Wireless power transfer to microimplants
Medical electronics are capable of precisely monitoring or modulating activity in the human body, and thus hold promise for treating a broad range of diseases. To implant electronic devices in the body, they need to be miniaturized and powered wirelessly across complex biological tissue. We are developing a new method of electromagnetic energy transfer, termed midfield powering, to power devices at the scale of a millimeter or less anywhere in the body, including the heart and the brain. Our approach spans fundamental studies of wave-tissue interactions, development of new electromagnetic structures, and experiments in both computational and animal tissue models.
- J. S. Ho, A. J. Yeh, E. Neofytou, S. Kim, Y. Tanabe, B. Patlolla, R. E. Beygui, and A. S. Y. Poon, “Wireless power transfer to deep-tissue microimplants,” PNAS, 111, 7974-7979 (2014). Summary in Physics Today.
- S. Kim, J. S. Ho, and A. S. Y. Poon, “Midfield wireless powering of subwavelength autonomous devices,” Phys. Rev. Lett., 110, 203905 (2013).
- S. Kim, J. S. Ho, L. Y. Chen, and A. S. Y. Poon, “Wireless power transfer to a cardiac implant,” Appl. Phys. Lett., 101, 073701 (2012).
Low-power biomedical integrated circuits
Advances in integrated circuit technology have enabled electronic systems that can augment or even replace physiological functions. While the processing capabilities of these devices are virtually unlimited, the available energy is highly constrained. Our research combines low-power architectures with innovations in circuit design techniques to design biomedical electronics capable of ultra-low-power operation in the human body.
- M. Taghivand, K. Aggarwal, and A. S. Y. Poon, “A 3.24GHz to 8.45GHz low phase noise mode switching oscillator,” Proc. IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, Feb. 2014.
- A. Yakovlev, D. Pivonka, T. H. Meng, and A. S. Y. Poon, “A mm-sized Wirelessly Powered and Remotely Controlled Locomotive Implantable Device,” Proc. IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, Feb. 2012.
Wireless neuromodulation platforms
The modulation of neural activity with electronic devices is required to understand the function of brain circuits and to treat its disorders. Our research focuses on developing new wireless tools for activity modulation and recording in both the brain and the periphery. Targeted technologies include wireless platforms for experiments in freely-moving animals and tiny, fully-implantable devices for controlled delivery of light or electrical pulses.
- A. J. Yeh, J. S. Ho, Y. Tanabe, E. Neofytou, R. E. Beygui, and A. S. Y. Poon, “Wirelessly Powering Miniature Implants for Optogenetic Stimulation,” Appl. Phys. Lett., 103, 163701 (2014).