A5041550802- Advanced Photonic Communication Systems
- Microwave Engineering and Waveguides
- Photonic and Optical Devices
- Millimeter-Wave Propagation and Modeling
- Radio Frequency Integrated Circuit Design
- Antenna Design and Analysis
- Advanced Optical Sensing Technologies
- Advanced Fiber Laser Technologies
- Sparse and Compressive Sensing Techniques
- Microwave Imaging and Scattering Analysis
- Semiconductor Lasers and Optical Devices
- Medical Imaging Techniques and Applications
- Ultra-Wideband Communications Technology
- Endometrial and Cervical Cancer Treatments
- Prostate Cancer Diagnosis and Treatment
- Prostate Cancer Treatment and Research
- Nonlinear Optical Materials Research
- Advanced X-ray Imaging Techniques
- Spectroscopy and Chemometric Analyses
- Statistical Methods in Clinical Trials
- Advanced X-ray and CT Imaging
- Optical Coherence Tomography Applications
- Colorectal and Anal Carcinomas
- Optical and Acousto-Optic Technologies
- Sarcoma Diagnosis and Treatment
Loyola University Medical Center
2025
Loyola University Chicago
2023-2025
University of Delaware
2013-2018
The densification of cellular networks and their soon-to-increase operational frequency is forcing new topological considerations in 5G networks. In particular, that enable extreme spatial discrimination are being considered as a means to significantly increase data capacity by realizing spatial-spectral channels offer reuse without co-channel or adjacent-channel interference. this paper, we present approach such capability based on optically upconverted, spatially coherent phased-array feed...
We present a novel optical feeding technique to achieve efficient excitation of an ultrawideband-connected array (CA) antenna. The passive fiber optic feed allows for preservation the theoretical bandwidth and low profile elementary connected dipole elements. In order improve effective radiated power, high-power charge compensated modified unitravelling carrier photodiodes are integrated into antenna first time. Circuit full-wave simulations, which include all required components, conducted...
Emerging systems requiring large-scale manufacture and monolithic integration of photonic components have created demand for inexpensive scalable processes the production conformal, low-drive voltage, high bandwidth EO modulators. This paper discusses a device architecture phase modulator based on recently developed organic material, IKD-1-50, using low-index, photocurable cladding layers Silicon platform. Theory modeling TM waveguide electrode configuration are presented, followed by...
A low-profile optically fed ultra-wideband-connected array (CA) antenna with increased operational power is presented. Introduction of a miniature optical prism into the fiber optic feed enables an efficient 90° coupling to high-power charge-compensated-modified uni-travelling carrier photodiode connected directly at point integrated CA element. This technique significantly reduces profile and, herein, implemented 1-D consisting eight photodiode-coupled active dipole elements. The...
A 2D distributed-aperture imaging system paired with a newly developed modality, k-space tomography, is presented for detection of radio waves' frequency and angle arrival in azimuthal elevation directions through coherent optical processing. This technique uses fiber-length dispersion conjunction distributed antenna array to provide unique spatio-temporally encoded charge-coupled device (CCD)-captured interferograms, from which computational tomographic reconstruction the RF signal...
We present the first demonstration of a tightly coupled array (TCA) excited by high-power photodiodes directly integrated onto antenna substrate. As complex electrical feed network is not required to radiating elements, design can realize ultra-wide bandwidth while improving upon size, weight, and power conventional electronic-based arrays. Circuit full-wave simulations are conducted for optimization performance compared against all-electronic TCA designs within literature. A prototype 9 ×...
A high-power charge-compensated modified uni-travelling carrier photodetector is directly integrated into an aperture coupled patch antenna. The coupling technique offers not only good isolation between feed and radiating substrates but also wide operational bandwidth. antenna developed to operate at 22 GHz with 3-dB relative bandwidth of ~20%, over which the measured effective isotropic radiated power approaches 31 dBm. photonic a lightweight, low form factor fiber-optic that demonstrates...
The coherent optical processing technique, referred to as k-space tomography, enables simultaneous detection of radio waves' frequency and angle arrival. As with the majority signals, spatial spectral distribution RF signals in electromagnetic environment is sparse nature. This inherent characteristic provides an ideal opportunity merge this imaging modality compressive sensing techniques. Compressive has set a foundation for data acquisition from small amount data. By adapting specific...
High-power, high-linearity CC-MUTC photodiodes, directly integrated into connected and tightly coupled array antennas enable ultra-wideband (UWB) phased operation with improved size, weight, power (SWaP). Presented is high-fidelity beam steering bandwidth performance of several these one-dimensional photodiode-integrated antenna arrays.
A Kalman filter is applied to the k-space tomography imaging modality for state-space prediction of radio frequency (RF) sources. By seeding Kaczmarz computed algorithm with filtered predictions, spatial-spectral reconstruction RF environment accelerated. This technique enables an N/M decrease in time, where M standard number iterations required fully reconstruct image and N when seeded a correct input.
Modern RF antenna systems are being asked to address many simultaneous and pressing challenges, e.g., wide operational bandwidth, dynamic gain patterns, conformal profiles. One way these problems is develop a low profile ultra-wideband (UWB) phased array antenna. However, the design, fabrication, integration of such an using all-RF feed exceedingly difficult. Thus, in this paper we present novel optical feeding technique achieve efficient excitation UWB connected (CA) By optically,...
Direct integration of high power, linearity photodiodes with a UWB phased connected array antenna to form low profile, transmit aperture is presented. This proximal optical-to-electrical conversion leverages advantages photonic feeding techniques and design flexibility for effective beam steering.
You have accessJournal of UrologyProstate Cancer: Localized: Radiation Therapy (PD57)1 May 2024PD57-08 RADIATION THERAPY VS. SURGERY FOR PROSTATE CANCER: AN UPDATED SYSTEMATIC REVIEW OF CLINICAL TRIALS Lauren Marie Hekman, Athena Barrett, Dylan Ross, Eli Palaganas, Prashanth Giridhar, Thiraviyam Elumalai, Pragathee V, Alec Block, James Welsh, Sashank Saini, Soumyajit Roy, BhanuPrasad Venkatesulu, and Abhishek Solanki HekmanLauren Hekman , BarrettAthena Barrett RossDylan Ross PalaganasEli...
Millimeter-wave (mmW) imaging receivers have demonstrated the ability to sense radio-frequency (RF) waves using traditional phased antenna array techniques, and, through a coherent photonic up-conversion process, image these free-space optical systems. Building upon idea of up-conversion, k-space tomography extends functionality millimeter-wave receiver as two-dimensional spatial processing unit three-dimensional sensing with addition frequency detection. In this configuration, an arrayed...
Organic EO materials, sometimes called polymers, offer a variety of very promising properties that have improved at remarkable rates over the last decade, and will continue to improve. However, these materials rely on "poling" process afford activity, which is commonly cited as bottleneck for widespread implementation organic material-containing devices. The Solution Phase-Assisted Reorientation Chromophores (SPARC) utilizes mobility chromophores in solution phase acentric molecular order...
A method is presented for simultaneous detection of radio waves' frequency and angle arrival through coherent optical processing. This technique uses fiber length dispersion paired with a distributed antenna array, providing unique CCD-captured interference patterns computational tomographic reconstruction the RF signal environment.
An all polymer EO modulator with a simple fabrication process using commercially available cladding materials has been designed, fabricated, and characterized. The result is low V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">π</inf> that capable of being scaled up to larger scale production. Continued work on this project made towards designing an amplitude structure developing traveling wave transmission line electrodes will utilize the...
We have built and tested a soft X-ray/XUV imaging camera that uses thinned, back-illuminated, all-buried channel RCA CCD for radiation sensing. The is slow-scan device which allows frame integration if necessary. detection characterics of the been over 15-1500 eV range. response was linear with exposure up to ~0.2-0.4 erg/cm<sup>2</sup>; saturation occurred greater exposures. Attempts resolve single photons energies 1.5 keV are described.
A technique for the spatial-spectral analysis of cellular environment by performing a near real-time imaging k-space is presented. The system uses random dispersion map from an optically-upconverted RF phased array receiver and tomographic reconstruction techniques to recover source scene. While spatial inherent antennas, temporal introduced randomizing fiber length each up-converted antenna element, which contains received signal as sideband on optical carrier. Each routed into common...
Simultaneous detection of radio waves' frequency and angle arrival is achieved by coherent optical processing. This technique uses a fiber length dispersion array coupled to distributed antenna provide unique CCD-captured interferograms for computational tomographic reconstruction the signal environment.