Ranjith Rajasekharan Unnithan

3-D Printed Planar Dielectric Linear-to-Circular Polarization Conversion and Beam-Shaping Lenses Using Coding Polarizer

J Zhu, Y Yang, D McGloin, R Rajasekharan Unnithan, S Li, S Liao, Q Xue

Journal article  |  2020  |  IEEE Transactions on Antennas and Propagation

This article presents a new linear-to-circular polarization conversion coding unit, on which two new kinds of beam-shaping lenses ..

A single sensor based multispectral imaging camera using a narrow spectral band color mosaic integrated on the monochrome CMOS image sensor

Xin He, Yajing Liu, Kumar Ganesan, Arman Ahnood, Paul Beckett, Fatima Eftekhari, Dan Smith, Md Hemayet Uddin, Efstratios Skafidas, Ampalavanapillai Nirmalathas, Ranjith Rajasekharan Unnithan

Journal article  |  2020  |  APL Photonics

A multispectral image camera captures image data within specific wavelength ranges in narrow wavelength bands across the electroma..

Hybrid Color Filters for Multispectral Imaging

X He, Y Liu, P Beckett, MH Uddin, A Nirmalathas, RR Unnithan

Journal article  |  2020  |  Advanced Theory and Simulations

Multispectral cameras capture images in multiple wavelengths in narrow spectral bands. They offer advanced sensing well beyond nor..

Fully Solution-Processed Transparent Artificial Neural Network Using Drop-On-Demand Electrohydrodynamic Printing

J Yong, Y Liang, Y Yu, B Hassan, MS Hossain, K Ganesan, RR Unnithan, R Evans, G Egan, G Chana, B Nasr, E Skafidas

Journal article  |  2019  |  ACS Applied Materials & Interfaces

© 2019 American Chemical Society. Artificial neural networks (ANN), deep learning, and neuromorphic systems are exciting new proce..

Plasmonic Narrow Bandpass Filters Based on Metal-Dielectric-Metal for Multispectral Imaging

X He, N O'keefe, D Sun, Y Liu, H Uddin, A Nirmalathas, RR Unnithan

Conference Proceedings  |  2019  |  CLEO Pacific Rim Conference

© 2018 OSA. This paper presents a novel plasmonic filter design to reduce the full width half maximum (FWHM) of transmission spect..

High-dimensional Stokes vector direct detection over few-mode fibers

Honglin Ji, Di Che, Chuanbowen Sun, Jian Fang, Giovanni Milione, Ranjith Rajasekharan Unnithan, William Shieh

Journal article  |  2019  |  Optics Letters

Direct detection attracts much attention for its simplicity compared with coherent detection. In this Letter, we propose for the f..

Nanoscale Materials and Devices for Future Communication Networks

Miao Sun, Mohammad TAHA, Sumeet Walia, Madhu Bhaskaran, Sharath Sriram, William Shieh, Ranjith Rajasekharan Unnithan

Book Chapter  |  2019

There is an ever-increasing demand in bandwidth and data rate in optical communications, internet, sensing, computing, machine lea..

Tuning of Plasmonic Resonances in the Near Infrared Spectrum Using a Double Coaxial Aperture Array

Miao Sun, Omid Kavehei, Paul Beckett, Ann Robert, William Shieh, Ranjith Rajeskharan Unnithan

Journal article  |  2018  |  IEEE Photonics Journal

Transmission Enhancement in Coaxial Hole Array Based Plasmonic Color Filter for Image Sensor Applications

Xin He, Nicholas O'Keefe, Yajing Liu, Dechuan Sun, Hemayet Uddin, Ampalavanapillai Nirmalathas, Ranjith Rajasekharan Unnithan

Journal article  |  2018  |  IEEE Photonics Journal

A Photonic Switch Based on a Hybrid Combination of Metallic Nanoholes and Phase-change Vanadium Dioxide

Miao Sun, Mohammad Taha, Sumeet Walia, Madhu Bhaskaran, Sharath Sriram, William Shieh, Ranjith Rajasekharan Unnithan

Journal article  |  2018  |  Scientific Reports