Photonic crystal bend and applications

Off-Plane Adjustment for Waveguide in Woodpile Structure

“…It is known that the adjustment for waveguide in two dimension PCs is only limited to an in-plane design. For example, the guide band can be effectively improved by adjusting the parameters of the rods or holes located on both sides of waveguide, such as changing the radius, adding certain rods or holes in bend location, shifting the location of rods or holes [19][20][21][22][23]. In woodpile structure, dielectric constant is also periodical along the stacking direction.…”

Design and performance of novel communication system using two-dimensional photonic crystals

“…This periodicity can be broken to achieve photonic states within the PBG [7]. In this case, the photons or resonance modes in PC are controlled, redirected, localized with the existence of defects (point or line defect) [8,9]. The generation of these resonances is achieved by altering the M a n u s c r i p t dimension, position and form of the dielectric rods.…”

Optical transformation design of waveguide bends and splitter in photonic crystals

“…Photonic crystals offer a way to eliminate radiation losses and thereby open the possibility of designing wideangle bends and branches with near-complete transmission. Various alternative approaches for waveguide bender and splitter design in photonic crystals have been theoretically or experimentally investigated, e.g., placing extra rods between the input and output waveguides or adjusting the positions of the rods or air holes at the bending region [6][7][8][9][10][11][12], introducing an annular groove into the bending corner [13], using circular photonic crystals to form a bend [14], and utilizing ring resonators to couple to the input and output waveguides [15]. Most of these investigations are based on optimization methods, and the bandwidth of high transmission is also limited to a narrow range.…”