報告時間：2024年5月16日（星期四）14:00
報告地點：翡翠湖校區科教樓A座第五會議室
報 告 人：Joel Moser 教授
工作單位：蘇州大學
舉辦單位：物理學院
報告簡介：
Mechanical information processing conjures up images of 19th century automatons outfitted with gears and levers. It is, however, a thriving research area that has grown alongside the field of electron-based information processing, both of which benefitting from progress in micro and nanofabrication. In this context, nanomechanical resonators have been employed as antennas, filter banks, mixers, oscillators, modulators, non-volatile memory devices, and logic circuits, thereby demonstrating their usefulness as building blocks for signal processors. In this presentation, I will introduce our research on mechanical information encoding based on graphene nanomechanical resonators. The latter can be pictured as atomically thin drumheads with resonant frequencies ranging from one megahertz to hundreds of megahertz. The first part of the presentation will be about our work on graphene nonlinear parametric resonators. These mesoscopic vibrational systems host up to 5 phase states. I will describe how we select these states with a coherent driving force that lifts their degeneracy and how we control them with a gate voltage. The second part will be about our work on graphene nanomechanical video receivers. We encode digitally modulated video signals in the vibrations of graphene resonators and transfer this encoding from the vibrations to an optical field. We find that the digital bit streams we employ to drive vibrations are exquisitely sensitive to the phase of vibrations and can be employed to characterize nanomechanical nonlinearities. Overall, I will propose that useful information can be encoded in graphene nanomechanical vibrations in several interesting and playful ways.
報告人簡介：
Joel Moser，蘇州大學光電科學與工程學院教授，博士生導師，國自然外國資深學者項目獲得者，江蘇省級特聘教授。Joel Moser教授于1999年在法國巴黎第十一大學取得固體物理學博士學位，1999年至2002年在美國波斯頓大學從事博士后研究，之后在德國沃爾特肖特基學院、慕尼黑大學納米技術中心、西班牙納米技術研究所和光子科學研究所擔任研究員，2015年10月全職加盟蘇州大學光電科學與工程學院。Joel Moser教授先后主持多項國家級和省級科研項目，并且在Reviews of Modern Physics、Science、Nature Nanotechnology、Nature Communications、Communications Engineering、Physical Review Letters、Nano Letters 等多個國際重要學術刊物上發表學術成果。
