Search

We present the design and analysis of a novel reconfigurable photonic-crystal waveguide (PCW). The predefined waveguide is the result of the refractive-index variation of three rows of holes that can be obtained by the infiltration of liquids within what are otherwise air holes in a two-dimensional triangular-lattice photonic crystal. We compute the power transmission through the reconfigurable PCWs as well as through arbitrary waveguide bends. The advantages of writing reconfigurable PCW of a multimode nature are highlighted. We demonstrate the necessity to infiltrate high-refractive-index substances to obtain efficient power transfer via reconfigurable manner. (C) 2008 Optical Society of America.

Ring shaped photonic crystals on SOI slab are studied aiming to search for large complete band gap. A gap to mid-gap ratio (if 7% is successfully obtained., IEEE, Informat Soc Technol, Helios

We present the design and analysis of a novel reconfigurable photonic-crystal waveguide (PCW). The predefined waveguide is the result of the refractive-index variation of three rows of holes that can be obtained by the infiltration of liquids within what are otherwise air holes in a two-dimensional triangular-lattice photonic crystal. We compute the power transmission through the reconfigurable PCWs as well as through arbitrary waveguide bends. The advantages of writing reconfigurable PCW of a multimode nature are highlighted. We demonstrate the necessity to infiltrate high-refractive-index substances to obtain efficient power transfer via reconfigurable manner. (C) 2008 Optical Society of America.

A program of research was carried out in which theoretical investigations into the simultaneous manipulation of carriers (electrons, holes, and ultimately excitons) and light in semiconductor nanostructures such as quantum wells were conducted. The manipulation of the carrier and optical dynamics will be achieved by the use of specially tailored ultrafast optical pulses, multicolor laser fields, millimeter or submillimeter electromagnetic pulses, or combinations of the above. Because the relevant time scale for the carrier dynamics may be less than the characteristic dephasing time of the carriers, the evolution of the system can be coherent; phase effects play a dominant role. Such shaped pulses and multicolor fields may be used to coherently control optical excitations in semiconductors in order to access quantum mechanical states, which are otherwise difficult to attain.

A scheme for ultrahigh-speed all-optical switching based on semiconductor heterostructures was explored theoretically. The approach was anticipated to be applicable to systems operating in the 10 to 100 gigabit/sec regime. Our role was to simulate the carrier dynamics in semiconductor heterostructures under ultrafast (picosecond and subpicosecond) laser excitation. Pulse characteristics were found to coherently populate and depopulate the semiconductor heterostructure of carriers on the picosecond timescale.

A workshop was held in Coeur d'Alene, idaho, 2-4 February 1998 as an Optical Society of America Topical Meeting. The research areas covered by the workshop roughly fell under the heading of ultrafast and coherent nonlinear optical properties of semiconductors; nevertheless, a number of speakers from other fields presented papers at the conference in order to stimulate cross-disciplinary discussion. Approximately thirty papers were presented, and a proceedings was published by the Optical Society of America as a volume in their Trends in Optics and Photonics series. AFOSR funds supported the travel and local expenses of eight invited speakers.