Binary radially-chirped Bragg and graded-index Fresnel fibre lenses for singlemode fibre to photonic crystal coupling

2004 ◽  
Author(s):  
Michael C. Parker ◽  
Makiko Hisatomi ◽  
Stuart D. Walker
Keyword(s):  
Photonic Crystal ◽  
Graded Index

scholarly journals Super-resolution imaging of negative-refractive graded-index photonic crystal flat lens

2021 ◽  
Author(s):  
Binming Liang ◽  
Xiao Huang ◽  
Jihong Zheng
Keyword(s):  
Photonic Crystal ◽  
Imaging System ◽  
Super Resolution ◽  
Point Sources ◽  
Image Resolution ◽  
Multiple Point ◽  
Single Image ◽  
Graded Index ◽  
Resolution Imaging ◽  
Flat Lens

Abstract Photonic crystal (PC) not only breaks through the diffraction limit of traditional lenses but also can realize super-resolution imaging. Improving the resolution is the key task of PC imaging. The main work of this paper is to use a graded-index Photonic crystal (GPC) flat lens to improve the image resolution. An air-hole type two-dimensional (2D) GPC structure based on silicon medium is proposed in this paper. Numerical simulations through RSoft reveal that when the medium in the imaging area is air, the full width at half maximum (FWHM) value of a single image reaches 0.362λ. According to the Rayleigh criterion, the images of two point sources 0.57λ apart can also be distinguished. In the imaging system composed of cedar oil and GPC flat lens, the FWHM value of a single image reaches 0.34λ. In addition, the images of multiple point sources 0.49λ apart can still be distinguished.

A low loss butt-joint connection by using a graded-index photonic crystal fiber

2015 ◽  
Author(s):  
Keiichi Higuchi ◽  
Hirohisa Yokota ◽  
Kazuki Yoneya ◽  
Yoh Imai
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Butt Joint ◽  
Low Loss ◽  
Graded Index ◽  
Crystal Fiber ◽  
Joint Connection

scholarly journals Investigation of 1d Photonic Crystal Based on Nano-porous Silicon Multilayer for Optical Filtering

2011 ◽  
Vol 21 (1) ◽  
pp. 89
Author(s):  
Do Thuy Chi ◽  
Bui Huy ◽  
Nguyen Thuy Van ◽  
Pham Van Hoi
Keyword(s):  
Photonic Crystal ◽  
Porous Silicon ◽  
Interference Filter ◽  
Dielectric Waveguides ◽  
Applied Current ◽  
Reflection And Transmission ◽  
Graded Index ◽  
Current Densities ◽  
1D Photonic Crystal ◽  
Good Agreement

We present the fabrication, simulation, and measurements of 1D photonic crystal based on nano-porous silicon multilayer designed as an optical interference filter. Using electro-chemical etching with timely repeat steps of applied current densities, we fabricated a multilayer structure composed of alternating high- and low-index layer which achieved 90% power reflectivity at wavelength range of 1400-3000 nm. The simulation is relying on the Transfer Matrix Method (TMM) to design and predict the optical properties of nano-porous silicon multilayer as well as the relation between anodization parameters with reflection spectra. The measured reflection and transmission spectra of the nano-porous silicon multilayer show good agreement with simulation. This technique could provide a convenient and economical method to produce filters, cavities, and graded-index dielectric waveguides in the future.

Photonic Crystal Properties of SiON (n=1.56)

2002 ◽  
Vol 722 ◽  
Author(s):  
Igor M.P. Aarts ◽  
Rob W. v.d. Heijden ◽  
Huub W.M. Salemink
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Dielectric Material ◽  
Index Profile ◽  
Graded Index ◽  
Low Dielectric ◽  
Crystal Properties ◽  
Out Of Plane ◽  
Key Factor ◽  
First Time

AbstractWe report for the first time the use of the relatively low index material SiON (n=1.56) for photonic crystal applications. With this system it is possible to enlarge the complete TE-band gap of a 2D-photonic crystal by properly designing the unit cell filling. This may be practically realised because of the larger dimensions of photonic crystals in low index materials, which allows less stringent etch conditions when compared to traditional InP based materials. The optimal distribution of the refractive index is found by placing the displacement field in high or in low dielectric material. The structure is defined by two figures of merit, the width of the band gap and the smallest feature size, which is the key factor in etching the structure. In addition, we suggest the use of a graded-index profile to reduce out of plane scattering. This graded index profile can be realised by controlling the nitrogen flow during deposition of the SiON layer.

scholarly journals Theoretical and experimental investigations of asymmetric light transport in graded index photonic crystal waveguides

2014 ◽  
Vol 104 (3) ◽  
pp. 031116 ◽  
Author(s):  
I. H. Giden ◽  
D. Yilmaz ◽  
M. Turduev ◽  
H. Kurt ◽  
E. Çolak ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Light Transport ◽  
Experimental Investigations ◽  
Photonic Crystal Waveguides ◽  
Graded Index

Investigation of the coupling efficiency between graded index photonic crystal-based flat lenses and various types of waveguides

Pramana ◽  
2021 ◽  
Vol 95 (1) ◽  
Author(s):  
A Gharaati ◽  
Z Zareian ◽  
T Fathollahi Khalkhali
Keyword(s):  
Photonic Crystal ◽  
Coupling Efficiency ◽  
Graded Index

scholarly journals Comprehensive analysis of two different graded-index photonic-crystal lenses

2017 ◽  
Vol 18 (2) ◽  
pp. 109
Author(s):  
A Gharaati ◽  
N Miri
Keyword(s):  
Photonic Crystal ◽  
Comprehensive Analysis ◽  
Graded Index

Gaussian beam-to-slab waveguide coupler by graded index photonic crystal lens

2013 ◽  
Vol 15 (12) ◽  
pp. 125502 ◽  
Author(s):  
B Bahari ◽  
M S Abrishamian
Keyword(s):  
Photonic Crystal ◽  
Gaussian Beam ◽  
Slab Waveguide ◽  
Waveguide Coupler ◽  
Graded Index ◽  
Photonic Crystal Lens

Investigation on Novel Graded-index Plasma Photonic Crystal by Spectroscopy Method

2017 ◽  
Vol 38 (2) ◽  
pp. 232-237
Author(s):  
刘伟波 LIU Wei-bo ◽  
董丽芳 DONG Li-fang
Keyword(s):  
Photonic Crystal ◽  
Spectroscopy Method ◽  
Graded Index ◽  
Plasma Photonic Crystal
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