Signals and systems perspective of nanoscopic science and technology

Any process occurring in mother nature can be considered as a function of time, thereby pointing either directly or indirectly towards one or another form of signal processing. It is a well known fact that the output signal of any given system is a transformed version of the applied input signal. This transformation from the input signal to the output signal depends mainly on the properties of the concerned system. Thus by manipulating the given system properties, one can obtain the required output. When the behaviour of a system pertaining to its structure, dynamics or properties is subjected to drastic change over its physical dimensions in the scale of 1nm to 100nm, nanoscopic science is born.

Among the various techniques that are used to study mother nature, optical instrumentation is found to prevail in general, mainly due to the ability of man to thoroughly understand the nature of electromagnetic waves at optical frequencies. Thus by using the concept of light as a probe to gain insight into the various structural and dynamic properties of matter present in nature, one can clearly interpret various physical laws and relationships pertaining to nature. This is due to the fact that the energy of light is found to lie within the energy range of electronic and vibrational changes in matter. Hence light can be considered as an effective tool for signal processing in general. It is no wonder that extensive research is being pursued in the study of light.

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