OSC Colloquium: Dr. Sunil Bhave

    Thursday, January 30, 2020 - 3:30pm - 5:00pm
    Meinel 307

    1630 E. University Blvd.

    3rd Floor Lobby area


    Open to campus and public.


    Speaker: Sunil Bhave

    Topic: “PORT: Piezoelectric Optical Resonance Tuner”

    Host: Felipe Guzman 

    Visit our website for future lecture dates and speaker information: http://www.optics.arizona.edu/news-events/events/colloquium For a list of our archived lectures: http://www.optics.arizona.edu/news-events/events/colloquium/archive


    Silicon Nitride lacks second order optical non-linearity making it difficult to modulate. Traditionally thermal heaters are used to tune and trim silicon nitride optical resonators, but they are limited by thermal time constants and consume DC power. In this talk I will demonstrate tuning of silicon nitride resonators by integrating a piezoelectric MEMS actuator. Such a stress-optical effect achieves high speed tuning while consuming few nanowatts of power. We demonstrated bidirectional tuning by controlling voltage polarity and judicious placement of the actuator above the ring. Traditional MEMS and Optomechanical fabrication processes involve a "release" step that makes them incompatible with commercial foundry manufacturing. However, PORT can also operate unreleased, achieve fast tuning and efficient acousto-optic modulation. I will present immediate applications of PORT for chip-scale frequency combs and clock laser modulation in an atomic clock. If time permits, I will conclude my talk by providing a glimpse of how we are leveraging our mastery of micromachining and MEMS to achieve coherent transduction between spin-defects, phonons and photons. The presented results are from very close collaborations with Professor Tobias Kippenberg’s group at EPFL and Professor Greg Fuchs’ group at Cornell.

    Speaker Bio(s): 

    Sunil received the B.S. and Ph.D. degrees from Berkeley in EECS in 1998 and 2004 respectively. In April 2015, he joined the department of Electrical and Computer Engineering at Purdue University where he was recently promoted to Professor. Sunil received the NSF CAREER Award in 2007, the DARPA Young Faculty Award in 2008 and the IEEE Ultrasonics Society’s Young Investigator Award in 2014. His students have received Best Paper Awards at IEEE Photonics 2012, Ultrasonics 2009 and IEDM 2007. Sunil is a co-founder of Silicon Clocks which was acquired by Silicon Labs in April 2010. Before joining Purdue, Sunil was an associate professor at Cornell for 10 years.


    Refreshments 3:30pm

    Lecture @ 3:45pm - 5pm