scholarly journals Flat lens design using phase correction technique for horn antenna applications

2021 ◽  
Vol 19 (1) ◽  
pp. 213
Author(s):  
Nur Hazimah Syazana Abdul Razak ◽  
Nur Shahira Mat Hussain ◽  
Nurul Hazlina Noordin ◽  
Syamimi Mardiah Shaharum ◽  
Ahmad Syahiman Mohd Shah ◽  
...  
Keyword(s):  
Horn Antenna ◽  
Phase Correction ◽  
Lens Design ◽  
Correction Technique ◽  
Flat Lens

Aberration-free flat lens design for a wide range of incident angles

2016 ◽  
Vol 33 (2) ◽  
pp. A66 ◽  
Author(s):  
Arnold Kalvach ◽  
Zsolt Szabó
Keyword(s):  
Lens Design ◽  
Wide Range ◽  
Flat Lens

A New Concept for a Flat Lens Design Using Dielectric Cylinders

2017 ◽  
Vol 65 (11) ◽  
pp. 5720-5731 ◽  
Author(s):  
Eran Falek ◽  
Reuven Shavit
Keyword(s):  
Lens Design ◽  
Flat Lens

Fourier-Domain Analysis of Complex Line Shapes

1989 ◽  
Vol 43 (1) ◽  
pp. 38-44 ◽  
Author(s):  
J. M. Bostick ◽  
L. A. Carreira
Keyword(s):  
Phase Correction ◽  
Fourier Domain ◽  
Phase Information ◽  
Line Shapes ◽  
Target Spectrum ◽  
Correction Technique ◽  
Subsequent Phase ◽  
Domain Phase ◽  
Anti Stokes ◽  
Previous Phase

The development of a method of phase correction is discussed. Previous phase-correction methods have often required the input of an operator in order to extract phase information from the target spectrum. The use of this Fourier-domain phase-correction technique is discussed specifically in terms of its application to coherent anti-Stokes Raman spectra. The extraction of phase information and subsequent phase correction are discussed.

Phase Aberration Correction in Two Dimensions Using a Deformable Array Transducer

1995 ◽  
Vol 17 (3) ◽  
pp. 227-247
Author(s):  
Loriann L. Ries ◽  
Stephen W. Smith
Keyword(s):  
Adaptive Optics ◽  
Ultrasonic Transducer ◽  
Phase Correction ◽  
Two Dimensions ◽  
Ultrasound Images ◽  
Two Dimensional ◽  
Ultrasound Beam ◽  
Dimensional Array ◽  
Electronic Phase ◽  
Correction Technique

Phase aberrations due to tissue inhomogeneities degrade medical ultrasound images by disrupting the ultrasound beam focus. Currently, phase correction algorithms are implemented by adjusting the electronic phase delays used to steer and focus the ultrasound beam. This means that a two-dimensional array is necessary to completely correct two-dimensional aberrations in tissue. However, two-dimensional arrays are a complex option due to their large number of elements and poor sensitivity. Instead of using a full two-dimensional array, a new technique is proposed, similar to one used in adaptive optics, which uses a deformable transducer of significantly fewer channels for two-dimensional phase correction. Phase correction in azimuth is achieved by altering the electronic phase delay of the element. However, phase correction in elevation is achieved by tilting the element in elevation with a piezoelectric actuator. Comparison of simulations of the new phase correction transducer versus the conventional phase correction technique have shown that a deformable 1 × N or 2 × N transducer can approach the image quality of a 4 × N two-dimensional array or greater. A prototype 1 times 32 array with eight low frequency piezoelectric actuators has been constructed such that every four ultrasonic transducer elements in azimuth are mounted on one independently controlled actuator. This prototype transducer was used to test the ability of a deformable array to produce real time phased array scans and to simulate on-line phase correction by tilting the elements in the elevation direction.

Frequency Tunable Phononic Crystal Flat Lens for Subwavelength Imaging

2021 ◽  
Author(s):  
Hrishikesh Danawe ◽  
Serife Tol
Keyword(s):  
Negative Refraction ◽  
Phononic Crystal ◽  
Ultrasonic Inspection ◽  
Aluminum Plate ◽  
Lens Design ◽  
Lattice Arrangement ◽  
Dispersion Branch ◽  
Small Spot ◽  
Flat Lens ◽  
Frequency Tunable

Abstract In this paper, we present a thickness-contrast based flat lens for subwavelenth imaging in an aluminum plate. The lens is made of phononic crystal (PC) with a triangular lattice arrangement of through holes drilled over an aluminum plate. Subwave-length imaging is achieved by exploiting the concept of negative refraction of A0 plate mode for the optical dispersion branch of the PC. The wavenumbers are matched at a design frequency by creating a step change in the thickness of the PC-lens and host plate. The thickness-contrast results in refractive index of minus one at the interface of the lens and host plate. Negative refraction-based lens overcomes the diffraction limit and enables focusing of flexural waves in an area less than a square wavelength. We validate the flat lens design at a single design frequency through numerical simulations and experiments. Further, we numerically demonstrate the tunability of the lens design over a broadband frequency range by modifying the thickness-contrast between the lens and host plate. The proposed frequency tunable design is promising for many applications such as ultrasonic inspection, tetherless energy transfer, and energy harvesting, where the localization of wave energy in a small spot is desirable.

High speed and low side lobe optical phased array steering by phase correction technique

2013 ◽  
Author(s):  
Yadong Jin ◽  
Aimin Yan ◽  
Zhijuan Hu ◽  
Zhenyu Zhao ◽  
Wangzhou Shi
Keyword(s):  
High Speed ◽  
Phased Array ◽  
Side Lobe ◽  
Phase Correction ◽  
Correction Technique ◽  
Optical Phased Array
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