Till 2009
- 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).
