Polarization-dependent refractometer for discrimination of temperature and ambient refractive index

Kim, H.-J.; Kwon, Oh-Jang; Lee, S. B.; Han, Young‐Geun

doi:10.1364/ol.37.001802

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…This temperature-dependent resonance 256 peak shift is expected and it has been discussed in previously 257 published work [19], [20]. However since the resonant peak University of Southampton, Southampton, U.K..…”

supporting

confidence: 57%

Enhanced Refractometer Based on Periodically Tapered Small Core Singlemode Fiber

Wang¹,

Brambilla

Ding

et al. 2013

IEEE Sensors J.

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supporting

confidence: 57%

Enhanced Refractometer Based on Periodically Tapered Small Core Singlemode Fiber

Wang¹,

Brambilla

Ding

et al. 2013

IEEE Sensors J.

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“…This has been manifested by relating the RI change to a shift in the transmission spectrum of micro-ring resonators 12 , 13 , micro-fiber resonators 14 – 16 , Mach–Zehnder interferometers 17 , 18 , a shift in surface plasmon resonance 19 , 20 , or detecting the shift in the reflection spectrum of Fabry–Perot resonators 21 , 22 . Polarization is another property of light that has been used to diversify the RI measurements, thereby improving the sensing precision 23 , 24 . Although these later techniques can detect the index of refraction with high resolution (reaching ~10 −6 RIU), they often suffer from a lack of tunability and reconfigurability and have a narrow dynamic range, high cost, sensitive interfacing and packaging requirements, and complex device fabrication processes.…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of tunable refractometer based on orbital angular momentum of longitudinally structured light

2018

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The index of refraction plays a decisive role in the design and classification of optical materials and devices; therefore, its proper and accurate determination is essential. In most refractive index (RI) sensing schemes, however, there is a trade-off between providing high-resolution measurements and covering a wide range of RIs. We propose and experimentally demonstrate a novel mechanism for sensing the index of refraction of a medium by utilizing the orbital angular momentum (OAM) of structured light. Using a superposition of co-propagating monochromatic higher-order Bessel beams with equally spaced longitudinal wavenumbers, in a comb-like setting, we generate non-diffracting rotating light structures in which the orientation of the beam’s intensity profile is sensitive to the RI of the medium (here, a fluid). In principle, the sensitivity of this scheme can exceed ~2700°/RI unit (RIU) with a resolution of ~ RIU. Furthermore, we show how the unbounded degrees of freedom associated with OAM can be deployed to offer a wide dynamic range by generating structured light that evolves into different patterns based on the change in RI. The rotating light structures are generated by a programmable spatial light modulator. This provides dynamic control over the sensitivity, which can be tuned to perform coarse or fine measurements of the RI in real time. This, in turn, allows high sensitivity and resolution to be achieved simultaneously over a very wide dynamic range, which is a typical trade-off in all RI sensing schemes. We thus envision that this method will open new directions in refractometry and remote sensing.

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“…High sensitivities of long-period fiber gratings (LPGs) to external perturbations, such as temperature, strain, and bending, have led to much interest in a variety of fiberoptic sensors [1][2][3][4][5]. LPGs with a large scale periodic axial perturbation in a single-mode fiber (SMF) can couple a forward propagating core mode (HE 11 ) to the forward propagating cladding modes (HE 1m ) in a SMF, which results in resonant peaks in the transmission.…”

mentioning

confidence: 99%

Influence of the waist diameters on transmission characteristics and strain sensitivity of microtapered long-period fiber gratings

Yoon

Kim

et al. 2013

Opt. Lett.

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Transmission characteristics of microtapered long-period fiber gratings (MTLPGs) and their strain and temperature sensitivities with variations in the waist diameters are investigated theoretically and experimentally. Transmission characteristics of MTLPGs strongly depend on the waist diameter of the tapered optical fiber (TOF) because of the modification of the effective index difference between the core and the cladding modes. Based on the photoelastic effect, the resonant wavelengths of MTLPGs with variations in strain shift to shorter wavelengths. The strain sensitivity of the MTLPG with a waist diameter of 25 μm is improved by a factor of 20 compared with that of a 125 μm long-period fiber grating. The temperature sensitivities of MTLPGs are also enhanced by reducing the waist diameter of the TOF.

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Polarization-dependent refractometer for discrimination of temperature and ambient refractive index

Cited by 13 publications

References 11 publications

Enhanced Refractometer Based on Periodically Tapered Small Core Singlemode Fiber

Enhanced Refractometer Based on Periodically Tapered Small Core Singlemode Fiber

Experimental demonstration of tunable refractometer based on orbital angular momentum of longitudinally structured light

Influence of the waist diameters on transmission characteristics and strain sensitivity of microtapered long-period fiber gratings

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