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Novel optical nano-sensor for biomolecule and chemical agents detection

A novel photonic band-gap (PBG) based nano-sensor is proposed for biomolecule gas/chemical agents, and various industrial gas detections. The proposed sensor is based on the plannar waveguide formed by utilizing the PBG. Sensor structure is optimized for a fixed wavelength of light and fixed recpetor. Biomolecule gas adsorbed/interact with the receptor, cause changes in refractive index, which thereby reduces the output optical power. Type of gas and its density in the air can be known from the changes in output optical power, compared with no-gas (reference) adsorption. The proposed sensor can able to detect the fixed gas in several tens of parts-per-billion. We will present detailed simulation and the results of this proposed sensor for various biomolecule gas/chemical agents and also industrial gases. In addition to biomolecule gas/chemical agents detection, the proposed nano-sensor is also expected to be useful for various applications for example in clinical diagnostic system to measure the specific cell or DNA.