Jigang Wu
Graduate Student
MC 136-93, 4 Moore
Phone: (626) 395-4711
Email: jigang@caltech.edu
Education
MS, Electrical Engineering, California Institute of Technology, 2005
MS, Physics, Tsinghua University, China, 2004
BS, Physics, Tsinghua University, China, 2001
Research Interests
1) Paired-angle Rotation Scanning OCT (PARS-OCT) Probe
This probe design utilizes a pair of angle-cut rotating GRIN lenses to deflect and scan the OCT probe beam across the forward region ahead of the probe tip. In this design, the scan actuation system may be located away from the probe tip, much like in the case of a side-imaging OCT probe, enabling easy miniaturization of the actual probe. By controlling the rotation of the two needles that hold the GRIN lenses, different volumetric scanning schemes can be achieved. A prototype probe has been built to demonstrate our idea. Currently we use tadpoles as our object and we are looking forward to applying the probe to other samples such as animal GI tract etc. The potential application of the PARS-OCT probe is needle guidance in anesthesiology procedure or needle biopsy.
2) Quadrature Phase Microscope based on Harmonically-related Grating Pairs
By recording two harmonically related gratings on the same hologram, we are able to obtain nontrivial phase difference between the output ports of the gratings. The phase difference can be adjusted by changing the relative phase of the recording beams when recording the hologram. We built a Mach-Zehnder interferometer using the holographic gratings as a beam coupler/splitter, and put two CCD cameras in the output ports of the gratings. In this way, we are able to get quadrature full field images in the two cameras and reconstruct the phase image accordingly.
Journal Publications:
1. Jigang Wu, Zahid Yaqoob,
Xin Heng, Lap Man Lee, Xiquan Cui, and Changhuei Yang. 'Full field
phase imaging using a harmonically matched diffraction grating
pair based homodyne quadrature interferometer,' Applied
Physics Letters, 90, 151123 (2007)
2. Jigang Wu, Michael Conry, Chunhui Gu, Fei Wang, Zahid Yaqoob, and Changhuei Yang. 'Paired-angle-rotation scanning optical coherence tomography forward-imaging probe,' Optics Letters, 31, 1265 (2006)
3. Jigang Wu, Ping Xue, Shan Sun and Jihua Guo, "Spectral Shaping in Rapid Scanning optical Delay Line of Optical Coherence Tomography", Chinese Physics Letters, 20, 2172 (2003)
4. Zahid Yaqoob, Jigang Wu, Emily J. McDowell, Xin Heng, and Changhuei Yang. 'Methods and application areas of endoscopic optical coherence,' Journal of Biomedical Optics, 11, 063001 (2006)
5. Xiquan Cui, Xin Heng, Jigang Wu, Zahid Yaqoob, and Changhuei Yang. 'Slanted Hole Array Beam Profiler (SHArP) - A high resolution on-chip beam profiler based on a linear aperture array,' Optics Letters, 31, 3161 (2006)
6. Xin Heng, Xiquan Cui, David W. Knapp,
Jigang Wu , Zahid Yaqoob, Emily J. McDowell, Demetri Psaltis, and Changhuei Yang, 'Characterization of light collection through a subwavelength aperture from a point source', Optics Express, 14, 10410 (2006)
7. Zahid Yaqoob, Jigang Wu, Xiquan Cui, Xin Heng, and
Changhuei Yang.
'Harmonically-related diffraction gratings-based interferometer for quadrature phase measurements,' Optics Express, 14, 8127 (2006)
8. Zahid Yaqoob, Emily McDowell, Jigang Wu, Xin Heng, Jeff Fingler, and Changuei Yang, 'Molecular contrast optical coherence tomography: A pump-probe scheme using indocyanine green as a contrast agent,' Journal of Biomedical Optics, 11, 054017 (2006)
9. Guanglei Xiong, Ping Xue, Jigang Wu, Qin Miao, Rui Wang and Liang Ji, "Particle-fixed Monte Carlo model for optical coherence tomography", Optics Express, 13, 2182 (2005)
10. Tieying Zhou, Kai Zhang, Yu Chen, Huan Wang, Jigang Wu, Kaili Jiang and Ping Xue, "A cylindrical rod ultrasonic motor with 1 mm diameter and its application in endoscopic OCT", Chinese Science Bulletin, Vol. 50, 2005: 826-830
Conference Publications:
1. Jigang Wu, Zahid Yaqoob, Xin Heng, Xiquan Cui, and Changhuei Yang, "Three dimensional imaging using grating-based quadrature phase interferometer", (present in SPIE Photonics West, San Jose, CA, 2007)
2. Jigang Wu, Michael Conry, Chunhui Gu, Fei Wang, Zahid Yaqoob and Changhuei Yang, "Paired Angle Rotation Scanning (PARS) Needle for Optical Coherence Tomography", (Presented in OSA Biomedical Optics Topical Meeting, Fort Lauderdale, FL, 2006)
3. Jigang Wu, Michael Conry, Chunhui Gu, Fei Wang, Zahid Yaqoob and Changhuei Yang, "Forward-cone-imaging OCT needle probe", Proceedings of SPIE, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X , 2006, 6079: 60791J-1 - 60791J-8 (Presented in SPIE Photonics West, San Jose, CA, 2006)
4. Zahid Yaqoob, Emily McDowell, Jigang Wu and Changhuei Yang, "Pump-probe optical coherence tomography using indocyanine green as a contrast agent", Proceedings of SPIE, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X, 2006, 6079: 607904-1 - 607904-8
5. Ping Xue, Jigang Wu, Jiansong Gao and Shan Sun, "Particle-fixed Monte Carlo model for optical coherence tomography", Proceedings of SPIE Vol. 5255 Biomolecular Photonics and Multidimensional Microscopy (SPIE, Bellingham, WA, 2003)
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