonic Bandgap ◽  
Three Dimensional ◽  
Dimensional Photonic Crystal ◽  
Crystal Resonator ◽  
Photonic Bandgap Structures

Rapid Prototyping of Ceramic Based Photonic Bandgap Structures

2001 ◽  
Vol 698 ◽  
Author(s):  
Jennifer Synowczynski ◽  
Samuel Hirsch ◽  
Bonnie Gersten
Keyword(s):  
Rapid Prototyping ◽  
Photonic Bandgap ◽  
Three Dimensional ◽  
Polymerization Reaction ◽  
Ceramic Powders ◽  
Thermally Activated ◽  
Solids Loading ◽  
Cad Models ◽  
Poly Ethylene ◽  
Photonic Bandgap Structures

ABSTRACTA three-dimensional photonic bandgap (PBG) structure was fabricated from CAD models using a method based on lost wax rapid prototyping and ceramic gelcasting. The inverse PBG mold was constructed from a low melting point thermoplastic using a high precision Sanders Rapid Toolmaker. An aqueous stable slurry (200-300 cp) containing 50-75wt% of the ceramic powders (BaSrTiO3, MgO), a 15wt% solution of monomer (Methacylamide) and crosslinker (Poly(ethylene glycol) dimethacrylate), and a free radical initiator (2,2'Azobis(2-amidino-propane) dihydrochloride) was cast into the mold. A polymerization reaction was thermally activated at 50°C to immobilize the ceramic powders. The wax mold was then removed by drying the green body in a high humidity oven at 120°C. Scanning Electron Microscopy (SEM) of the unfired part showed that atmosphere hampered the polymerization reaction at the surface of the part. The green density, sintered density, and permittivity all increased as the solids loading increased. In order to optimize the dielectric properties and minimize cracking and warping in the sintered part, the solids loading had to be greater than 80 wt%. This study investigated several steps in the lost mold / gelcasting procedure including stabilizing the ceramic suspension, the correlation between the solids loading and the green and sintered densities, binder removal, and the effect of shrinkage during sintering on the net shape.

Development of 3D Ceramic Photonic Bandgap Structures

2007 ◽  
Vol 280-283 ◽  
pp. 533-536
Author(s):  
Hai Qing Yin ◽  
Soshu Kirihara ◽  
Yoshinari Miyamoto
Keyword(s):  
Band Gap ◽  
Photonic Bandgap ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Cold Isostatic Pressing ◽  
Tio2 Powder ◽  
Lower Range ◽  
Photonic Band Gap Material ◽  
Photonic Bandgap Structures ◽  
Photonic Band

The three-dimensional (3D) photonic band gap material is a material that there exists a full photonic band gap in which waves are forbidden to propagate whatever the polarization or the direction of propagation. In order to obtain photonic bandgap in lower range, we focus on the fabrication of PBG materials of diamond structure with TiO2 powder mixed with SiO2. The inverse epoxy structure with periodic diamond lattices in millimeter order has been fabricated by stereolithographic rapid prototyping. TiO2 slurry was filled into the epoxy structure and then cold isostatic pressing was applied. After sintering at 700K for 5hrs, the epoxy was burnt out and the designed structure was maintained perfectly. The calculated band diagram shows that there exists an absolute photonic band gap for all wave vectors. The measurement of transmission from 10 to 20 GHz in <100> direction shows that a complete band gap is formed at about 14.7-18.5 GHz. The magnitude of the maximum attenuation is as large as 30 dB at 17 GHz.

Enhancement and suppression of thermal emission by a three-dimensional photonic crystal

2000 ◽  
Vol 62 (4) ◽  
pp. R2243-R2246 ◽  
Author(s):  
Shawn-Yu Lin ◽  
J. G. Fleming ◽  
E. Chow ◽  
Jim Bur ◽  
K. K. Choi ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Thermal Emission ◽  
Three Dimensional ◽  
Dimensional Photonic Crystal

Optical Property of Three-Dimensional Photonic Crystal Simulated by Scalar Wave Approximation Method

2013 ◽  
Vol 33 (12) ◽  
pp. 1216004
Author(s):  
赵夺彪 Zhao Duobiao ◽  
蒋袁媛 Jiang Yuanyuan ◽  
单晶 Shan Jing ◽  
王绩伟 Wang Jiwei ◽  
谭天亚 Tan Tianya
Keyword(s):  
Photonic Crystal ◽  
Optical Property ◽  
Approximation Method ◽  
Three Dimensional ◽  
Scalar Wave ◽  
Dimensional Photonic Crystal ◽  
Wave Approximation
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