We introduce the new concept of "metalines" for manipulating amplitude and phase profile an incident wave locally independently. Thanks to highly confined graphene plasmons, a transmit-array graphene-based metalines is used realize analog computing on ultra-compact, integrable, planar platform. By employing general concepts spatial Fourier transformation, well-designed structure such meta-transmit-array, combined with graded index (GRIN) lenses, can perform two mathematical operations, i.e.,...

We propose an unprecedented transmit-array configuration which can mold the incident beam by modulating phase and amplitude wavefronts. The is composed of patterned graphene metasurfaces as shunt admittance sheets. Thanks to exceptional features such tunability, thinness, low loss, high confinement plasmons, proposed subwavelength structure passes strict touchstones for nano-photonic opto-electronic applications. Two flat-optics functionalities, i.e., focusing splitting, are realized means...

Multistatic millimeter-wave imaging structures are superior to their monostatic counterparts for natural objects of sudden profile variations. image reconstruction is conventionally performed via synthetic aperture radar (SAR)-based methods which, in spite high accuracy, computationally burdensome. On the other side, Fourier-based multistatic systems also faces few challenges including multidimensional interpolation, a plane-wave approximation spherical waves, and k-space partitioning. This...

In this paper, we introduce a modified optical integrator based on suitably designed metamaterial blocks. The integration is performed an impinging wave pattern as it propagates through these So far, various metamaterial-based integrators have been implemented with appropriate performance in the case of zero-DC input signals. However, suffer from low accuracy when fed by signals rich low-frequency contents. latter property arises truncation contents Fourier domain. To solve shortcoming,...

A novel super-resolution volumetric photoacoustic microscopy, based on the theory of structured-illumination, is proposed in this paper. The structured-illumination will be introduced order to surpass diffraction limit a microscopy (PAM) structure. Through optical excitation targeted object with sinusoidal spatial fringe pattern, object's frequency spectrum forced shift domain. shifting desired direction leads passage high-frequency contents through passband acoustic response. Finally,...

This paper proposes a new non-isolated, interleaved, high step-up, soft-switching converter for renewable energy applications. The proposed is boost topology designed to have continuous input current with low ripple. It employs no auxiliary circuit or extra switches achieve soft-switching, and the voltage stress on power reduced. By using transformer's leakage inductance, diodes' reverse recovery problem tackled without need an snubber circuit. has been analyzed compared similar topologies....

In a photoacoustic (PA) imaging system, the detectors are bandwidth-limited. Therefore, they capture PA signals with some unwanted ripples. This limitation degrades resolution/contrast and induces sidelobes artifacts in reconstructed images along axial direction. To compensate for limited bandwidth effect, we present signal restoration algorithm, where mask is designed to extract at absorber positions remove improves resolution contrast image. The restored can be considered as input of...

This paper focuses on an ef?cient approach of designing multi-static arrays for millimeter-wave imaging, based the k-space or Fourier-spatial domain characteristic imaging systems. Our goal is to decrease redundancy data measured by each antenna, and improve resolution reconstructed image. The proposed technique determining role transmitter receiver, in collecting from voxel target then rotating transmitters' beams measure desirable information. effect non-uniform redundant frequency samples...

The concept of three-dimensional (3D) resolvability an integral imaging system is thoroughly investigated in this research. general 3D resolution fails to describe the discrimination completely. Then concepts depth-resolution plane and lateral-resolution are introduced show difference between conventional spatial newly resolvability. Therefore, different properties these planes for differentiating lateral variations axial analyzed paper. theoretical statements demonstrated experimentally.

A resolution-improved active millimeter-wave (MMW) imaging structure, based on the theory of structured illumination, is proposed in this paper. The illumination a well-defined concept for surpassing diffraction limit optical microscopy, where imposing grating patterns targeted object could help moving frequency spectrum along desired direction spatial domain. This shift helps passing different parts object's through filter. combination resultant images provides framework to pass wider band...

The seemingly inherent deficiencies of integral imaging systems-in particular, the depth field limitation-are, in this Letter, partly resolved by using an irregular lens array, where each is either rotated or displaced from its original position conventional flat array. It shown that having array lenses system has some sort redundancy could be exploited to improve quality image formation. needed rotation displacement constituent found a meticulous optimization algorithm, which tries evenly...

This paper presents an optical processing approach for exploring a large number of genome sequences. Specifically, we propose correlator global alignment and extended moiré matching technique local analysis spatially coded DNA, whose output is fed to novel three-dimensional artificial neural network DNA alignment. All-optical implementation the proposed 3D developed its accuracy verified in Zemax. Thanks parallel capability, structure performs 4 million sequences 150 base pairs few seconds,...

Observing and studying the evolution of rare non-repetitive natural phenomena such as optical rogue waves or dynamic chemical processes in living cells is a crucial necessity for developing science technologies relating to them. One indispensable technique investigating these fast evolutions temporal imaging systems. However, just conventional spatial systems are incapable capturing depth information three-dimensional scene, typical also lack this ability retrieve information—different...

In this paper, the relationship between position of ultrasound transducers from photoacoustic source and reconstructed image is investigated. Our studies have shown that distance transducer its location specifically affects closely related to quality source. Also, we introduce a concept called blind angle for computed tomography (PACT) planar or circular limited-view geometry. Complete accurate equations are presented in paper all different 2D geometries. The main these spherically wave...

Circular photoacoustic tomography (C-PAT) arrangements are widely used in PAT systems. Many algorithms proposed for to reconstruct images such as delay and sum (DAS), universal back-projection (UBP), etc., all suffering from their own disadvantages. In this paper, overcome these limitations, we a fast uniform adapted (ADAS) filtered (F-ADAS) detectors with finite infinite bandwidth, respectively. Moreover, the edge uniformity index (EUI) metric was quantitative evaluation. Two cases 1)...

Among different transducer configurations of a photoacoustic (PA) imaging system, limited-view (e.g., planar and circular configurations) have more clinical applications. On the other hand, generated PA wave is bipolar. Therefore, qualifying physiological parameters would be challenging, especially in configuration. To tackle this issue, paper unipolar back-projection reconstruction algorithm presented. The proposed method uses initial signals derivatives to reconstruct image. numerical...

Reducing the number of acoustic detectors in a circular-view photoacoustic imaging system leads to cost reduction and increased efficiency. But reducing results appearing more streak artifacts reconstructed image. In this paper suppress artifacts, we proposed an artifact removal factor. The factor is combination edge detection image filter standard deviation that applied back-projected signals. To evaluate performance method, reduced transducers fifth minimum required number. Numerical have...

This brief introduces a modified backprojection algorithm to compensate the effect of redundancy captured data in spatial-fourier or k-space domain for multistatic millimeter-wave imaging. The measured by each transmitter-receiver pair is explained and redundancies are determined. Such act as an undesirable filter that distorts appearance resulting image. Our goal modify SAR address this problem, where extensive simulation experimental results also provided. measurements show significant...