Prof. Wonshik Choi Profile

Prof. Wonshik Choi

Associate professor at Korea Univ

SPIE Involvement:

Conference Program Committee | Author

Publications (20)

Proceedings Article | 2 October 2024 Presentation + Paper

Presentation + Paper

Comparative analysis of wavefront aberrations between plano-convex lenses and metalenses

Chan-Wook Baik, Jungho Moon, Jang Hwan Tae, Kyoungjin Park, Jaeduck Jang, Jaekwan Kim, Byonggwon Song, JeongYub Lee, Heejin Choi, Wonshik Choi, Hyuck Choo, Seokho Yun

Proceedings Volume 13109, 131090K (2024) https://doi.org/10.1117/12.3027543

KEYWORDS: Point spread functions, Wavefront aberrations, Monochromatic aberrations, Modulation transfer functions, Metalenses, Lenses, Zernike polynomials, Wavefronts, Diffraction limit, Spherical lenses

Read Abstract +

Proceedings Article | 13 March 2024 Poster

Poster

Full-field photoacoustic tomography for in-vivo volumetric imaging

Taeil Yoon, Younggue Kim, Wonshik Choi, Byeong Ha Lee

Proceedings Volume PC12842, PC1284232 (2024) https://doi.org/10.1117/12.3003631

KEYWORDS: Photoacoustic tomography, Photoacoustic imaging, In vivo imaging, Ultrasound transducers, Wavefronts, Acquisition tracking and pointing, Wavefront reconstruction, Wave propagation, Ultrasonics, Target acquisition

Read Abstract +

Proceedings Article | 4 March 2019 Presentation

Presentation

Experimental mapping of near-field modes by measuring far- to near-field transmission matrix (Conference Presentation)

Eunsung Seo, Young-Ho Jin, Wonjun Choi, Yonghyeon Jo, Kyung-Deok Song, Joonmo Ahn, Myung-Ki Kim, Wonshik Choi

Proceedings Volume 10927, 109270D (2019) https://doi.org/10.1117/12.2508439

KEYWORDS: Near field, Near field scanning optical microscopy, Near field optics, Nanostructures, Optical scanning systems, Optical microscopes, Wavefronts, Diffraction

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Proceedings Article | 15 March 2018 Presentation

Presentation

Removal of back-reflection noise at ultrathin imaging probes by the single-core illumination and wide-field detection (Conference Presentation)

Changhyeong Yoon, Munkyu Kang, Jin Hee Hong, Taeseok Yang, Jingchao Xing, Hongki Yoo, Youngwoon Choi, Wonshik Choi

Proceedings Volume 10502, 1050214 (2018) https://doi.org/10.1117/12.2288116

KEYWORDS: Signal detection, Spatial resolution, Sensors, Image transmission, Endoscopy, Diagnostics, Endoscopes, Lenses, Natural surfaces, Interference (communication)

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Proceedings Article | 14 March 2018 Presentation

Presentation

Focusing of light energy inside a scattering medium by controlling the time-gated multiple light scattering (Conference Presentation)

Ye-Ryoung Lee, Seungwon Jeong, Sungsam Kang, Wonjun Choi, Jin Hee Hong, Jin-Sung Park, Yong-Sik Lim, Hong-Gyu Park, Wonshik Choi

Proceedings Volume 10502, 105020K (2018) https://doi.org/10.1117/12.2286821

KEYWORDS: Light scattering, Scattering, Tissues, Diffusion, Photonics, In vivo imaging, Life sciences, Multiple scattering, Reflectivity, Optical imaging

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Proceedings Article | 19 April 2017 Presentation

Presentation

High-resolution image reconstruction for GRIN rod lens probe (Conference Presentation)

Hyung-Jin Kim, Kwan Jun Park, Taeseok Yang, Wonshik Choi, Beop-Min Kim, Youngwoon Choi

Proceedings Volume 10040, 100400T (2017) https://doi.org/10.1117/12.2251768

KEYWORDS: Optical design, Image resolution, GRIN lenses, Digital holography, Distortion, Image quality, Interferometry, Wavefronts, Imaging devices, Image restoration

Read Abstract +

Proceedings Article | 27 April 2016 Presentation

Presentation

Synthetic aperture imaging of objects embedded within scattering media (Conference Presentation)

Pilsung Kang, Wonshik Choi

Proceedings Volume 9718, 971824 (2016) https://doi.org/10.1117/12.2211535

KEYWORDS: Scattering, Light scattering, Synthetic aperture imaging, Scattering media, Tissues, Laser scattering, Digital holography, Optical imaging, Synthetic apertures, Multiple scattering

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Proceedings Article | 27 April 2016 Presentation

Presentation

Biophotonic applications of eigenchannels in a scattering medium (Conference Presentation)

Moonseok Kim, Wonjun Choi, Youngwoon Choi, Changhyeong Yoon, Wonshik Choi

Proceedings Volume 9717, 97170R (2016) https://doi.org/10.1117/12.2213169

KEYWORDS: Scattering, Biophotonic applications, Scattering media, Light scattering, Glasses, Skin, Tissues, Tissue optics, Polarization, Reflectivity

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Proceedings Article | 27 April 2016 Presentation

Presentation

Dense sampled transmission matrix for high resolution angular spectrum imaging through turbid media via compressed sensing (Conference Presentation)

Hwanchol Jang, Changhyeong Yoon, Wonshik Choi, Tae Joong Eom, Heung-No Lee

Proceedings Volume 9717, 971714 (2016) https://doi.org/10.1117/12.2212760

KEYWORDS: Image quality, Image restoration, Spatial resolution, Compressed sensing, Calibration, Image resolution, Image analysis, Inverse problems, Speckle, Optical imaging

Read Abstract +

Proceedings Article | 27 April 2016 Presentation

Presentation

Long-range and depth-selective imaging of macroscopic targets using low-coherence and wide-field interferometry (Conference Presentation)

Sungsoo Woo, Sungsam Kang, Changhyeong Yoon, Wonshik Choi

Proceedings Volume 9713, 97130E (2016) https://doi.org/10.1117/12.2211552

KEYWORDS: Prisms, Imaging systems, Interferometry, Holography, 3D displays, Time of flight cameras, Cameras, Time metrology, Image resolution, Digital holography

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Proceedings Article | 27 April 2016 Presentation

Presentation

High-resolution and ultra-thin endo-microscopy using a GRIN rod lens (Conference Presentation)

Hyung-Jin Kim, Changhyeong Yoon, Taeseok Yang, Wonshik Choi, Beop-Min Kim, Youngwoon Choi

Proceedings Volume 9691, 96910F (2016) https://doi.org/10.1117/12.2209228

KEYWORDS: GRIN lenses, Image processing, Optical aberrations, Endoscopes, Optical design, Lens design, Image resolution, Wavefronts, Optical testing, Scattering media

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SPIE Journal Paper | 12 December 2012 Open Access

Open Access

Real-time phase-contrast imaging of photothermal treatment of head and neck squamous cell carcinoma: an in vitro study of macrophages as a vector for the delivery of gold nanoshells

Taeseok Yang, Wonshik Choi, Tai Hyun Yoon, Kyoung Jin Lee, Jae-Seung Lee, Sang Hun Han, Min-Goo Lee, Hong Soon Yim, Kyung Min Choi, Min Woo Park, Kwang-Yoon Jung, Seung-Kuk Baek

JBO, Vol. 17, Issue 12, 128003, (December 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.12.128003

KEYWORDS: Nanoparticles, Cancer, Gold, Near infrared, Tumors, Silica, Real time imaging, Head, Photothermal effect, Oncology

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SPIE Journal Paper | 23 February 2012 Open Access

Open Access

Three-dimensional differential interference contrast microscopy using synthetic aperture imaging

Moonseok Kim, Youngwoon Choi, Wonshik Choi, Christopher Fang-Yen, Yongjin Sung, Ramachandra Dasari, Michael Feld, Kwanhyung Kim

JBO, Vol. 17, Issue 02, 026003, (February 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.2.026003

KEYWORDS: Digital image correlation, Microscopy, 3D image processing, Objectives, Synthetic aperture microscopy, Image enhancement, Stereoscopy, Synthetic aperture imaging, Image processing, 3D image enhancement

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Proceedings Article | 11 February 2012 Paper

Paper

A reflection-mode configuration for enhanced light delivery through turbidity

Timothy Hillman, Youngwoon Choi, Niyom Lue, Yongjin Sung, Ramachandra Dasari, Wonshik Choi, Zahid Yaqoob

Proceedings Volume 8227, 82271T (2012) https://doi.org/10.1117/12.909735

KEYWORDS: Spatial light modulators, Signal detection, Wavefronts, Light scattering, Scattering, Tissue optics, Optical coherence tomography, Interferometry, Modulation, Microscopy

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Proceedings Article | 23 February 2011 Paper

Paper

Sagnac-interferometry-based digital optical phase conjugation (DOPC) system for turbidity suppression

Timothy Hillman, YongKeun Park, Zahid Yaqoob, Wonshik Choi, Dan Fu, Toyohiko Yamauchi, Ramachandra Dasari, Michael Feld

Proceedings Volume 7904, 790417 (2011) https://doi.org/10.1117/12.875918

KEYWORDS: Spatial light modulators, Phase conjugation, Scattering, Tissue optics, Light scattering, Optical proximity correction, Laser scattering, Multiple scattering, Mirrors, Wave propagation

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Proceedings Article | 23 February 2011 Paper

Paper

Wide-field reflection phase microscope

Zahid Yaqoob, Toyohiko Yamauchi, Dan Fu, Wonshik Choi, Ramachandra Dasari, Michael Feld

Proceedings Volume 7904, 79040T (2011) https://doi.org/10.1117/12.875877

KEYWORDS: Microscopes, Reflection, Interferometry, Beam splitters, Optical coherence tomography, Phase imaging, Phase measurement, Diffraction gratings, Single mode fibers, Microscopy

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SPIE Journal Paper | 1 January 2011 Open Access

Open Access

Video-rate tomographic phase microscopy

Christopher Fang-Yen, Wonshik Choi, Yongjin Sung, Charles Holbrow, Ramachandra Dasari, Michael Feld

JBO, Vol. 16, Issue 1, 011005, (January 2011) https://doi.org/10.1117/12.10.1117/1.3522506

KEYWORDS: Refractive index, Tomography, Microscopy, Video microscopy, Phase measurement, Reconstruction algorithms, Video, Diffraction, Cameras, Fringe analysis

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SPIE Journal Paper | 1 March 2010 Open Access

Open Access

Static and dynamic light scattering of healthy and malaria-parasite invaded red blood cells

YongKeun Park, Monica Diez-Silva, Dan Fu, Gabriel Popescu, Wonshik Choi, Ishan Barman, Subra Suresh, Michael Feld

JBO, Vol. 15, Issue 02, 020506, (March 2010) https://doi.org/10.1117/12.10.1117/1.3369966

KEYWORDS: Light scattering, Scattering, Dynamic light scattering, Blood, Spectroscopy, Microscopy, Fourier transforms, Optical testing, Laser scattering, Scatter measurement

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Proceedings Article | 26 February 2010 Paper

Paper

Spectroscopic phase microscopy for quantifying hemoglobin concentrations in intact red blood cells

YongKeun Park, Toyohiko Yamauchi, Wonshik Choi, Ramachandra Dasari, Michael Feld

Proceedings Volume 7568, 756812 (2010) https://doi.org/10.1117/12.842813

KEYWORDS: Molecules, Phase measurement, Microscopy, Spectroscopy, Blood, Scanning probe microscopy, Proteins, Imaging spectroscopy, Molecular spectroscopy, Diffraction

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Proceedings Article | 25 February 2010 Paper

Paper

Speckle-field digital holographic microscopy

YongKeun Park, Wonshik Choi, Zahid Yaqoob, Ramachandra Dasari, Kamran Badizadegan, Michael Feld

Proceedings Volume 7568, 75681O (2010) https://doi.org/10.1117/12.842799

KEYWORDS: Speckle, High power microwaves, Speckle pattern, Digital holography, Holography, Microscopy, 3D image processing, Digital image correlation, Live cell imaging, Objectives

Read Abstract +

Showing 5 of 20 publications

Conference Committee Involvement (21)

Biomedical Imaging and Sensing Conference

21 April 2025 | Yokohama, Japan

Adaptive Optics and Wavefront Control for Biological Systems XI

26 January 2025 | San Francisco, California, United States

Optics and Photonics International Congress 2024

22 April 2024 | Yokohama, Japan

Adaptive Optics and Wavefront Control for Biological Systems X

28 January 2024 | San Francisco, California, United States

Biomedical Imaging and Sensing Conference

17 April 2023 | Yokohama, Japan

Adaptive Optics and Wavefront Control for Biological Systems IX

29 January 2023 | San Francisco, California, United States

Adaptive Optics and Wavefront Control for Biological Systems VIII

24 January 2022 | San Francisco, California, United States

Biomedical Imaging and Sensing Conference

20 April 2021 | Online, Japan

Adaptive Optics and Wavefront Control for Biological Systems VII

6 March 2021 | Online Only, California, United States

Biomedical Imaging and Sensing Conference

22 April 2020 | Yokohama, Japan

Adaptive Optics and Wavefront Control for Biological Systems VI

2 February 2020 | San Francisco, California, United States

Optical Coherence Imaging Techniques and Imaging in Scattering Media

25 June 2019 | Munich, Germany

Biomedical Imaging and Sensing Conference

23 April 2019 | Yokohama, Japan

Adaptive Optics and Wavefront Control for Biological Systems V

3 February 2019 | San Francisco, California, United States

Biomedical Imaging and Sensing Conference

25 April 2018 | Yokohama, Japan

Adaptive Optics and Wavefront Control for Biological Systems IV

27 January 2018 | San Francisco, California, United States

Optical Coherence Imaging Techniques and Imaging in Scattering Media II

25 June 2017 | Munich, Germany

Biomedical Imaging and Sensing Conference

19 April 2017 | Yokohama, Japan

Adaptive Optics and Wavefront Control for Biological Systems III

28 January 2017 | San Francisco, California, United States

Adaptive Optics and Wavefront Control for Biological Systems II

13 February 2016 | San Francisco, California, United States

Adaptive Optics and Wavefront Control for Biological Systems

7 February 2015 | San Francisco, California, United States

Showing 5 of 21 Conference Committees

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