Prof. Huikai Xie
Beijin Institute of Technology
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Academic Career Length
28Years (1999-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
In recent years, Light Detection and Ranging (LiDAR) has been drawing extensive attention both in academia and industry because of the increasing demand for autonomous vehicles. LiDAR is believed to be the crucial sensor for autonomous driving and flying, as it can provide high-density point clouds with accurate three-dimensional information. This review presents an extensive overview of Microelectronechanical Systems (MEMS) scanning mirrors specifically for applications in LiDAR systems. MEMS mirror-based laser scanners have unrivalled advantages in terms of size, speed and cost over other types of laser scanners, making them ideal for LiDAR in a wide range of applications. A figure of merit (FoM) is defined for MEMS mirrors in LiDAR scanners in terms of aperture size, field of view (FoV) and resonant frequency. Various MEMS mirrors based on different actuation mechanisms are compared using the FoM. Finally, a preliminary assessment of off-the-shelf MEMS scanned LiDAR systems is given.
19 May 2009 in Proceedings of the IEEE
Journal Article
PMPaul F. McManamon
Paul F. McManamon
PBPhilip J. Bos
Philip J. Bos
MEMichael J. Escuti
Michael J. Escuti
JHJason Heikenfeld
Jason Heikenfeld
SSSteve Serati
Steve Serati
EWEdward A. Watson
Edward A. Watson
+1
Nonmechanical steering of optical beams will enable revolutionary systems with random access pointing, similar to microwave radar phased arrays. An early approach was birefringent liquid crystals writing a sawtooth phase profile in one polarization, using 2pi resets. Liquid crystals were used because of high birefringence. Fringing fields associated with voltage control required to implement the 2pi resets have limited the efficiency and steering angle of this beam steering approach. Because of steering angle limitations, this conventional liquid crystal steering approach is usually combined with a large angle step-steering approach. Volume holograms, birefringent prisms or sawtooth-profile birefringent phase gratings, and circular-type polarization gratings are the large angle step steering approaches that will be reviewed in this paper. Alternate steering approaches to the combined liquid crystal and step-steering approach exist. Microelectromechanical system mirrors, lenslet arrays, electrowetting, and a variable birefringent grating approach will be reviewed and compared against the conventional liquid crystal and step-steering approaches. Step-steering approaches can also be combined with these approaches. Multiple nonmechanical steering approaches are developing that will allow high-efficiency steering, excellent steering accuracy, and wide fields of view.
15 December 2001 in Optics Letters
Journal Article
An endoscopic optical coherence tomography (OCT) system based on a microelectromechanical mirror to facilitate lateral light scanning is described. The front-view OCT scope, adapted to the instrument channel of a commercial endoscopic sheath, allows real-time cross-sectional imaging of living biological tissue via direct endoscopic visual guidance. The transverse and axial resolutions of the OCT scope are roughly 20 and , respectively. Cross-sectional images of pixels covering an area of can be acquired at and with nearly 100-dB dynamic range. Applications in thickness measurement and bladder tissue imaging are demonstrated.
6 February 2006 in Optics Express
Journal Article
LFLing Fu
Ling Fu
AJAnkur Jain
Ankur Jain
Huikai XieCCCharles Cranfield
Charles CranfieldMGMin Gu
Min Gu
Two-photon fluorescence and second harmonic generation microscopy have enabled functional and morphological in vivo imaging. However, in vivo applications of those techniques to living animals are limited by bulk optics on a bench top. Fortunately, growing functionality of fiber-optic devices and miniaturization of scanning mirrors stimulate the race to develop nonlinear optical endoscopy. In this paper, we report on a prototype of a nonlinear optical endoscope based on a double-clad photonic crystal fiber to improve the detection efficiency and a MEMS mirror to steer the light at the fiber tip. The miniaturized fiber-optic nonlinear microscope is characterized by rat esophagus imaging. Line profiles from the rat tail tendon and esophagus prove the potential of the technology in in vivo applications.
24 July 2009 in Journal of Microelectromechanical Systems
Journal Article
This paper presents the design, optimization, fabrication, and test results of an electrothermally actuated tip-tilt-piston micromirror with a large optical aperture of 1 mm. The fabrication of the device is a combination of thin-film surface micromachining and bulk silicon micromachining based on silicon-on-insulator wafers. The device has 3-DOF of actuations, including rotations around two axes in the mirror plane, and out-of-plane piston actuation. The micromirror shows an optical scan range of plusmn30deg about both x- and y-axes and displaces 480 mum in the z-axis, all at dc voltages that are less than 8 V. Dynamic testing of the micromirror shows that the thermal response time of each actuator is about 10 ms. Resonant frequencies of the piston and rotation motion are 336 and 488 Hz, respectively. The unique structural design of the device ensures that there is no lateral shift for the piston motion and no rotation-axis shift for the rotation scanning. With the large tip-tilt-piston scan ranges and low driving voltage, this type of device is very suitable for biomedical imaging and laser beam steering applications.
24 May 2010 in Optics Express
Journal Article
JSJingjing Sun
Jingjing SunSGShuguang Guo
Shuguang Guo
LWLei Wu
Lei Wu
LLLin Liu
Lin Liu
Se-woon ChoeHuikai Xie +1
3D in vivo optical imaging on a mouse has been obtained using a 2D MEMS mirror for lateral scanning in a time-domain optical coherence tomography (OCT) system. The MEMS mirror aperture size is 1 × 1 mm2, and the device footprint is 2 × 2 mm2. The MEMS mirror scans ± 30° optical angles about both x and y-axis at only 5.5V DC voltage. An endoscopic probe with an outer diameter of 5.8 mm has been designed, manufactured and packaged. The probe scans an average transverse area of 2 mm × 2 mm. The imaging speed of the probe is about 2.5 frames per second, limited by the speed of the employed optical delay line.
About Me
Prof. Dr. Huikai Xie has been a Professor at the School of Integrated Circuits and Electronics, Beijing Institute of Technology, since 2020. He is also a Professor at the Department of Electrical and Computer Engineering at the University of Florida. He received his master’s degree in electro-optics from Tufts University in 1998 and his Ph.D. degree in electrical and computer engineering from Carnegie Mellon University in 2002. He was a research faculty at the Institute of Microelectronics at Tsinghua University, Beijing, China. He has published over 300 technical articles and 11 book chapters and holds over 30 U.S. patents and over 40 Chinese patents. His research is mainly focused on the development of innovative optical and acoustic MEMS devices and their applications in various beam-steering microsystems and endoscopic imaging modalities. The goal is to develop enabling micro/nanofabrication technology and build innovative integrated microsystems with improved performance, functionality, and affordability for medical, industrial, space, and consumer electronics applications. His current research activities include optical MEMS, micromirrors, microactuators, piezoelectric MEMS microspeakers and ultrasonic transducers, biophotonics, optical endomicroscopy, optical coherence tomography (OCT), photoacoustic microscopy, two-photon microscopy for in vivo brain imaging, micro LiDAR, and microspectrometers.