Abstract
In this paper, we have designed an all-optical controllable gas detector by doping 3-level Λ type nanocrystals in the moving arms' mirror of Michelson interferometer and used electromagnetically induced transparency (EIT) phenomenon to change its refractive index. By this means, we have created a controllable phase difference between light beams in two arms of the Michelson interferometer, where reflection phase of the EIT-based mirror changes about π radiant. Also, the signal reflection from EIT-based mirror changes between 0% and 100% approximately, while the second arm's signal is reflected completely. This EIT-based mirror's refractive index change can be a good alternative for conventional Michelson interferometer-based gas detector with one mechanical moving arm mirror (Undergraduate Instrumental Analysis, 6th edn. Marcel Dekker, New York, 2005), where long response time and unfix moving speed were its main drawbacks. While, in this scheme, not only these disadvantages are removed but also the response time can reach the electron transient time between the atomic energy levels. Then, by this all-optical tunable gas detector, we have achieved many modifications such as response time in sub-nanoseconds, high resolution, and high accuracy, or less cross sensitivity to other gas species.
Highlights
The hydrogen sulfide (H2S) is a colorless, toxic, and flammable gas, which is partially responsible for the foul odor of rotten eggs
It is well known that increasing the control field intensity broadens the electromagnetically induced transparency (EIT) window; the slope of the refractive index decreases
Valuable researches have been done on EIT, and its applications have been extended approximately to all fields of optics
Summary
The hydrogen sulfide (H2S) is a colorless, toxic, and flammable gas, which is partially responsible for the foul odor of rotten eggs. It often results from the bacterial break down of sulfates in organic matter in the absence of oxygen, such as in swamps and sewers. It occurs in volcanic gases, natural gas, and some well waters [1,2]. Small amounts of hydrogen sulfide occur in crude petroleum, but natural gas can contain up to 90%. Normal concentration of the H2S in clean air is about 0.0001 to
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