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Integrated coherent electro-optics

Date: 2018-01-03
Time: 14:30
Venue: 中科院物理研究所M楼236会议室
Speaker: Dr. Mian Zhang

School of Engineering and Applied Sciences, Harvard University

摘要:Controlling light with microwave electrical signals plays a paramount role in a wide range of applications from telecommunication to emerging quantum technologies. Despite the existence of bulk electro-optic modulators for many decades and recent advances in integrate photonics with Si and III-V materials, the direct interaction strength between light and microwave is still extremely weak which severely limits applications. In this talk, I will show you that strong and direct interaction between microwave and light can be achieved on an integrated photonic platform that is robust and scalable. I will introduce our very recent breakthrough on the development of an ultralow loss electro-optics platform using monolithically integrated lithium niobate nanowaveguides. This novel platform possesses three key ingredients that have not coexisted before: 1) Large and linear electro-optic susceptibility (χ2). 2) Efficient co-localization of microwave and light. 3) Extremely low optical loss. I will highlight through experimental progresses in low-Vp modulator, quantum coherent microwave-to-photon interface and microwave driven multi-wavelength oscillator that this unique combination of properties completely shifts the existing paradigm of microwave-optical interfaces and is producing a burst of opportunities for novel electro-optic devices.
[1] Monolithic ultra-high-Q lithium niobate microring resonator, Optica, 4, 1536 (2017)
[2] Efficient quantum microwave-to-optical conversion using electro-optic nanophotonic coupled resonators, Physical Review A, 96, 043808 (2017)
[3] Engineering a diamond spin-qubit with a nano-electro-mechanical system, arXiv:1706.03881, (2017)
[4] On-chip thermo-optic tuning of suspended microresonators, Optics Express, 25, 12109 (2017)
[5] Nanophotonic Lithium Niobate Electro-optic Modulators, arXiv: 1701.06470 (2017)
[6] Quantum Interference between Transverse Spatial Waveguide Modes, Nature Communications 8, 14010 (2017)

Ø  Sep 2015 - now, Harvard University, USA, Postdoctoral Fellow, Advisor: Professor Marko Loncar
Ø  Sep 2009 - Aug 2015, Cornell University, USA, Ph.D. in Applied and Engineering Physics, Advisor: Professor Michal Lipson
Ø  Sep 2005 - Jun 2009, Bristol University, United Kingdom, B.S. in Physics

联系人:李家方 副研究员 (Tel:82649340) 陆凌 研究员 (Tel:82649203)