报告题目：Phononic Frequency Combs

报  告 人：Adarsh Venkataraman Ganesan，Assistant Professor，Ahmedabad University, India

研究方向：纳米力学

报告时间：2023年8月3日（星期四）晚上18:30

报告地点：Microsoft Teams软件，报告链接https://teams.live.com/meet/9564801544591?p=6RU3jyFlmS6zid9H 

报告摘要：

Mechanical frequency combs are poised to bring the applications and utility of optical frequency combs into the mechanical domain. So far, their main challenge has been strict requirements on drive frequencies and power, which complicate operation.We demonstrate a straightforward mechanism to create a frequency comb consisting of mechanical overtones (integer multiples) of a single eigenfrequency, by monolithically integrating a suspended dielectric membrane with a counter-propagating optical trap. The periodic optical field modulates the dielectrophoretic force on the membrane at the overtones of a membrane’s motion. These overtones share a fixed frequency and phase relation, and constitute a mechanical frequency comb. The periodic optical field also creates an optothermal parametric drive that requires no additional power or external frequency reference. This combination of effects results in an easy-to-use mechanical frequency comb platform that requires no precise alignment, no additional feedback or control electronics, and only uses a single, mW continuous wave laser beam. This highlights the overtone frequency comb as the straightforward future for applications in sensing, metrology and quantum acoustics.

报告人简介：

EDUCATION

Oct.2014–Sept.2017

University of Cambridge, UK Doctor of Philosophy in Engineering

Aug.2010–Aug.2014

Birla Institute of Technology and Science (BITS) Pilani, India

Bachelors of Engineering (Honors) in Electrical and Electronics Engineering

Department Rank 1; GPA: 9.67/10

WORK EXPERIENCE

Aug.2021 to present

Assistant Professor，School of Engineering and Applied Sciences，Ahmedabad University,India