High sensitivity evanescent-field gas sensor based on modified photonic crystal fiber for gas condensate and air pollution monitoring

Olyaee, Saeed; Naraghi, Alieh; Ahmadi, Vahid

doi:10.1016/j.ijleo.2013.07.047

Cited by 105 publications

(62 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A defected hollow high index GeO 2 -doped silica ring is considered at the center of fiber around an air core whose width is varies according to the diameter of air core. In [18], it was shown that the outer cladding had greater impact on confinement loss and sensitivity is greatly depended on the diameter of holes in the inner ring closer to the core region. We observe in our investigation that the diameter of holes in cladding and width of non-circular holes has strong impact on confinement loss.…”

Section: Geometries Of the Proposed Pcfmentioning

confidence: 99%

“…The confinement loss (dB/m) is determined from the imaginary part of effective mode index as follows [18,23] …”

Section: Numerical Analysis and Equationsmentioning

confidence: 99%

“…Beer-Lambert law [18,26] is used to evaluate the absorbance of evanescent field by the gas samples. The relationship between gas concentration and optical intensity is given by the following equation…”

Section: Numerical Analysis and Equationsmentioning

confidence: 99%

“…In this paper, fraction of evanescent field is enhanced by increasing the diameter of central air hole, hence the sensitivity is improved and kept the diameter smaller than cladding holes diameters to physical realization of the effective index guiding. An optimize structure of [14] was proposed in [18] to get the better sensitivity and lower confinement loss. Also, it introduced a new structure with hexagonal holes in the inner ring instead of circular holes to significantly increase the sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, it proposes an optimum structure of prior PCF [18] by introducing four non-circular air holes instead of six hexagonal holes around a hollow high index GeO 2 -doped silica ring to increase the relative sensitivity and to decrease the confinement loss. Figure 1 shows the transverse cross section of the proposed structure which contains five air-hole rings in the cladding.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Enhancement of the sensitivity of gas sensor based on microstructure optical fiber

2015

View full text Add to dashboard Cite

This paper proposes the design and characterization of microstructure optical fiber for gas sensing applications. The aim is to detect toxic and colorless gases over a wide transmission band covering 0.80 m to 2.00 m wavelength. Numerical investigation is carried out by using the finite element method (FEM). The numerical study shows that sensitivity of the proposed sensor is moderately increased by introducing four non-circular holes around the defected core of photonic crystal fiber and the confinement loss is also reduced. Furthermore, we confirm that increasing the diameter of central air core and size of the non-circular holes can improve the relative sensitivity and the confinement loss is reduced by increasing the diameter of air holes in the cladding. The enhancement of the relative sensitivity is more than 27.58% (0.1323 to 0.1688) at the wavelength =1.33m that is the absorption line of methane (CH 4 ) and hydrogen fluoride (HF) gases. The confinement loss of the fiber is 1.765×10 8 dB/m.

show abstract

Section: Geometries Of the Proposed Pcfmentioning

confidence: 99%

“…The confinement loss (dB/m) is determined from the imaginary part of effective mode index as follows [18,23] …”

Section: Numerical Analysis and Equationsmentioning

confidence: 99%

Section: Numerical Analysis and Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhancement of the sensitivity of gas sensor based on microstructure optical fiber

2015

View full text Add to dashboard Cite

show abstract

Selective Detection of Functionalized Carbon Particles based on Polymer Semiconducting and Conducting Devices as Potential Particulate Matter Sensors

Song,

Chen,

Jiang

et al. 2023

Small

View full text Add to dashboard Cite

This paper reports a new mechanism for particulate matter detection and identification. Three types of carbon particles are synthesized with different functional groups to mimic the real particulates in atmospheric aerosol. After exposing polymer‐based organic devices in organic field effect transistor (OFET) architectures to the particle mist, the sensitivity and selectivity of the detection of different types of particles are shown by the current changes extracted from the transfer curves. The results indicate that the sensitivity of the devices is related to the structure and functional groups of the organic semiconducting layers, as well as the morphology. The predominant response is simulated by a model that yielded values of charge carrier density increase and charge carriers delivered per unit mass of particles. The research points out that polymer semiconductor devices have the ability to selectively detect particles with multiple functional groups, which reveals a future direction for selective detection of particulate matter.

show abstract

Whispering Gallery Mode Devices for Sensing and Biosensing

François¹,

Zhi

Meldrum

2015

Photonic Materials for Sensing, Biosensing and Display Devices

View full text Add to dashboard Cite

Optical sensors based on resonant whispering gallery mode (WGM) optical cavities are discussed in the context of recent research developments. WGM-based sensors are among the most sensitive optical sensing devices currently known, especially when combined with surface plasmon effects. The basic theory of WGM "reactive" sensing is first discussed, along with the basic parameters that are used to characterize such devices (i.e., sensitivity, signal-to-noise ratio, and detection limit). Surface chemistry methods are of critical importance for targeted sensing applications and the fundamentals of this aspect are examined. The performance of fluorescent WGM-based devices is compared to state-of-the-art "evanescently-coupled" structures. Finally, the performance of WGM-based optical sensors is compared and contrasted to a range of alternative optical microsensor technologies currently under development.A. François

show abstract

High sensitivity evanescent-field gas sensor based on modified photonic crystal fiber for gas condensate and air pollution monitoring

Cited by 105 publications

References 20 publications

Enhancement of the sensitivity of gas sensor based on microstructure optical fiber

Enhancement of the sensitivity of gas sensor based on microstructure optical fiber

Selective Detection of Functionalized Carbon Particles based on Polymer Semiconducting and Conducting Devices as Potential Particulate Matter Sensors

Whispering Gallery Mode Devices for Sensing and Biosensing

Contact Info

Product

Resources

About