In this paper a novel all-optical logic NAND, NOR and XOR gate based on nonlinear directional coupler theory is demonstrated. We use the identical structure which contains three waveguides, for designing these gates; the only difference however, is the power of inputs light beam. In other words, while a beam with 4 W/μm in power considered as logical one, the output is NAND gate and if a beam w...

In this paper a novel all-optical logic NAND, NOR and XOR gate based on nonlinear directional coupler theory is demonstrated. We use the identical structure which contains three waveguides, for designing these gates; the only difference however, is the power of inputs light beam. In other words, while a beam with 4 W/μm in power considered as logical one, the output is NAND gate and if a beam w...

The Geant4 Application for Emission Tomography (GATE) is an advanced open-source software dedicated to Monte-Carlo (MC) simulations in medical imaging involving photon transportation (Positron emission tomography, single photon emission computed tomography, computed tomography) and in particle therapy. In this work, we extend the GATE to support simulations of optical imaging, such as biolumine...

A theoretical model for the I-V characteristics of buried-gate GaAs metal semiconductor field-effect transistors has been developed by solving dc continuity equation. This analysis includes the ion implanted buried-gate process. It is shown that the currentvoltage could be rather increased when introducing an optical fiber to the buried-gate GaAs MESFETs structure. The current -voltage characte...

We experimentally demonstrate an all-optical binary counter composed of four semiconductor optical amplifier based all-optical switching gates. The time-of-flight optical circuit operates with bit-differential delays between the exclusive-OR gate used for modulo-2 binary addition and the AND gate used for binary carry detection. A movie of the counter operating in real time is presented.

In the recent years reversible logic design has promising applications in low power computing, optical computing, quantum computing. VLSI design mainly concentrates on low power logic circuit design. In the present scenario researchers have made implementations of reversible logic gates in optical domain for its low energy consumption and high speed. This study is all about designing a reversib...

We have successfully fabricated 0.1 μm gate GaAs MESFETs using a low cost process. The result was obtained from optical lithography, resist etching, and ion-implantation technologies based on Single Resist layer Dummy gate (SRD) process. The novel feature of the SRD process is forming a sub-quarter micron gate with conventional optical lithography. We have obtained a 0.18 μm gate using this pro...

Optical logic gates play important roles in all-optical circuits, which lie at the heart of next-generation optical computing technology. However, intrinsic contradiction between compactness and robustness hinders development this field. Here, we propose a simple design principle that can possess multiple-input-output states according to incident circular polarization direction based on metasur...