Liquid Crystal Devices in Optical Systems

 Journal Papers

  1. N. A. Riza, “A compact high performance optical control system for phased array radars,”IEEE Photonics Tech. Lett., Vol.4, No.9, pp.1073-1076, Sept., 1992.

  2. N. A. Riza, “Liquid crystal-based optical control of phased array antennas,”IEEE /OSA  Journal of Lightwave Technology, Vol.10, No.12, pp. 1974-1984, Dec., 1992.

  3. N. A. Riza, J. E. Hershey, and A.  A. Hassan “A signaling system for multiple access laser communications and interference protection”Applied Optics ,  Vol. 32, No. 11, pp. 1965-1972, April 10, 1993.

  4. N. A. Riza, “Acousto-optic liquid crystal analog beamfomer for phased array antennas,” Applied Optics ,Vol. 33, No.17, pp. 3712-3724, June 10, 1994.

  5. N. A. Riza and M. C. DeJule, “Three terminal adaptive nematic liquid crystal lens device” Optics Letters, Vol.19, No.14, pp. 1013-15, July, 1994.

  6. N. A. Riza, “Liquid crystal-based optical time delay units for phased array antennas,” IEEE /OSA  Journal of Lightwave Tech , Vol.12, No.8, August, 1994.

  7. N. A. Riza, “High optical isolation low loss moderate switching speed nematic liquid crystal optical switch,”Optics Letters, Vol. 19, No.8, pp.1780-1782, 1994.

  8. Amer A. Hassan, John E. Hershey, and Nabeel A. Riza, “Spatial Optical CDMA,”IEEE  Journal on Selected Areas of Communications, Vol.13, No.3, pp.609-613, April 1995.

  9. N. A. Riza, “25-Channel Nematic Liquid Crystal Optical Time Delay Unit Characterization,” IEEE Photon. Tech.  Letters, Vol.7, No.11, pp.1285-1287, Nov., 1995.

  10. N. A. Riza and N. Madamopoulos, “ Characterization of a ferroelectric liquid crystal based time delay unit for phased array antenna applications,” IEEE /OSA  Journal of Lightwave Tech , Vol.15, No.7, pp.1088-1094, July, 1997.

  11. N. Madamopoulos and N. A. Riza, “Directly modulated semiconductor laser fed photonic delay line with ferroelectric liquid crystals,” Applied Optics, Vol.37, No.8, pp.1407-1416, March 10, 1998.

  12. N. A. Riza and Shifu Yuan, “ Demonstration of a liquid crystal adaptive alignment tweeker for high speed infrared band fiber-fed free-space systems,” Optical Engineering, Vol.37, No.6,  June, 1998.

  13. N. A. Riza and Shifu Yuan, “ Low Optical Interchannel Crosstalk, Fast Switching Speed, Polarization Independent 2x2 Fiber Optic Switch using Ferroelectric Liquid Crystals,” Electronics Letters, Vol.34, No.13,  25th June, 1998.

  14. N. A. Riza and N. Madamopoulos, “Photonic delay line using electrically switched gratings in polymer dispersed liquid crystals,” Optical Engineering, Vol.37, No.11, pp.3061-3065, Nov. 1998.

  15. N. Madamopoulos and N. A. Riza, “Polarization Sensitive Hologram-based Photonic delay lines,” Optics Communications, Vol. 157, pp.225-237, 1 Dec., 1998.

  16. N. A. Riza, “ Sensor Controls See the Light,” IEEE Circuits and Devices Magazine, pp.14-21, May 1999. (INVITED)

  17. N. A. Riza and Shifu Yuan, “ Reconfigurable wavelength add-drop filtering based on a Banyan network topology and ferroelectric liquid crystal fiber-optic switches,” IEEE/OSA Journal of Lightwave Tech., Vol.17, No.9, Sept. 1999.

  18. N. Madamopoulos and N. A. Riza, "Demonstration of an all-digital 7-bit 33-channel photonic delay line for phased-array radars," Applied Optics, Vol. 39, No. 23, pp. 4168 -   4181, 10 August 2000.

  19. N. Madamopoulos and N. A. Riza, "All-fiber connectorized compact fiber optic delay-line modules using three-dimensional polarization optics," Optical Engineering, Vol. 39, No. 9, pp. 2338-2344, September 2000.

  20. S. Sumriddetchkajorn, N. A. Riza and D. K. Sengupta, “Liquid crystal-based self-aligning 2×2 wavelength routing module,” Optical Engineering, Vol. 40, Issue 8, August 2001, pp.1521-1528

  21. N. A. Riza and Sajjad A. Khan, “ Polarization multiplexed optical scanner,” Optics Letters, Vol.28, No.7, pp.561-163, April 1, 2003.

  22. N. A. Riza, S. A. Khan, M. A. Arain, “ Flexible beamforming for optically controlled phased array antennas,” Optics Communications, Vol.227, pp.301-310, 2003.

  23. S. A. Khan and N. A. Riza, "Demonstration of 3-dimensional wide angle laser beam scanner using liquid crystals," Opt. Express 12, 868-882 (2004),
    http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-5-868

  24. N. A. Riza and D. Jorgesen, "Minimally Invasive Optical Beam Profiler," Opt. Express 12, 1892-1901 (2004), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-9-1892

  25. N. A. Riza and S. A. Khan, " Liquid Crystal Deflector-based Variable Fiber-Optic Attenuator ", Applied Optics, Vol. 43, No.17, 3449-3455, June 2004.

  26. N. A. Riza and N. Madamopoulos, “ Compact switched retroreflection-based 2x2 optical switching fabric for WDM applications”, IEEE/OSA Journal of Lightwave Technology, Vol.23, No.1, pp.247-259, Jan. 2005.

  27. N. A. Riza and S. A. Khan, “Ultra-low loss laser communications technique using smart beamforming optics,” Optics Communications, Vol. 257, Issue 2, pp. 225-246, 15 January 2006.

  28. N. A. Riza and S. A. Khan, Erratum to “Ultra-low loss laser communications technique using smart beamforming optics” [Opt. Commun. 257 (2) (2006) 225–246], Optics Communications, Vol. 259, Issue 2, pp.888-890, 15 March 2006.

  29. N. A. Riza and S. A. Khan, “ Wavelength tunable variable fiber optic attenuator using liquid crystal-mirror hybrid controls,” IEEE Photon. Tech. Lett., Vol.17, No.3, pp.621-623, March 2005.

  30. S. A. Khan and N. A. Riza, “Demonstration of a No-Moving-Parts Axial Scanning Confocal Microscope Using Liquid Crystal Optics,” Optics Communications, to appear 2006.

 Patents

  1. N. A. Riza and S. A. Khan, “ Wavelength tunable variable fiber optic attenuator using liquid crystal-mirror hybrid controls,” IEEE Photon. Tech. Lett., Vol.17, No.3, pp.621-623, March 2005.

  2. N.A. Riza, “Reversible time delay beamforming optical architecture for phased array antennas,” U.S.A. Patent No. 5,117,239, May 26, 1992.

  3. N.A. Riza, “Reversible time delay beamforming optical architecture for phased array antennas,” European Patent No. 92303635.4, July 07, 1992.

  4. N. A. Riza, “Time multiplexed phased array antenna beam switching system,” U.S.A. Patent No. 5,231,405, July 27, 1993.

  5. N. A. Riza, “Optical time delay units for phased array antennas,” U.S.A. Patent No.5,274,385, Dec.28, 1993.

  6. N. A. Riza, “An optically controlled phased array radar,” U.S.A. Patent 5,307,073, April 26, 1994.

  7. M. C. DeJule, T. L. Credelle, N. A. Riza, and D. E. Castlebery, “Compact polarization independent optical switching units,” U.S.A. Patent No. 5,319,477, June 7, 1994.

  8. M. C. DeJule, T. L. Credelle, N. A. Riza, and D. E. Castlebery, “ “Compact polarization dependent optical switching units,” U.S.A. Patent No. 5,345,321, Sept. 06, 1994.

  9. M. C. DeJule, N. A. Riza, D. E. Castlebery, and T. L. Credelle, “Optical interferometric device with spatial light modulators for switching substantially coherent light,” U.S.A. Patent No. 5,373,393, Dec. 13, 1994.

  10. N. A. Riza and M. C. DeJule, “High signal-to-noise ratio optical signal processing system,” U.S.A. Patent No. 5,400,038, March 21, 1995.

  11. N. A. Riza, D. E. Castleberry, T. L. Credelle, and M. C. DeJule “Interferometric spatial switch for polarized or unpolarized light using liquid crystal,” U.S.A. Patent No.5,477,350, Dec. 19, 1995.

  12. N. A. Riza, “Fast switching liquid crystal switching unit,” USA Patent No. 5,568,286, Oct.22, 1996.

  13. M. C. DeJule and N. A. Riza, “Programmable liquid crystal wavefront device,” USA Patent No. 5,594,565, Jan.14, 1997.

  14. M. C. DeJule and N. A. Riza, “Three terminal liquid crystal lens cell,” USA Patent No. 5,617,109, April 1, 1997.

  15. N. A. Riza, “Compact optical controller for phased array systems,” USA Patent No. 5,731,790, March 24, 1998.

  16. N. A. Riza, “ Polarization-based fiber-optic switch,” Patent No. 6,360,037, March 19, 2002.