Emission Control of Electromagnetic Wave by Using Diamond Photonic Crystals with Graded Lattice Spacing

2003 ◽  
Vol 423-425 ◽  
pp. 785-790 ◽  
Author(s):  
Soshu Kirihara ◽  
Mitsuo Wada Takeda ◽  
Kazuaki Sakoda ◽  
Y. Miyamoto
Keyword(s):  
Electromagnetic Wave ◽  
Photonic Crystals ◽  
Lattice Spacing ◽  
Emission Control ◽  
Graded Lattice

Selective Transmission of Electromagnetic Wave by Using Diamond Photonic Crystals with Graded Lattice Spacing

2006 ◽  
Vol 45 ◽  
pp. 1139-1144
Author(s):  
Soshu Kirihara ◽  
Yoshinari Miyamoto
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Electromagnetic Waves ◽  
Lattice Spacing ◽  
Three Dimensional ◽  
Dielectric Constants ◽  
Microwave Antenna ◽  
Diamond Structure ◽  
Band Calculation ◽  
Graded Lattice

Three-dimensional electromagnetic or photonic crystals with periodic variations of the dielectric constants were fabricated by using a rapid prototyping method called stereolithography. Millimeter-order epoxy lattices with a diamond structure were designed to reflect electromagnetic waves by forming an electromagnetic band gap in GHz range. Titania based ceramic particles were dispersed into the lattice to control the dielectric constant. The diamond lattice structures formed the perfect band gap reflecting electromagnetic waves for all directions. The location of the band gap agreed with the band calculation using the plane wave propagation method. The diamond structures with graded lattice spacing were successfully fabricated as well, resulting in the directional transmission of microwaves. The stretching ratio of the lattice spacing in the crystal structure was changed according to the electromagnetic band calculation. A microwave antenna head composed of the diamond structure with graded lattice spacing was fabricated which achieved the unidirectional transmission.

Fabrication of Metal Photonic Crystals with Graded Lattice Spacing by Using Micro-Stereolithography

2009 ◽  
Vol 631-632 ◽  
pp. 287-292 ◽  
Author(s):  
Daisuke Sano ◽  
Soshu Kirihara
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Time Domain ◽  
Lattice Spacing ◽  
Pure Copper ◽  
Sintering Process ◽  
Micro Scale ◽  
Transmission Properties ◽  
Graded Lattice ◽  
Thz Waves

We designed micro-scale photonic crystal with or without graded lattice spacing composed of copper to control Terahertz (THz) waves. Designed structures were fabricated by using micro-stereolithography. By proper dewaxing and sintering process, pure copper photonic crystals were obtained. Transmission properties of THz waves propagating through the photonic crystals were measured by THz time-domain spectroscopy. Measured results showed good agreements with the simulated results.

Colloidal photonic crystals with a graded lattice-constant distribution

2007 ◽  
Vol 285 (9) ◽  
pp. 1037-1041 ◽  
Author(s):  
Jian Li ◽  
Longjian Xue ◽  
Zhe Wang ◽  
Yanchun Han
Keyword(s):  
Photonic Crystals ◽  
Lattice Constant ◽  
Colloidal Photonic Crystals ◽  
Graded Lattice ◽  
Constant Distribution

Terahertz Wave Properties of Ceramic Photonic Crystals with Graded Structure Fabricated by Using Micro-Stereolithography

2009 ◽  
Vol 631-632 ◽  
pp. 299-304 ◽  
Author(s):  
Soshu Kirihara ◽  
Toshiki Niki ◽  
Masaru Kaneko
Keyword(s):  
Electromagnetic Wave ◽  
Photonic Crystals ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Expansion Method ◽  
Terahertz Wave ◽  
Diamond Structure ◽  
Terahertz Time Domain Spectroscopy ◽  
3D Cad ◽  
Wave Properties

Fabrication and terahertz wave properties of alumina micro photonic crystals with a diamond structure were investigated. The three-dimensional diamond structure was designed on a computer using 3D-CAD software. Acrylic diamond structures with alumina particles dispersion were formed by using micro-stereolithography. Fabricated precursors were dewaxed and sintered in the air. The electromagnetic wave properties were measured by terahertz time-domain spectroscopy. A complete photonic band gap was observed at the frequency range from 0.40 to 0.47 THz, and showed good agreement with the simulation results calculated by the plane wave expansion method. Moreover, a localized mode was obtained by introducing a plane defect between twinned diamond structures. The one-way transmission of the electromagnetic wave was realized by using this twinned photonic crystal with the graded diamond structure. They corresponded to the simulation by the transmission line modeling (TLM) method.

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