Refractive index sensitivity of fibre optic long period gratings with SiO 2 nanoparticle based mesoporous coatings

Korposh, Sergiy; Lee, SeungWoo; James, Stephen W.; Tatam, Ralph P.

doi:10.1117/12.884777

Cited by 6 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No response of the sensor to CO2 could also be explained by the high film thickness, estimated to be ≈ 2 µm (Figure S1c), which greatly exceeded the optimum region for the sensitive coating in a range of hundreds of nm (52).…”

Section: Co2 Sensing Using In-situ Crystallization Techniquementioning

confidence: 99%

Carbon dioxide measurements using long period grating optical fibre sensor coated with metal organic framework HKUST-1

Hromádka

Tokay

Correia

et al. 2018

Sensors and Actuators B: Chemical

Self Cite

View full text Add to dashboard Cite

An optical fibre long period grating (LPG) based carbon dioxide (CO2) sensor coated with HKUST-1, a material from the metal organic framework family, functional coating is presented. In-situ crystallization and layer by layer (LbL) techniques of HKUST-1 thin film synthesis are compared in terms of the feasibility of the deposition procedure (time and cost efficiency) and the sensitivity of the film to carbon dioxide. The sensing mechanism is based on the measurement of the change of the refractive index (RI) of the coating that is induced by the penetration of CO2 molecules into the HKUST-1 pores. The HKUST-1 film was characterized by scanning electron microscopy (SEM). The thickness and refractive index (RI) of the 10, 20 and 40 layers thick films were determined using ellipsoetry. The crystallinity of the films was examined by X-ray diffraction pattern (XRD). While no response to CO2 was observed for the sensor coated using the in-situ crystallization technique, an LPG modified with 10, 20 and 40 layers of HKUST-1 films using LbL method upon exposure to CO2 in the range of 500 ppm to 40,000 ppm showed good sensitivity. The film containing 40 layers exhibited the highest sensitivity to CO2 with an obtained detection limit of 401 ppm.

show abstract

Section: Co2 Sensing Using In-situ Crystallization Techniquementioning

confidence: 99%

Carbon dioxide measurements using long period grating optical fibre sensor coated with metal organic framework HKUST-1

Hromádka

Tokay

Correia

et al. 2018

Sensors and Actuators B: Chemical

Self Cite

View full text Add to dashboard Cite

show abstract

“…The selection of the material determines the analytes to which the coated LPG is sensitive and the thickness influences the sensitivity [ 24 ]. The response of the transmission spectrum of the LPG to the nanoscale coating deposition is characterized by a shift of the central wavelengths of the attenuation bands, which are caused by the change of the effective index of the cladding modes, and this change is optical-thickness dependent [ 25 ]. In addition, the highest sensitivity and the best performance are obtained when the LPG operates at or near the phase matching turning point (PMTP) [ 26 ], requiring an appropriate combination of grating period and optical thickness of the coating.…”

Section: Introductionmentioning

confidence: 99%

Volatile Organic Compounds Sensing Using Optical Fibre Long Period Grating with Mesoporous Nano-Scale Coating

Hromádka

Korposh

Partridge

et al. 2017

Sensors

Self Cite

View full text Add to dashboard Cite

A long period grating (LPG) modified with a mesoporous film infused with a calixarene as a functional compound was employed for the detection of individual volatile organic compounds (VOCs) and their mixtures. The mesoporous film consisted of an inorganic part, SiO2 nanoparticles (NPs), along with an organic moiety of poly(allylamine hydrochloride) polycation PAH, which was finally infused with the functional compound, p-sulphanato calix[4]arene (CA[4]) or p-sulphanato calix[8]arene (CA[8]). The LPG sensor was designed to operate at the phase matching turning point to provide the highest sensitivity. The sensing mechanism is based on the measurement of the refractive index (RI) change induced by a complex of the VOCs with calixarene. The LPG, modified with a coating of 5 cycles of (SiO2 NPs/PAH) and infused with CA[4] or CA[8], was exposed to chloroform, benzene, toluene and acetone vapours. The British Standards test of the VOCs emissions from material (BS EN ISO 16000-9:2006) was used to test the LPG sensor performance.

show abstract

“…This sensor works on the principle of changes in the attenuation bands with variation in the external environment parameters such as temperature, strain, and ambient refractive index. Recently, there are also several papers on improving the RI sensitivity: the chemical etch on the LPG cladding, tilted LPG, fabrication of complex structure and the deposition coating on LPG [8][9][10][11][12][13]. Another group of LPG sensors are formed with corrugations fabricated on its cladding.…”

Section: Introductionmentioning

confidence: 99%

Improved Refractive Index Sensitivity Utilizing Long-Period Gratings with Periodic Corrugations on Cladding

Lim

Tjin

2012

Journal of Sensors

View full text Add to dashboard Cite

A new structure of Long-Period Gratings (LPGs) sensor is introduced as a sensitive ambient RI sensor. This structure consists of creating periodic corrugations on the cladding of the LPG. The experimental results show that this LPG structure has good performances in terms of linearity and sensitivity and serves as a highly sensitive and cost-effective sensor. It also has the advantage of portability as the corrugation can also serve as the reservoir for the specimen collection to be tested.

show abstract

Refractive index sensitivity of fibre optic long period gratings with SiO 2 nanoparticle based mesoporous coatings

Cited by 6 publications

References 14 publications

Carbon dioxide measurements using long period grating optical fibre sensor coated with metal organic framework HKUST-1

Carbon dioxide measurements using long period grating optical fibre sensor coated with metal organic framework HKUST-1

Volatile Organic Compounds Sensing Using Optical Fibre Long Period Grating with Mesoporous Nano-Scale Coating

Improved Refractive Index Sensitivity Utilizing Long-Period Gratings with Periodic Corrugations on Cladding

Contact Info

Product

Resources

About