Papers Published

1. L. Tang and T. Yoshie, Three-Dimensional Photonic Crystal Waveguides and Resonators by Unit Cell Size Modulation, Proceedings of SPIE, vol. 6901 (January 28, 2008), pp. 690118 [GetabsServlet] .
   (last updated on 2008/04/20)

   Abstract:
   The Cu-based interconnect is a major bottleneck for sustaining technological advances in semiconductor integrated circuits. Matured optics technology may be able to resolve this challenge. Optics can provide high-speed, wavelength-division-multiplexing signals with the capability of interfacing optics with electronics through EO and OE conversion—directly-modulated laser, external modulator, and photodiode. An optical waveguide is a major building block for optical interconnects technology. A three-dimensional photonic crystal may provide single-mode, low-loss, group-velocity-dispersionless, compact waveguides. We report designs of double-heterojunction optical waveguides in a three-dimensional photonic crystal. Compact optical waveguide modes are induced by modulating unit cells one-dimensionally or two-dimensionally. One way to do this is to modulate the unit cell size. A well-type waveguide structure is formed by modulating the lattice constant of woodpile in one direction. For some 1D double-heterojunction geometries, light propagation becomes non-dispersive in the space domain, i.e. light is self-collimated along certain directions within the well plane. Next, two-dimensional unit-cell-modulation is applied to a 3D photonic crystal for exciting wire-type waveguide modes, for which light propagates along the horizontal or vertical wire. As a result, light can be guided in the same level or into different levels. The propagation properties, such as propagation loss, group velocity, and waveguide group velocity dispersion, are also analyzed in this work.