Polarization-independent and super broadband flat lens composed of graded index annular photonic crystals

2019 ◽  
Vol 435 ◽  
pp. 202-211 ◽  
Author(s):  
T. Fathollahi Khalkhali ◽  
M. Alipour-Beyraghi ◽  
M. Lalenejad ◽  
A. Bananej
Keyword(s):  
Photonic Crystals ◽  
Graded Index ◽  
Flat Lens ◽  
Polarization Independent

Polarization-independent and tunable flat lenses based on graded index two-dimensional photonic crystals

2018 ◽  
Vol 420 ◽  
pp. 133-140 ◽  
Author(s):  
M. Alipour-Beyraghi ◽  
T. Fathollahi Khalkhali ◽  
A. Bananej ◽  
J. Mostafavi-Amjad
Keyword(s):  
Photonic Crystals ◽  
Two Dimensional ◽  
Graded Index ◽  
Polarization Independent

scholarly journals NEGATIVE REFRACTION AND SUBWAVELENGTH FOCUSING USING PHOTONIC CRYSTALS

2004 ◽  
Vol 18 (25) ◽  
pp. 1275-1291 ◽  
Author(s):  
EKMEL OZBAY ◽  
KAAN GUVEN ◽  
ERTUGRUL CUBUKCU ◽  
KORAY AYDIN ◽  
B. KAMIL ALICI
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Negative Refraction ◽  
Numerical Study ◽  
Effective Index ◽  
Index Of Refraction ◽  
Far Field ◽  
Two Dimensional ◽  
Flat Lens ◽  
Effective Index Of Refraction

In this article, we present an experimental and numerical study of novel optical properties of two-dimensional dielectric photonic crystals (PCs) which exhibit negative refraction. We investigate two mechanisms which utilize the band structure of the PC to generate a negative effective index of refraction (n eff <0) and demonstrate the negative refraction experimentally. To the isotropic extend of n eff , different PC slab structures are employed to focus the radiation of a point source. It is shown experimentally that the PC can generate an image of the source with subwavelength resolution in the vicinity of the PC interface. Using a different PC, one can also obtain a far field focusing. In the latter case, we explicitly show the flat lens behavior of the structure. These examples indicate that PC-based lenses can surpass limitations of conventional lenses and lead to novel optics applications.

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.

Metallic graded photonic crystals for graded index lens

2012 ◽  
Vol 109 (4) ◽  
pp. 1071-1074 ◽  
Author(s):  
Fabian Gaufillet ◽  
Éric Akmansoy
Keyword(s):  
Photonic Crystals ◽  
Graded Index
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