Abstract
Generic modeling and analysis of a slow-light enhanced absorption spectroscopic gas sensor was proposed, using a mode-tuned, hollow-core, photonic band-gap fiber (HC-PBF) as an absorption gas cell. Mode characteristics of the un-infiltrated and infiltrated HC-PBF and gas absorption enhancement of the infiltrated HC-PBF were analyzed. A general rule of microfluidic parameters for targeting different gas species in the near-infrared was obtained. Ammonia (NH3) was used as an example to explore the effects of slow light on gas detection. The second harmonic (2f) signal and Allan deviation were theoretically investigated based on the derived formulations.
Highlights
The sensitive and selective detection of trace chemicals is important for environmental, safety, and industrial process monitoring, as well as in national security applications
In view of the above considerations, as the main focus and novelty of the paper, we propose a a generic design and analysis of a slow-light enhanced absorption spectroscopic gas sensor based design of a slow-light enhanced absorption gas the sensor based on of on generic
Ammonia (NH3) is used as an example to explore the effects of slow light on gas detection as a reference in the design and development of such kind of effects of slow light on gas detection as a reference in the design and development of such kind of gas gas sensors
Summary
The sensitive and selective detection of trace chemicals is important for environmental, safety, and industrial process monitoring, as well as in national security applications. HC-PBF of sensors have unique are a wideofvariety of gas sensors based on HC-PBFs PHC for the different gas speciesdispersive or for properties that allow for the control and manipulation of light-matter interactions on the length scale the application of different signal processing techniques. C is Itheis gas is the optical length; and coefficient γ is a wavelength-dependent, where the concentration; incident lightLintensity; α(λ) interaction is the gas absorption at the wavelength of medium-specific absorption enhancement factor, due to slow-light effect in dispersive structures. WMS is used as an example, to show how this enhancement will affect the second harmonic signal This technique requires that the emitting wavelength of the laser must be stabilized, in order to be the peak absorption wavelength for a certain gas molecule. Int integral factor,ofdetermined by the cutoff Band‐Gap frequency of the related low-pass filter
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