11120E500100 College of Engineering Seminar
工學院英文書報討論

主題 TOPIC
▸　From Visible to See Through

摘要 Abstract
❝　To reduce tissue trauma before and during surgical procedures, our research team has focused on developing novel technologies to create an integrated 2D scanning imaging system for endoscopy and optical coherence tomography. Recent research has expanded to include the use of Terahertz (THz) bandwidth for non-destructive tissue biopsy. 
❝　Current flexible endoscopes are designed to minimize trauma, but their field of view is limited by the optical aperture, whether it's a fiber bundle or camera. To address this issue, a mechanically-resonating single-pixel waveguide cantilever scanner has been successfully demonstrated for image acquisition using microelectromechanical (MEMs) techniques. This imaging system is more compact than any existing system while providing a comparable field of view and resolution. Additionally, an improved scanner has been fabricated that fully integrates the waveguide, light source, actuators, and detection system for the applications. 
❝　To further reduce tissue trauma, a non-mechanical scanner has been developed that uses an integrated polymer lens array, gratings, and prism beam steering devices. This scanner uses an electro-optic (EO) medium to accomplish beam collimation and deflection, eliminating the need for mechanical resonance. An EO polymer with low absorption wavelength in the visible band and high optical nonlinearity has been specifically developed for this application, utilizing micro- and nano-fabrication techniques to create the polymerbased optical components. 
❝　For non-destructive biopsies, a portable THz beam steering device is being developed that uses gradient metamaterials. Traditional systems steer electromagnetic (EM) waves in free space, resulting in bulky systems with limited spatial resolution. The proposed THz imaging system integrates advancements in EO components and tunable metamaterial into a compact beam steering device that guides the THz beam through a raster scan of the area of interest to acquire a THz image and achieve maximal beam steering angles (field of view) and confinement with subwavelength beam sizes, thus minimizing the system size and increasing the spatial resolution beyond the Abbe limit. 
❝　In this presentation, the theory, application, and demonstration of image acquisition and beam steering for all three techniques will be discussed.　 ❞

講者 SPEAKER
▸　王威智教授 Prof. Wei-Chih WANG
▸　國立清華大學動力機械工程學系 Department of Power Mechanical Engineering, National Tsing Hua University

簡歷 Short Bio
❝　Dr. Wei-Chih Wang is currently an Associate Professor in Power Mechanical Engineering and the Institute of Nanoengineering and Microsystems at the National Tsing Hua University. He is also an affiliated Associate Professor in the Department of Mechanical Engineering and the Department of Electrical and Computer Engineering at the University of Washington. He received his degree in electrical engineering from the University of Washington in 1996 and completed a postdoctoral fellowship for a DARPA-funded piezoelectric MEMS project at the University of Hawaii in 1996-1997. 
❝　Dr. Wang has authored or co-authored over 220 technical publications and holds 31 US and PCT patents. His research has focused on developing polymer-based microsensors and actuators for industrial and biomedical applications. In recent years, he has expanded his work to include research on THz, IR, and visible band 3-D metamaterials, as well as electromagnetic and electro-active polymer material study. He has also established a new field of study called amorphous and metamorphous structure and material. 
❝　Dr. Wang is currently a Senior Member of SPIE, a member of IEEE, Eta Kappa Nu, and NIH review committee. He serves as an associate editor and a member of the editorial board for the International Journal of Optomechatronics and the Sensors & Transducers Journal. He has also served on program committees for SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, as well as the International Symposium on Optomechatronics Technologies (ISOT) since 2003 and 2009, respectively. Additionally, he has served as general conference Chair for the International Symposium on Optomechatronics Technologies conference in Jeju, Korea in 2013 and Seattle, USA in 2014.　❞

時間 TIME
▸　2023/05/09 (TUE) 13:20 ~ 15:10

地點 VENUE
▸　工程一館201教室 Classroom 201, Engineering Building 1