11420E500100 工學院英文書報討論／Seminar

主題 TOPIC
▸　Overview of Our Continuous Development in Beam Steering and Imaging Systems for Biomedical, THz, and Hyperspectral Applications

❝　To reduce tissue trauma before and during surgical procedures, our research has focused on developing advanced technologies for integrated 2D scanning imaging systems in endoscopy and optical coherence tomography. These core beam-steering and scanning technologies have also been extended to other biomedical optical imaging systems. More recently, this effort has expanded into the Terahertz (THz) regime for non-destructive biological and tissue imaging applications.
❝　Conventional flexible endoscopes are designed to minimize trauma, but their field of view remains fundamentally limited by the optical aperture, whether based on fiber bundles or miniature cameras. To address this limitation, we have demonstrated a mechanically resonant single-pixel waveguide cantilever scanner for image acquisition using microelectromechanical systems (MEMS) techniques. This approach enables a compact imaging platform that achieves a field of view and resolution comparable to conventional systems while significantly reducing system size, and integrates the waveguide, light source, actuation, and detection elements into a unified scanning platform. An improved version has further reduced fabrication complexity and improved scanning performance by leveraging nonlinear vibration dynamics and non-semiconductor substrate materials.
❝　To further reduce mechanical contact and associated tissue disturbance, we developed a non-mechanical scanning architecture based on integrated polymer lens arrays, gratings, and prism-based beam steering elements. This system utilizes an electro-optic (EO) medium to achieve beam collimation and deflection without mechanical resonance. A specially engineered EO polymer with low absorption in the visible spectrum and high optical nonlinearity was developed using micro- and nanofabrication techniques to realize the required optical components.
❝　For non-destructive tissue imaging and biopsy applications, we are developing a portable THz beam-steering system based on gradient metamaterials. In contrast to conventional free-space electromagnetic steering systems, which are typically bulky and limited in spatial resolution, our approach integrates tunable metamaterials with electro-optic components to enable compact THz beam control. The system performs scanning over the region of interest to reconstruct THz images, achieving good steering angles, strong beam confinement, and subwavelength beam sizes in both far field and near field application.
❝　In this presentation, we will discuss the underlying principles, applications, and experimental demonstrations of image acquisition and beam steering across these three approaches. We will also provide an overview of our laboratory research, highlighting past, current, and future efforts in the development of amorphous and metamorphic materials and structures for electromagnetic applications. 　❞

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

時間 TIME
▸　2026/05/12 (TUE) 13:20 ~ 15:10

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