Polarization preserving ultra fast optical shutter for quantum information processing.

Ultra-fast 1-bit comparator using nonlinear photonic crystalbased ring resonators

In this paper, a photonic crystal structure for comparing two bits has beenproposed. This structure includes four resonant rings and some nonlinear rods. Thenonlinear rods used inside the resonant rings were made of a doped glass whose linearand nonlinear refractive indices are 1.4 and 10-14 m2/W, respectively. Using Kerr effect,optical waves are guided toward the correc...

Structural, Optical and Ultra-Violet Photodetection Properties of ZnO Nanorods with Various Aspect Ratios

ZnO nanorods with various lengths were synthesized by a two-stage route (by changing the time of growth between 0-240 min) and were characterized using XRD, SEM, UV–Vis and PL techniques. The SEM and XRD results confirmed a fast growth of (0 0 2) plane in the preferential longitudinal orientation, in contrast to lateral growth and therefore, by increasing the time of hydrothermal growth, nanoro...

In-plane switching liquid crystal gel for polarization-independent light switch

An in-plane switching (IPS) liquid crystal (LC) gel for light shutter is demonstrated. In the voltage-off state, the LC gel is transparent. As the voltage exceeds a threshold, light scattering occurs due to microdomain formations. This light scattering is found to be polarization independent. Such an IPS LC gel is a broadband device and has a wide viewing angle and a relatively fast response ti...

Single-photon frequency upconversion for long-distance quantum teleportation and communication

Entanglement generation, single-photon detection, and frequency translation that preserves the polarization quantum state of the photons are essential technologies for long distance quantum communication protocols. This thesis investigates the application of polarization entanglement to quantum communication, including frequency upconversion, photon-counting detection, and photon-pair and entan...

New Approach to Ultra-Fast All-Optical Signal Processing Based on Quantum Dot Devices