Archive for February 2016

Future of Photonics in Technology by Dr. Anup Maiti, Dept. of Physics

Technology provides people all over the world with much better ways of communication than ever before and the situations are rapidly changing from messages to movies. The field of computation and information processing is growing day by day. Massive parallelism, speed of operation, increased spatial density is the areas which attract in many ways the scientists, researchers and technologists. Information and image processing with photon as information carrier seems to have very high potentiality through the researches in this area in last few decades. Performing computations with light is an exciting idea and has been transformed to reality through various technological applications. It is needless to surface that photons play an important role for transferring information and doing some low-level information processing. Current researches concerning nonlinear material (NLM) based ultra-fast all-optical switches and detectors along with quantum mechanical properties of photons have led to a renewed interest in optical processing. Owing to huge growth of information traffic, one requires large bandwidth coupled with less dispersion and low attenuation. Optical fiber communication in selective window of operational wavelength can address the related requirement which is around THz range. As photon has the speed of light and zero mass as well, the technique of computing with light may bring out some inference about computational limitations of speed and complexity inherent in electronics based computing.


In recent years, reversible logic has emerged as a potential candidate having application in low power CMOS, quantum computing, nanotechnology, and optical computing etc. Side by side, reversible logic is of increasing importance to computer technologies in future. The circuits that do not lose information are known as reversible circuits and reversible computation can be performed in a system only when the system comprises of reversible gates. These circuits can generate unique vector output from each vector input, and vice versa, that is, there is a one-to-one mapping between input and output vectors. It is relevant to mention in this connection that the classical set of gates such as AND, OR, and EXOR are never reversible as they are all single multiple-input output logic gates.


The area of design of user friendly cost effective and fast reversible logic circuits is being investigated by scientists and technologists and consequently literature is being enriched by novel schemes in different optical domain.


In addition, optical devices have extended their sway in the field of Bio Technology and Medical Sciences and in this context; the optical devices have been proved to be more effective in comparison to the other devices.