Controlled side coupling of light to cladding mode of ZnO nanorod coated optical fibers and its implications for chemical vapor sensing

Bora, Tanujjal; Fallah, Hoorieh; Chaudhari, Mayur; Apiwattanadej, Thanit; Harun, Sulaiman Wadi; Mohammed, Waleed S.; Dutta, Joydeep

doi:10.1016/j.snb.2014.05.097

Cited by 31 publications

(8 citation statements)

References 21 publications

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“…ZnO has unique optoelectronic properties like direct wide bandgap (3.37 eV) with hexagonal wurtzite structure, large free-exciton binding energy (60 meV), strong cohesive energy of 1.89 eV, high optical gain (300 cm -1 ) and high mechanical and thermal stabilities [1,2]. Due to these exclusive characteristics, it is expected that ZnO has efficient utilization in different scientific and industrial applications such as integrated optical devices, antireflection coatings, liquid crystal displays, light-emitting diodes, laser diodes, chemical sensors, solar cells [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing process in tuning of defects in ZnO nanorods and their application in UV photodetectors

Khayatian

Kashi

Azimirad

et al. 2016

Optik

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ZnO nanorod (NR) arrays were grown by a simple two-step chemical bath deposition method. The as-deposited NRs were then annealed at different temperatures (300, 400 and 500°C) for two time durations (1 and 5 h). The NRs were studied by scanning electron microscopy, photoluminescence spectroscopy, X-ray diffraction and two-point electrical test. Finally, ultraviolet (UV) detection properties of samples as an active layer in UV photodetector devices were evaluated. The structural results showed that the sample annealed at 400°C had the best crystallinity. Furthermore, it was seen that the optical transparency and band gap of NRs increased with increase of the annealing temperature up to 400°C and then decreased at 500°C. The electrical resistance decreases with increment of the annealing temperature due to intensive desorption of oxygen molecules from the surface of ZnO NRs. The UV detection results proved a meaningful relevance of UV detection properties with the density of defects and quantity of oxygen molecules absorbed on the surface. ZnO NRs annealed at 300°C for 1 h had the highest photosensitivity of 300 and photoresponsivity of 2.067 A/W which make it suitable for the practical applications.

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Section: Introductionmentioning

confidence: 99%

Effect of annealing process in tuning of defects in ZnO nanorods and their application in UV photodetectors

Khayatian

Kashi

Azimirad

et al. 2016

Optik

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“…The highest reflectivity can be achieved at 12 h growth time. At 12 h growth time provide increment in length diameter and density distribution compared with 8 and 10 h. Bora et al [16] has reported the effect of growth time variation on length and diameter of ZnO nanorods. In his report, increasing the growth time can increase the length and diameter of nanorods.…”

Section: Resultsmentioning

confidence: 99%

Light backscattering (e.g. reflectance) by ZnO nanorods on tips of plastic optical fibres with application for humidity and alcohol vapour sensing

Lokman

Rahim

Harun

et al. 2016

Micro & Nano Letters

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Relative humidity and alcohol vapour sensing by light backscattering was demonstrated by zinc oxide (ZnO) nanorods grown on tips of plastic optical fibres. Synthesis of ZnO nanostructures was accomplished by the hydrothermal method. A new technique was proposed to extract the backscattered light by ZnO nanostructures. The system was shown experimentally to sense moisture and alcohol vapours. Three ranges of the visible spectrum blue (450-500 nm), green (500-570 nm) and red (610-700 nm) were studied in experiments. Spectral reflectance based on backscattering from ZnO surface structures was used to measure the amount of light backscattered by ZnO nanorods. Results showed that light in the red visible range of the spectrum had higher sensitivity and reflectivity compared with blue and green spectral ranges.

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“…A more practical approach would be to embed nanostructures that can provide gain, for example, ZnO, GaN, and GaAs. Implementing ZnO in fiber has successfully been demonstrated for other applications, mostly for sensing. − Several detection mechanisms have been put forth. For instance, Bora et al reported average coupling efficiency of ∼2.65% that changes the sensitivity when exposed to different chemical vapors .…”

Section: Conclusion and Way Forwardmentioning

confidence: 99%

Review of Open Cavity Random Lasers as Laser-Based Sensors

et al. 2022

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In this review, the concept of open cavity lasing for ultrasensitive sensing is explored, specifically in driving important innovations as laser-based biosensorsa field mostly dominated by fluorescence-based sensing. Laser-based sensing exhibits higher signal amplification and lower signal-to-noise ratio due to narrow emission lines as well as high sensitivity due to nonlinear components. The versatility of open cavity random lasers for probing analytes directly which is ultrasensitive to small changes in chemical composition and temperature fluctuations paves the path of utilizing narrow emission lines for advanced sensing. The concept of random lasing is first explained followed by a comparison of the different lasing threshold that has been reported. This is followed by a survey of reports on laser-based sensing and more specifically as biosensors. Finally, a perspective on the way forward for open cavity laser-based sensing is put forth.

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Controlled side coupling of light to cladding mode of ZnO nanorod coated optical fibers and its implications for chemical vapor sensing

Cited by 31 publications

References 21 publications

Effect of annealing process in tuning of defects in ZnO nanorods and their application in UV photodetectors

Effect of annealing process in tuning of defects in ZnO nanorods and their application in UV photodetectors

Light backscattering (e.g. reflectance) by ZnO nanorods on tips of plastic optical fibres with application for humidity and alcohol vapour sensing

Review of Open Cavity Random Lasers as Laser-Based Sensors

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