Virtual MEchanics GAthering -MEGA- Seminar: Talk 1 - Lithium Niobate based Micro Bulk Acoustic Resonators for communication; Talk 2 - Piezoelectric suspended microchannel resonators for biological applications
Event details
| Date | 27.05.2021 |
| Hour | 16:15 › 17:30 |
| Speaker | Soumya Yandrapalli & Damien Maillard (NEMS, EPFL) |
| Location |
https://epfl.zoom.us/s/84678428267 Passcode: 174387
Online
|
| Category | Conferences - Seminars |
Talk 1: Lithium Niobate based Micro Bulk Acoustic Resonators for communication, by Soumya Yandrapalli (NEMS, EPFL)
Abstract A bulk acoustic wave confined in a solid medium at micrometric or nanometric scales can be used in high frequency applications to build oscillators and filters. Typically, piezoelectric resonators are used as transducers: in actuation, to provide electric excitation in order to generate standing bulk acoustic wave resonance; in detection, to simultaneously read out this resonance in the form of an electrical signal. With the advent of 5G, the current piezoelectric resonator technologies need to leap forward in order to yield the very demanding requirements of higher data rates with low losses and strict tolerances. In this presentation, I will talk about using piezoelectric mono-crystalline Lithium Niobate micro resonators as a filter communication element. We will discuss how these resonators can potentially solve current frequency and bandwidth limitations. In particular, I will present design, fabrication and measurements results of a filter prototype which uses these resonators at 5GHz.
Bio Soumya Yandrapalli is currently a PhD in the Advanced Nano Electromechanical Systems Lab at EPFL. She received her Master’s degree in Micro- and nanotechnologies for integrated systems (MNIS) from PoliTo, INPG and EPFL. Her research focuses on using piezoelectric resonators for sensing and communication.
Talk 2: Piezoelectric suspended microchannel resonators for biological applications, by Damien Maillard (NEMS, EPFL)
Abstract Suspended microchannel resonators (SMRs) are singly- or doubly-clamped beams with an embedded microfluidic channel inside. Some applications of those devices consist of the measurement of the density or viscosity of liquid samples at the picoliter scale. In addition to that, they can be used to characterize physical properties of cells (density, mass, volume, deformation) at the single entity level. An important aspect of SMRs is their transduction mechanism. So far, most of the devices are being actuated with an external shaker, while being detected optically, with a lever or via laser Doppler vibrometry, which can be cumbersome, time-consuming and difficult to operate.
In our group, we have developed the first SMRs with full on-chip piezoelectric transduction, and we operate the devices without needing any external equipment apart from a lock-in amplifier. During this talk, I will talk about how we can fabricate those devices, and give an overview of some experiments that we have performed with polystyrene beads and populations of bacteria.
Bio I have been a PhD student in the NEMS laboratory directed by Prof. Villanueva since 2017. Before that I did a Bachelor in microengineering at EPFL, with a third year as an Erasmus student in KTH, Stockholm, and a Master in microengineering with specialization in micro/nano systems, also at EPFL.
Abstract A bulk acoustic wave confined in a solid medium at micrometric or nanometric scales can be used in high frequency applications to build oscillators and filters. Typically, piezoelectric resonators are used as transducers: in actuation, to provide electric excitation in order to generate standing bulk acoustic wave resonance; in detection, to simultaneously read out this resonance in the form of an electrical signal. With the advent of 5G, the current piezoelectric resonator technologies need to leap forward in order to yield the very demanding requirements of higher data rates with low losses and strict tolerances. In this presentation, I will talk about using piezoelectric mono-crystalline Lithium Niobate micro resonators as a filter communication element. We will discuss how these resonators can potentially solve current frequency and bandwidth limitations. In particular, I will present design, fabrication and measurements results of a filter prototype which uses these resonators at 5GHz.
Bio Soumya Yandrapalli is currently a PhD in the Advanced Nano Electromechanical Systems Lab at EPFL. She received her Master’s degree in Micro- and nanotechnologies for integrated systems (MNIS) from PoliTo, INPG and EPFL. Her research focuses on using piezoelectric resonators for sensing and communication.
Talk 2: Piezoelectric suspended microchannel resonators for biological applications, by Damien Maillard (NEMS, EPFL)
Abstract Suspended microchannel resonators (SMRs) are singly- or doubly-clamped beams with an embedded microfluidic channel inside. Some applications of those devices consist of the measurement of the density or viscosity of liquid samples at the picoliter scale. In addition to that, they can be used to characterize physical properties of cells (density, mass, volume, deformation) at the single entity level. An important aspect of SMRs is their transduction mechanism. So far, most of the devices are being actuated with an external shaker, while being detected optically, with a lever or via laser Doppler vibrometry, which can be cumbersome, time-consuming and difficult to operate.
In our group, we have developed the first SMRs with full on-chip piezoelectric transduction, and we operate the devices without needing any external equipment apart from a lock-in amplifier. During this talk, I will talk about how we can fabricate those devices, and give an overview of some experiments that we have performed with polystyrene beads and populations of bacteria.
Bio I have been a PhD student in the NEMS laboratory directed by Prof. Villanueva since 2017. Before that I did a Bachelor in microengineering at EPFL, with a third year as an Erasmus student in KTH, Stockholm, and a Master in microengineering with specialization in micro/nano systems, also at EPFL.
Practical information
- General public
- Free
Organizer
- MEGA.Seminar Organizing Committee