Oğuz Tolga Çelik

I am a sixth-year PhD student in Electrical Engineering at Stanford University, advised by Amir Safavi-Naeini. I received my MS degree from Stanford University in June 2022 and my BS degree from Bilkent University in June 2019, both in Electrical Engineering.

My main research interests are integrated optics, quantum nonlinear optics and nanophotonics. I am working on the design, fabrication and characterization of electro-optic modulators for visible and near infrared (450-780 nm) light. The goal of my project is to make scalable, high speed controllers (>GHz) for neutral atom experiments through photonic integrated circuits designed for visible light.

otcelik [at] stanford [dot] edu

Selected Work

Bias-Stable Blue Light Modulators

We study the temperature and optical power dependence of the half-wave voltage in electro-optic blue light modulators in thin film lithium niobate, and show that the choice of electrode material plays a critical role in maintaining stable DC bias.
Roles of temperature, materials, and domain inversion in high-performance, low-bias-drift thin film lithium niobate blue light modulators

780 nm Electro-Optic Modulator

780 nm electro-optic intensity modulator: RF probe delivers electric field inducing a refractive index perturbation through the electro-optic effect in thin film lithium niobate. Optical fibers couple light in and out of waveguides through grating couplers.

High-bandwidth CMOS-voltage-level electro-optic modulation of 780 nm light in thin-film lithium niobate

EO modulation results. (a) Waveguide gap sweep comparison with simulated and measured switching voltage. (b) Experiment setup. (c) Electro-optic tuning curve. (d) Open-circuit frequency response.

Publications

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