91 citations · 349 across the 24 of their papers we have counts for
25 papers
Purcell Enhancement of Spontaneous Emission of a Quantum Emitter on a Waveguide
Sushma Gali, Komal Sharma, Jaydeep Kumar Basu +1
We investigate the effect of a waveguide on an emitter spontaneous emission in its vicinity. The impact of various possible orientations of an emitter with respect to the waveguide…
DFT analysis and demonstration of enhanced clamped Electro-Optic tensor by strain engineering in PZT
Suraj, Shankar Kumar Selvaraja
We report 400\% enhancement in PZT Pockels coefficient on DFT simulation of lattice strain due to phonon mode softening.The simulation showed a relation between the rumpli…
3-D poling and drive mechanism for high-speed PZT-on-SOI Electro-Optic modulator using remote Pt buffered growth
Suraj, Shankar Kumar Selvaraja
In this work, we have demonstrated a novel method to increase the electro-optic interaction in an intensity modulator at the C-band by optimizing the growth methodology of PZT with…
Highly Oriented PZT Platform for Polarization-Independent Photonic Integrated Circuit and Enhanced Efficiency Electro-Optic Modulation
Suraj, Shankar Kumar Selvaraja
We demonstrate, for the first time, sputtered PZT as a platform for the development of Si-based photonic devices such as rings, MZI, and electro-optic modulators. We report the opt…
Polarization Independent Grating in GaN-on-Sapphire Photonic Integrated Circuit
Suraj, Shashwat Rathkanthiwar, Srinivasan Raghavan +1
In this work, we report the realization of a polarization-insensitive grating coupler, single-mode waveguide, and ring resonator in the GaN-on-Sapphire platform. We provide a detai…
Sputter-deposited PZT-on-Silicon Optimization for C-band Electro-Optic Modulation
Suraj, Shankar Kumar Selvaraja
Ferroelectric materials exhibit interesting electric, mechanical and optical properties. Particularly,tin-film lead zirconium titanate (PZT) has been used as a standard piezo-elect…
Sandwiched Hybrid Waveguide Platform for Integrated Photonics Application
Rahul K Dash, Shankar Kumar Selvaraja
We propose and demonstrate a hybrid waveguide platform using layered amorphous silicon and silicon nitride. The waveguide offers more degrees of freedom to design waveguides with d…
On-Chip Chemical Sensing Using Double-slot Silicon Waveguide
Sushma Gali, Akshay Keloth, Shankar Kumar Selvaraja
In this paper, we present refractive index measurement using a double-slot silicon waveguide-based Mach Zehnder interferometer. We present a double-slot waveguide that offers the b…
Linear and Nonlinear Characterization of broadband integrated Si-rich silicon nitride racetrack ring resonator for on-chip applications
Partha Mondal, Venkatachalam P, Radhakant Singh +3
We demonstrate the linear and nonlinear characterization of plasma-enhanced chemical vapor deposited silicon-rich silicon nitride (SRSN) racetrack ring resonator for on-chip applic…
Independently reconfigurable internal loss and resonance-shift in an interferometer-embedded optical cavity
Aneesh Dash, Viphretuo Mere, S. K. Selvaraja +1
Optical cavities find diverse uses in lasers, frequency combs, optomechanics, and optical signal processors. Complete reconfigurability of the resonant frequency as well as the los…
Compact Ring Resonator Enhanced Silicon-MSM Photodetector in SiN-on-SOI Platform
Avijit Chatterjee, Saumitra Sam, Sujit Kumar Sikdar +1
We present a compact on-chip resonator enhanced silicon-MSM photodetector in wavelength band for communication and lab-on-chip bio-sensing applications. We report the hi…
Alignment Tolerant Broadband Compact Taper for Low-Loss Coupling to a Silicon-on-Insulator Photonic Wire Waveguide
Purnima Sethi, Shankar Kumar Selvaraja
We experimentally demonstrate a broadband, fabrication tolerant, CMOS compatible compact silicon waveguide taper (34.2 um) in silicon-on-insulator wire waveguides. The taper works…
Mitigation of carrier induced optical bistability in silicon ring resonators
Vadivukkarasi Jeyaselvan, Shankar Kumar Selvaraja
We present a detailed study of electrical and optical generated free carrier on the spectral characteristics of a silicon microring modulator. The spectral distortion generated due…
High-speed waveguide integrated silicon photodetector on a SiN-SOI platform for short reach datacom
Avijit Chatterjee, Saumitra, Sujit Kumar Sikdar +1
We present waveguide integrated high-speed Si photodetector integrated with silicon nitride (SiN) waveguide on SOI platform for short reach data communication in 850 nm wavelength…
Generation of tunable, high repetition rate optical frequency combs using on-chip silicon modulators
Kp Nagarjun, Vadivukarassi Jeyaselvan, Shankar Kumar Selvaraja +1
We experimentally demonstrate tunable, highly-stable frequency combs with high repetition-rates using a single, charge injection based silicon PN modulator. In this work, we demons…
On-Chip Optical Transduction Scheme for Graphene Nano-Electro-Mechanical Systems in Silicon-Photonic Platform
Aneesh Dash, S. K. Selvaraja, A. K. Naik
We present a scheme for on-chip optical transduction of strain and displacement of Graphene-based Nano-Electro-Mechanical Systems (NEMS). A detailed numerical study on the feasibil…
Compact Broadband Low-Loss Taper for Coupling to a Silicon Nitride Photonic Wire
Purnima Sethi, Rakshitha Kallege, Anubhab Haldar +1
We demonstrate an ultra-compact waveguide taper in Silicon Nitride platform. The proposed taper provides a coupling-efficiency of 95% at a length of 19.5 um in comparison to the st…
All-optical wavelength multicasting in quadruple resonance-split coupled Silicon microring cavity
Awanish Pandey, Shankar Kumar Selvaraja
We demonstrate an all-optical four-channel wavelength multicasting in a coupled Silicon microring resonator system. The scheme is based on two-photon absorption induced free carrie…
Efficient and Tunable Strip-to-Slot Fundamental Mode Coupling
Viphretuo Mere, Rakshitha Kallega, Shankar Kumar Selvaraja
We present a novel photonic wire-to-slot waveguide coupler in SOI. The phase matching between a wire and slot mode is achieved using a mode transformer. The architecture consists o…
Thermo-optic coefficient measurement of liquids using silicon photonic microring resonators
Prashanth R Prasad, Shankar K Selvaraja, Manoj Varma
On-chip measurement of thermo-optic coefficient (TOC) of samples along with on-chip temperature measurements can be used to compensate for thermal fluctuation induced noise in refr…
High-efficiency broad-bandwidth sub-wavelength grating based fibre-chip coupler in SOI
Siddharth Nambiar, Shankar Kumar Selvaraja
We report a comprehensive study on the performance of uniform and non-uniform based subwavelength grating couplers in Silicon-on-Insulator. The two performance metrics, coupling ef…
Tunable coupling-induced resonance splitting in self-coupled Silicon ring cavity with robust spectral characteristics
Awanish Pandey, Shankar Kumar Selvaraja
We propose and demonstrate a self-coupled microring resonator for resonance splitting by mutual mode coupling of cavity mode and counter-propagating mode in Silicon-on-Insulator pl…
Ultra-compact low-loss broadband waveguide taper in silicon-on-insulator
Purnima Sethi, Anubhab Haldar, Shankar Selvaraja
A novel design of large bandwidth, fabrication tolerant, CMOS-compatible compact tapers (15 um) have been proposed and experimentally demonstrated in silicon-on-insulator. The prop…
Generation of correlated photons in hydrogenated amorphous-silicon waveguides
S. Clemmen, A. Perret, S. K. Selvaraja +5
We report the first (to our knowledge) observation of correlated photon emission in hydrogenated amorphous- silicon waveguides. We compare this to photon generation in crystalline…