Dr. Hongwen Ren

Research Scientist
(407) 823-4965 - Phone
(407) 823-6880 - Fax
hren@mail.ucf.edu
University of Central Florida
School of Optics - CREOL
4000 Central Florida Boulevard
PO Box 162700
Orlando, Florida 32816-2700

Educational History

1. H. Ren, S. T. Wu, and Y.-H Lin, "In-situ observation of fringing field-induced phase separation in a liquid crystal and monomer mixture", will appear in Physical Review Letter.
2. H. Ren and S. T .Wu," Tunable-focus liquid microlens array using dielectrophoretic effect", Optics Express, 16 2646(2008).

2007

1. H. Ren, D. Fox, B. Wu, and S. T. Wu, " Liquid crystal lens with large focal length tunability and low operating voltage", Optics Express, 15, 11328(2007).
2. H. Ren, S.-T. Wu, and Y.-H. Lin, "Single glass substrate liquid crystal device using electric field enforced phase separation and photoinduced polymerization", Appl. Phys. Lett.90 191105 (2007).
3. H. Ren and S.-T. Wu, " Variable-focus liquid lens", Opt. Express, 15, 5931(2007)
4. H. Ren and S.-T Wu," A liquid crystal-based linear polarization rotator", Appl. Phys. Lett. 90, 121123-1(2007).

2006

1. H. Ren and S.-T. Wu, " Adaptive liquid crystal lens with large focal length tunability", Opt. Express, 14, 11292(2006)
2. H. Ren, D. Fox, P. Phillips, B. Wu, and S. T. Wu, " Tunable-focus liquid lens controlled using a servo motor", Opt. Express, 14, 8031(2006).
3. H. Ren, Y.-H Lin, and S.-T. Wu, " Linear to axial or radial polarization conversion using a liquid crystal gel"  Appl Phys. Lett. 89, 051114(2006).
4. H. Ren, Y.-H Lin, and S.-T. Wu, " An adaptive lens using liquid crystal concentration redistribution", Appl. Phys. Lett. 88, 191116-1(2006).
5. H. Ren, Y.-H. Lin, and S.-T. Wu, " Polarization-independent and fast-response phase modulators using double-layered liquid crystal gels", Appl. Phys. Lett. 88, 061123-1(2006).
6. H. Ren, Y. H. Lin, and S. T. Wu, "Flat polymeric microlens array", Opt. Comm. 261, 296 (2006)

2005

1. J. Li, G. Baird, Y. H. Lin, H. Ren, and S. T. Wu, “Refractive index matching between liquid crystals and photopolymers" , J. SID 13, 1017-1026 (Dec. 2005).
2. H. Ren, Y. H. Lin, C. H. Wen, and S. T. Wu, “Polarization-independent phase modulation of a homeotropic liquid crystal gel", Appl. Phys. Lett.  87, 191106 (Nov. 7, 2005).  
3. Y. H. Lin, H. Ren, S. Gauza, Y. H. Wu, Y. Zhao, J. Fang, and S. T. Wu, "IPS-LCD using a glass substrate and an anisotropic polymer film", J. Display Technology 2, (March, 2006).
4. H. Ren, S. T. Wu,"Polymer-based flexible microlens arrays with hermaphroditic focusing properties", Appl. Opt. 44, 7730-7734(2005).
5. Y. H. Lin, H. Ren, Y. H. Fan, Y.-H. Wu, and S. T. Wu, " Polarization-independent and fast-response phase modulation using a normal-mode polymer-stabilized cholesteric texture" J. Appl. Phys, 98, (2005).
6. Y. H. Wu, Y. H. Lin, H. Ren, X. Nie, J. H. Lee, and S. T. Wu, “Axially-symmetric sheared polymer network liquid crystals" , Opt. Express  13, 4638 (June 13, 2005)
7. Y.-H. Fan, H. Ren, and S. T. Wu," Electrically switchable Fresnel lens using a polymer-separated composite film", Optics Express, 13, 4141(2005).
8. H. Ren, J. Wu, and S. T. Wu, "Phase-only modulation using a normal-mode liquid crystal gel", J. Appl. Phys, 98 (2005).
9. H. Ren and S. T. Wu, "Variable-focus liquid lens by changing aperture", Appl. Phys. Lett. 86, 211107(2005)
10. H. Ren, Y.-H. Lin, F-H  Fan and S. T. Wu, " Polarization-independent phase modulation using a polymer-dispersed liquid crystal", Appl. Phys. Lett. 86, 141110(2005)
11. Y. H. Lin, H. Ren, Y. H. Wu, X. Liang and S. T. Wu, " Pinning effect on the phase separation dynamics of thin polymer-dispersed liquid crystals" Optics Express 13, 468 (2005).
12. H. Ren, Y. H. Fan, Y. H. Lin, and S. T. Wu, “ Tunable-focus microlens arrays using nanosized polymer-dispersed liquid crystal droplets”, Optics Communications, 247, 101 (2005).
13. H. Ren, Janet R. Wu, Y.-H. Fan, Y.-H. Lin, and S.-T. Wu “Hermaphroditic liquid-crystal microlens” , Optics Letters, 30, 376 (2005).

2004

1. Y.-H. Wu, Y-H. Lin, Y. Lu, H. Ren, Y.-H. Fan, J. R. Wu and S.-T. Wu ”Submillisecond response variable optical attenuator based on sheared polymer network liquid crystal”, Optics Express, 12, 6382,(2004).
2. Y. H. Lin, H. Ren, K. H. Fang-Chiang, W. K. Choi, S. Gauza, X. Zhu and S. T. Wu, “Tunable-focus cylindrical liquid crystal lenses”, Jpn. J. Appl. Phys, 44, 243 (2005).
3. Y. H. Fan, H. Ren, X. Liang, Y. H. Lin, and S.T. Wu, “Dual-frequency liquid crystal gels with sub-millisecond response time”, Appl. Phys. Lett. 85, 2451(2004).
4. P. T. Lin, X. Liang, H. Ren, and S. T. Wu,” Tunable diffraction grating using ultraviolet-light-induced spatial phase modulation in dual-frequency liquid crystal” , Appl. Phys. Lett. 85, 1131(2004).
5. H. Ren, Y. Lin, Y. Fan and S.-T. Wu, " In-plane switching liquid crystal gel for polarization-independent light switch" J. of Appl. Phys. 96,3609 (2004).
6. H. Ren, Y. H. Fan, S. Gauza, and S.T. Wu, " Tunable-focus flat liquid crystal spherical lens", Appl. Phys. Lett. 84, 4789 (2004)
7. Y-H. Lin, H. Ren, S-T. Wu," High contrast polymer dispersed liquid crystal in a 90o twist cell", Appl. Phys Lett. 84,4083 (2004).
8. H. Ren, Y. H. Fan, and S. T. Wu," Liquid crystal microlens arrays using patterned polymer networks", Optics Letters, Vol 29, 1608 (2004).
9. Y. H. Fan, Y. H. Lin, H. Ren, S. Gauza and S. T. Wu, “Fast-response and scattering-free polymer network liquid crystals for infrared light modulators,” Appl. Phys. Lett. 84, 1233 (2004).
10. H. Ren, Y. H. Fan. and S. T. Wu, “Polymer network liquid crystals for tunable microlens arrays,” J. Phys. D: Appl. Phys. 37, 400 (2004).
11. H. Ren, Y. H. Fan, S. Gauza and S. T. Wu, “Tunable microlens arrays using polymer network liquid crystal,” Optics Comm. 230, 267 (2004).
12. H. Ren, Y. H. Fan. S. Gauza and S. T. Wu, “Tunable-focus cylindrical liquid crystal lens,” Jpn. J. Appl. Phys. 43, 652 (2004).

2003

1. Y. H. Fan, H. Ren and S. T. Wu, "Switchable Fresnel lens using polymer-stabilized liquid crystals," Optics Express 11, 3080(2003).
2. H. Ren, Y. H. Fan and S. T. Wu,  “Tunable Fresnel lens using nanoscale polymer-dispersed liquid crystals”, Appl. Phys. Lett. 83, 1515 (2003)
3. H. Ren, Y. H. Fan and S. T. Wu, “A prism grating using polymer-stabilized liquid crystal”, Appl. Phys. Lett. 82, 3168 (2003).
4. Y. H. Fan, H. Ren and S. T. Wu, “Normal mode anisotropic liquid crystal gels”, Appl. Phys. Lett. 82, 2945 (2003).
5. H. Ren and S-T.Wu, "Tunable electronic lens using polymer network liquid crystals", Appl. Phys. Lett. 82, 22-24 (2003).

2002

1. H. Ren and S-T Wu,"Inhomogeneous nanoscale polymer-dispersed liquid crystals with gradient refractive index", Appl.Phys.Lett. 81,3537 (2002).
2. H. Ren and S-T Wu, "Anisotropic liquid crystal gels for switchable polarizers and displays", Appl. Phys. Lett 81, 1432 (2002)
3. H. Ren and S.-T. Wu, "Reflective reverse-mode polymer stabilized cholesteric texture light switches" J. Appl. Phys 92, 797 (2002)

2001

1. H. Ren, Fang Kun, Li Xuan, and Ximin Huang, "Interference Patterns Storing in Holographic Polymer Dispersed Liquid Crystals(HPDLC) and its Diffraction Properties", Chinese Journal of Liquid Crystals and Displays 16, 16 (2001)

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1. H. Ren, D. W. Fox, and S. T. Wu, "Liquid crystal and liquid lenses for displays and image procesing", SID'07, p1733(2007), invited talk.
2. Y. H. Fan, Y. H. Lin, H. Ren, S. Gauza and S. T. Wu, “Fast-response polymer network liquid crystals for optical communications”, SID Tech. Digest 35, 1526-9 (2004).
3. Y. H. Fan, H. Ren, and S. T. Wu, “Electrically controlled lens and prism using nanoscale polymer-dispersed and polymer- networked liquid crystals,” (Invited paper) Proc. SPIE (In press, 2004).
4. Y.-P. Huang, X. Zhu, H. Ren, Q. Hong, T. X. Wu, S.-T. Wu, S.-H. Lin and H.-P. David Shieh, " Full-Color Trsnsflective Ch-LCD with Image-Enhanced Reflector", SID Tech. Digest 35, 882-5(2004).
5. Y.-H. Lin, H. Ren and S.-T. Wu," Twisted PDLC for High-Contrast reflective Display,” SID Tech. Digest 35, 614-7 (2004).
6. H. Ren, Y. H. Fan and S. T. Wu, "Anisotropic liquid crystal gels for display applications", (Invited Paper) Proc. International Display Manufacturing Conference, pp. 29-32 (2003).
7. H. Ren, S. Gauza and S. T. Wu,  “A High Contrast and Low Voltage PSCT Reflective Display”, SID Tech. Digest 34, 641-3 (2003).

1. Hongwen Ren and Shin Tson WU, "Liquid Zoom" Scientific American"  October 27, 2007, P30
2. H. Ren, Y.-H. Fan, Y.-H. Lin, and S.-T. Wu, ”Electrically controlled liquid crystal yields tunable-focus-length lenses.” Sep. 2004

1.  H. Ren, Y.-H. Fan, and S.-T. Wu, "Tunable Liquid Crystal Electronic Lens" to be published in " Springer Handbook of Lasers and Optics" . ISBN# 0-387-95579-8. Publisher: Springer-Verlag Berlin Heidelberg New York

1. H. Ren and S. T. Wu," Tunable electronic lens and Prisms using inhomogeneous nano scale liquid crystal droplets, US 7,327,434 B1.(2008)
2. H. Ren ans S. T. Wu," Variable focus liquid lens, UCF-614 (Pending)
3. H. Ren and S. T. Wu," Tunable Electronic Lens and Prisms using inhomogeneous nano scale liquid crystal droplets", US 7,042,549 B1
4. H. Ren and S. T. Wu," Variable focus liquid lens"   US 7,142,369
5. Y. Huang, H. Ren, X.  Zhu and S. T. Wu, "Electrically Tunable Polarization-independent  Microlens Using  Polymer Network 90  Twisted Nematic Liquid Crystal", US 7,079,203 B1
6. Y.-P. Huang, X. Zhu, H. Ren, T. Wu and S. T. Wu,” Full Color Transflective Cholesteric Liquid Crystal Display with Slant Reflectors above Transmissive Pixels, US 7027,118.
7. H. Ren, Y.-H. Fan, and Shin-Tson Wu," Adaptive Liquid Crystal Lenses" US 6859333.
8. H. Ren and S.-T. Wu, "Tunable electronic lens using nano-scale polymer dispersed liquid crystals" US 6,864,951

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