Selected Publications (Till 2009)

Journal Publications:

• M. Kumar, C. Chase, V. Karagodsky, T. Sakaguchi, F. Koyama, and C. J. Chang-Hasnain, "Low birefringence and 2-D optical confinement of Hollow waveguide with distributed Bragg reflector and high index contrast grating", IEEE Photonics Journal 1 , No.2, 135 (2009).
• M. Kumar, T. Sakaguchi, and F. Koyama, "Wide tunability and ultralarge birefringence with 3D hollow waveguide Bragg reflector", Optics Letters 34 , No. 8, 1252 (2009).
• M. Kumar, T. Sakaguchi, and F. Koyama, "Giant birefringence and tunable differential group delay in Bragg reflector based on tapered three-dimensional hollow waveguide", Applied Physics Letters 94 , Issue 6, 061112 (2009).
• M. Kumar, T. Sakaguchi, and F. Koyama, "Polarization-insensitive and low-loss 3-D nanostep hollow waveguide for widely tunable photonic devices", IEEE Journal of Lightwave Technology 26 , No. 11, 1417 (2008).
• M. Kumar, T. Sakaguchi, and F. Koyama, "Tunable three-dimensional nanostep hollow optical waveguide with low polarization dependence", Applied Physics Express 1 , 052002 (2008).
• M. Kumar and F. Koyama, "Investigation and theoretical analysis of low-loss 3D hollow waveguides for widely tunable photonic devices", Japanese Journal of Applied Physics 47 , No. 5, 3471-3475 (2008).

International Conference Proceedings:

• M. Kumar, C. Chase, V. Karagodsky, T. Sakaguchi, F. Koyama, and C. J. Chang-Hasnain, "Novel 3D Hollow Optical Waveguide with Lateral and Vertical Periodicity for Tunable Photonic Integrated Circuits", European Conference on Optical Communications (ECOC ) September 2009, Vienna, Austria , P2.16.
• M. Kumar, T. Sakaguchi, A. Matsutani and F. Koyama, "Adjustable polarization mode dispersion compensation using 3D hollow waveguide Bragg reflector", Conference on Laser and Electro Optics (CLEO) June 2009, Baltimore, Maryland, USA , CThB-5.
• M. Kumar, F. Koyama, and C.J. Chang-Hasnain,"2D confinement and reduction of polarization dependence in hollow waveguide with high index contrast grating", Conference on Laser and Electro Optics (CLEO ) June 2009, Baltimore, Maryland, USA , JWA44.
• M. Kumar and F. Koyama, "A tunable 3D hollow waveguide Bragg reflector with giant birefringence and tunable differential group delay", Optical Fiber Conference (OFC ) March 2009, San Diego, California, USA , OWC-3.
• M. Kumar, F. Koyama, and C.J. Chang-Hasnain, "Tunable hollow waveguide with high contrast grating", Annual meeting IEEE-LEOS November 2008, Long beach, California, USA , WN-4.
• M. Kumar, T. Sakaguchi, and F. Koyama, "Widely tunable mirror based on 3D hollow waveguide for tunable photonic integrated circuits", Conference on Laser and Electro Optics (CLEO) May 2008, San Jose, California, USA , CMG-5.

International Conference Papers:

• M. Kumar, T. Sakaguchi, and F.Koyama, "Design and Fabrication of 3D nanostep hollow waveguide for widely tunable photonic devices", Micro Optics Conference (MOC) October 2007, Takamatsu, Japan, C-7.
• M.Kumar, T. Sakaguchi, and F. Koyama, "Polarization insensitive and low loss tunable 3D nanostep hollow waveguide for widely tunable photonic devices", International Nano-Optoelectronics Workshop (INOW) August 2007, Beijing-Lanzhou, China, P2-39.
• M. Kumar, T.Sakaguchi, and F. Koyama, "Polarization insensitive and low loss tunable 3D hollow waveguide for tunable photonic devices", Optoelectronics and Communication Conference (OECC) July 2007, Yokohama, Japan, 13E1-3.
• M. Kumar and F. Koyama,"Modeling of 3D curved hollow waveguide for widely tunable photonic devices", International Conference on Contemporary Photonics Technology (CPT) 2007, Tokyo, Japan, F-3.