scholarly journals Holographic Fabrication of Three-Dimensional Woodpile-Type Photonic Crystal Templates Using Phase Mask Technique

10.5772/6907 ◽  
2010 ◽  
Author(s):  
Di Xu ◽  
Kevin P. ◽  
Kris Ohlinger ◽  
Yuankun Li
Keyword(s):  
Photonic Crystal ◽  
Three Dimensional ◽  
Phase Mask

scholarly journals Fabrication of two-layer integrated phase mask for single-beam and single-exposure fabrication of three-dimensional photonic crystal

2008 ◽  
Vol 16 (12) ◽  
pp. 9165 ◽  
Author(s):  
Yuankun Lin ◽  
Ahmad Harb ◽  
Daniel Rodriguez ◽  
Karen Lozano ◽  
Di Xu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Three Dimensional ◽  
Phase Mask ◽  
Single Exposure ◽  
Single Beam ◽  
Dimensional Photonic Crystal

Fabrication of two-layer integrated phase mask and single-beam, single exposure fabrication of 3D photonic crystal template using the mask

2008 ◽  
Author(s):  
Yuankun Lin ◽  
Ahmad Harb ◽  
Daniel Rodriguez ◽  
Karen Lozano ◽  
Di Xu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Phase Mask ◽  
Single Exposure ◽  
Single Beam

scholarly journals Partial aperture imaging system based on sparse point spread holograms and nonlinear cross-correlations

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Angika Bulbul ◽  
Joseph Rosen
Keyword(s):  
Structural Changes ◽  
Imaging System ◽  
Current System ◽  
Three Dimensional ◽  
Phase Mask ◽  
Coded Aperture ◽  
Space Telescopes ◽  
Reconstruction Process ◽  
Cross Correlations ◽  
Equivalent Systems

AbstractPartial aperture imaging system (PAIS) is a recently developed concept in which the traditional disc-shaped aperture is replaced by an aperture with a much smaller area and yet its imaging capabilities are comparable to the full aperture systems. Recently PAIS was demonstrated as an indirect incoherent digital three-dimensional imaging technique. Later it was successfully implemented in the study of the synthetic marginal aperture with revolving telescopes (SMART) to provide superresolution with subaperture area that was less than one percent of the area of the full synthetic disc-shaped aperture. In the study of SMART, the concept of PAIS was tested by placing eight coded phase reflectors along the boundary of the full synthetic aperture. In the current study, various improvements of PAIS are tested and its performance is compared with the other equivalent systems. Among the structural changes, we test ring-shaped eight coded phase subapertures with the same area as of the previous circular subapertures, distributed along the boundary of the full disc-shaped aperture. Another change in the current system is the use of coded phase mask with a point response of a sparse dot pattern. The third change is in the reconstruction process in which a nonlinear correlation with optimal parameters is implemented. With the improved image quality, the modified-PAIS can save weight and cost of imaging devices in general and of space telescopes in particular. Experimental results with reflective objects show that the concept of coded aperture extends the limits of classical imaging.

Fabrication of Three-Dimensional Micro-Structures with Two-Photon Absorption by Femtosecond Laser

2006 ◽  
Vol 532-533 ◽  
pp. 568-571
Author(s):  
Ming Zhou ◽  
Hai Feng Yang ◽  
Li Peng Liu ◽  
Lan Cai
Keyword(s):  
Photonic Crystal ◽  
Femtosecond Laser ◽  
Detection System ◽  
Three Dimensional ◽  
Photon Absorption ◽  
Micro Fabrication ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photo Polymerization ◽  
System A

The photo-polymerization induced by Two-Photon Absorption (TPA) is tightly confined in the focus because the efficiency of TPA is proportional to the square of intensity. Three-dimensional (3D) micro-fabrication can be achieved by controlling the movement of the focus. Based on this theory, a system for 3D-micro-fabrication with femtosecond laser is proposed. The system consists of a laser system, a microscope system, a real-time detection system and a 3D-movement system, etc. The precision of micro-machining reaches a level down to 700nm linewidth. The line width was inversely proportional to the fabrication speed, but proportional to laser power and NA. The experiment results were simulated, beam waist of 0.413μm and TPA cross section of 2×10-54cm4s was obtained. While we tried to optimize parameters, we also did some research about its applications. With TPA photo-polymerization by means of our experimental system, 3D photonic crystal of wood-pile structure twelve layers and photonic crystal fiber are manufactured. These results proved that the micro-fabrication system of TPA can not only obtain the resolution down to sub-micron level, but also realize real 3D micro-fabrication.

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

scholarly journals Vertically integrated diffractive gratings on photonic crystal surface emitting lasers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lih-Ren Chen ◽  
Kuo-Bin Hong ◽  
Hsiu-Ling Chen ◽  
Kuan-Chih Huang ◽  
Tien-Chang Lu
Keyword(s):  
Photonic Crystal ◽  
Crystal Surface ◽  
Beam Steering ◽  
Azimuthal Angle ◽  
Three Dimensional ◽  
Grating Period ◽  
Single Chip ◽  
Output Beam ◽  
Optical Elements ◽  
Emitting Lasers

AbstractWe designed and fabricated a photonic crystal surface emitting laser (PCSEL) with vertically integrated diffractive optical elements on their top to study the mechanism of static beam steering on a single chip. The deflected output beam by the self-formed periodic ITO cladding layer of the PCSEL can be further steered by changing the grating period and azimuthal angle of the diffractive gratings relative to the photonic crystal. Through the analysis of photonic band structure and lasing characteristics, the periodic ITO structure is coupled to the photonic crystal band, whereas the integrated grating serves the diffractive function only. The findings pave the way for the design of PCSELs enabling single or multiple output beam with varying direction capability. This type of laser is regarded as an ideal light source for various applications, such as light detection and ranging and three-dimensional sensing systems.

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