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Statements

Subject Item
n2:RIV%2F67985882%3A_____%2F13%3A00396688%21RIV14-MSM-67985882
rdf:type
skos:Concept n15:Vysledek
dcterms:description
We present the numerical design of a turn-around-point long-period grating in a photonic crystal fiber (TAP PCF-LPG) for high-sensitivity, high-resolution refractometry of gases. High refractive-index sensitivity is achieved by operating LPGs in the vicinity of the dispersion turning point of the optimized PCF. Despite the resonant wavelength of the optimized PCF-LPG is highly sensitive to the refractive index of analytes, its large shifts could be monitored with a reduced resolution because the resonance dip in the TAP LPG transmission spectrum is broad. To provide also high refractive-index resolution, twin TAP-LPGs have been proposed to be used as 3 dB broadband mode converters in the interferometric scheme. The first LPG couples a portion of the light in the core mode to a forward propagating cladding mode and the second LPG couples the light back to the core mode. The resulting interference fringes within the envelope of LPG attenuation dip provide a means for higher resolution sensing. Instead of monitoring the wavelength shift as a result of a refractive index change, the transmission spectrum can also be analyzed in terms of the shift in phase suffered by the fringe pattern. This is a more accurate way of interpreting the interferometric sensor measurements, since the phase shift is a direct result of an analyte-induced change in optical path length We present the numerical design of a turn-around-point long-period grating in a photonic crystal fiber (TAP PCF-LPG) for high-sensitivity, high-resolution refractometry of gases. High refractive-index sensitivity is achieved by operating LPGs in the vicinity of the dispersion turning point of the optimized PCF. Despite the resonant wavelength of the optimized PCF-LPG is highly sensitive to the refractive index of analytes, its large shifts could be monitored with a reduced resolution because the resonance dip in the TAP LPG transmission spectrum is broad. To provide also high refractive-index resolution, twin TAP-LPGs have been proposed to be used as 3 dB broadband mode converters in the interferometric scheme. The first LPG couples a portion of the light in the core mode to a forward propagating cladding mode and the second LPG couples the light back to the core mode. The resulting interference fringes within the envelope of LPG attenuation dip provide a means for higher resolution sensing. Instead of monitoring the wavelength shift as a result of a refractive index change, the transmission spectrum can also be analyzed in terms of the shift in phase suffered by the fringe pattern. This is a more accurate way of interpreting the interferometric sensor measurements, since the phase shift is a direct result of an analyte-induced change in optical path length
dcterms:title
High-sensitivity high-resolution refractometry with twin turn-around-point long-period gratings in a photonic crystal fiber High-sensitivity high-resolution refractometry with twin turn-around-point long-period gratings in a photonic crystal fiber
skos:prefLabel
High-sensitivity high-resolution refractometry with twin turn-around-point long-period gratings in a photonic crystal fiber High-sensitivity high-resolution refractometry with twin turn-around-point long-period gratings in a photonic crystal fiber
skos:notation
RIV/67985882:_____/13:00396688!RIV14-MSM-67985882
n15:predkladatel
n20:ico%3A67985882
n4:aktivita
n9:P n9:I
n4:aktivity
I, P(LD11030)
n4:dodaniDat
n11:2014
n4:domaciTvurceVysledku
n6:6919324
n4:druhVysledku
n21:D
n4:duvernostUdaju
n14:S
n4:entitaPredkladatele
n13:predkladatel
n4:idSjednocenehoVysledku
77436
n4:idVysledku
RIV/67985882:_____/13:00396688
n4:jazykVysledku
n19:eng
n4:klicovaSlova
fibre design; Photonic crystal fibres; interferometric sensor
n4:klicoveSlovo
n12:Photonic%20crystal%20fibres n12:interferometric%20sensor n12:fibre%20design
n4:kontrolniKodProRIV
[5771D5726430]
n4:mistoKonaniAkce
Prague
n4:mistoVydani
BELLINGHAM
n4:nazevZdroje
MICRO-STRUCTURED AND SPECIALTY OPTICAL FIBRES II
n4:obor
n18:JA
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
1
n4:projekt
n17:LD11030
n4:rokUplatneniVysledku
n11:2013
n4:tvurceVysledku
Kaňka, Jiří
n4:typAkce
n5:WRD
n4:wos
000323548700020
n4:zahajeniAkce
2013-04-15+02:00
s:issn
0277-786X
s:numberOfPages
9
n22:doi
10.1117/12.2017335
n10:hasPublisher
SPIE-INT SOC OPTICAL ENGINEERING
n7:isbn
978-0-8194-9577-8