Liwei Lin (Advisor)

Research Advised by Professor Liwei Lin

Jong Ha Park

Graduate Student Researcher
Mechanical Engineering
Professor Liwei Lin (Advisor)
Ph.D. 2026 (Anticipated)

BPN855: Flexible Energy Harvester, Sensor, and Actuator

Yu Long
2022

Flexible, wearable, and implantable devices are expected to become more abundant due to developments in materials and microfabrication technologies. In our previous work, we have successfully achieved a kind of flexible actuators that can work at low voltage and give haptic feedback. Now we are moving forward to develop energy harvesters with various sets of flexible materials and structures that can 1) harvest energy from outside stable environment; 2) generate electricity in a relatively long time; and 3) give enough energy output to power up small devices.

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BPN955: Nanostructured Plasmonic Biosensor

Kamyar Behrouzi
2022

We developed three different sensors:

1- Gold nanoparticle based colorimetric COVID sensor;
2- Coffee ring based COVID and Cancer biosensor;
3- Exceptional point (EP) metasurface and integrated photonics circuit sensor (currently under investigation)

These sensors cover wide range of applications, from at-home rapid tests to extremely sensitive clinical diagnosis.

So far we achieved femtomolar sensitivities and we hope to achieve attomolar level using the last method.

BPN941: Ultrasound-Induced Haptic Interface

Fan Xia
Wei Yue
2022

The next big thing, AR/VR, requires an immersive Human Machine Interface (HMI) in addition to visual and sound stimuli. Although skin is the biggest organ in the human body, very few efforts compared to visual and auditory senses have been done to develop a “sense of touch”. The mechanical stimulus to generate the touch sense by the embedded mechanoreceptors in the skin at different depths has been created in many ways as vibratory actuators, microneedles, etc. In this project, we are investigating to create haptic interface via radiation force generated by piezoelectric...

Fanping Sui

Graduate Student Researcher
Mechanical Engineering
Professor Liwei Lin (Advisor)
Ph.D. 2022 (Anticipated)

Fanping Sui received his B.S. in Theoretical and Applied Mechanics from University of Science and Technology of China in 2018 (ranked 1st) and M.S. in Mechanical Engineering from University of California, Berkeley in 2019. He is currently pursuing Ph.D. in MEMS/Nano in Mechanical Engineering at UC Berkeley under the supervision of Professor Liwei Lin.

BPN743: Highly Responsive pMUTs

Yande Peng
Fan Xia
Hanxiao Liu
2022

Ultrasonics has been realized as a nondestructive measurement method for a variety of applications, such as medical imaging, healthcare monitoring, structural testing, range finding, and motion sensing. Furthermore, high intensity ultrasound can be used in therapeutic treatments, such as lithotripsy for kidney stone comminution, hyperthermia for cancer therapy, high-intensity focused ultrasound (HIFU) for laparoscopic surgery and transcranial sonothrombolysis for brain stroke treatment. MEMS ultrasonic transducers are known to have several pronounced advantages over the conventional...

BPN962: Insect-Scale Flying Robots

Fanping Sui
Kamyar Behrouzi
Wei Yue
2022

Insect-scale untethered flight with maneuverability is very challenging toward possible practical applications and attitude-stabilized flight (hovering) is one of the first steps for long-time air flight operations. In this project, we introduce the insect-scale, untethered, rotating-wing aerial vehicles with inherent stability by the gyroscopic effect to achieve several key advancements: (1) powered by alternating magnetic fields wirelessly; (2) 160-mg in weight and 20.0-mm-in-diameter in size – smallest untethered flying robot in the world; and (3) attitude-stabilized flights (...

BPN877: Pulse Acquisition and Diagnosis for Health Monitoring

Ruiqi Guo
2022

Traditional Chinese medicine(TCM) has existed for more than two thousand years and one of the important diagnostic methods is the pulse diagnosis. It generally takes decades of training for a practitioner to master this skill as pulse acquisition and diagnosis require long-term experiences and are very subjective. The project aims to use the combination of advanced sensor technology and artificial intelligence to emulate the TCM practice for health monitoring. A flexible piezoelectric film is designed to record the wrist pulse data. A group of representative pulse features has been...

BPN940: Self-healing Materials for Sensing, Energy Storage and Harvesting Applications

Peisheng He
Yande Peng
Hanxiao Liu
2022

Animal skins often possess both functions of sensing and actuating to detect external stimulations and change shapes when needed, respectively. Furthermore, many animals, such as jellyfish and leptocephalus (eel larvae) have tissues that are transparent and ultra-stretchable, which are difficult to build in synthetic sensors and actuators. Moreover, all these living skins have self-healing properties, i.e. to restore their critical functions after being damaged. On the contrary, artificial electronic systems are often brittle and non-transparent. As such, biomimetic, skin-like...

Yu Long

Alumni
Mechanical Engineering
Professor Liwei Lin (Advisor)
Ph.D. 2022

Yu received her B.E. in Material Science & Engineering from Tsinghua University in 2018. She is currently pursuing a Ph.D. in Mechanical Engineering under the supervision of Prof. Liwei Lin and is expected to graduate in 2022. Her research interest lies in polymers and their applications in energy harvesters.

Dissertation title: Renewable Polymeric Energy Harvesters from Moisture and Heat