Zobrazeno 1 - 10
of 235
pro vyhledávání: '"Selvaraja, Shankar Kumar"'
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 surface is studied through simulations and compared with experimental
Externí odkaz:
http://arxiv.org/abs/2407.06592
DFT analysis and demonstration of enhanced clamped Electro-Optic tensor by strain engineering in PZT
Autor:
Suraj, Selvaraja, Shankar Kumar
We report $\approx$400\% enhancement in PZT Pockels coefficient on DFT simulation of lattice strain due to phonon mode softening.The simulation showed a relation between the rumpling and the Pockels coefficient divergence that happens at -8\% and 25\
Externí odkaz:
http://arxiv.org/abs/2305.19226
Autor:
Suraj, Selvaraja, Shankar Kumar
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 the metal (Ti/Pt) as a base material and the PZT poling architecture.
Externí odkaz:
http://arxiv.org/abs/2305.19174
Autor:
Suraj, Selvaraja, Shankar Kumar
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 optimization of PZT on MgO(002) substrate to obtain highly oriented PZT f
Externí odkaz:
http://arxiv.org/abs/2305.19126
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 detailed demonstration of the material characterization, device simulation,
Externí odkaz:
http://arxiv.org/abs/2305.15900
Autor:
Suraj, Selvaraja, Shankar Kumar
Ferroelectric materials exhibit interesting electric, mechanical and optical properties. Particularly,tin-film lead zirconium titanate (PZT) has been used as a standard piezo-electric material in micro-electro-mechanical systems. Interestingly, it ha
Externí odkaz:
http://arxiv.org/abs/2305.13263
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 desired confinement, effective index and polarization birefringence. Un
Externí odkaz:
http://arxiv.org/abs/2304.00748
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 best sensitivity and limit of detection compared to wire and single-slo
Externí odkaz:
http://arxiv.org/abs/2302.04474
Publikováno v:
In Optics Communications 1 January 2024 550
We present a compact on-chip resonator enhanced silicon-MSM photodetector in $850$ $nm$ wavelength band for communication and lab-on-chip bio-sensing applications. We report the highest responsivity of 0.81 A/W for a 5 $\mu m$ long device. High respo
Externí odkaz:
http://arxiv.org/abs/2007.05024