3D refractive index measurements of special optical fibers

Yan, Cheng; Huang, Sujuan; Zhang, Miao; Chang, Zheng; Zeng, Junzhang; Wang, Ting-Yun

doi:10.1016/j.yofte.2016.05.007

Cited by 34 publications

(13 citation statements)

References 14 publications

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“…Many optical techniques are investigated to extract the phase distribution, such as optical coherence tomography (OCT) [6][7][8], phase-shifting interferometry [9][10][11][12], digital holography (DH) [13][14][15][16][17][18] and so on. Most of them are based on interferometry and have the ability to obtain phase information with high sensitivity and without contact and stain.…”

Section: Introductionmentioning

confidence: 99%

“…The Fresnel algorithm is usually used to reconstruct object image, while the AS algorithm, an analytical solution of wave equation, has higher precision for phase extraction and thus are widely-used algorithm in biological analysis. The AS algorithm needs spectral selection firstly [15][16][17][18]. Thus, the accurate and complete selection of spectrum has a direct bearing on extracting high-precision phase distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the accurate and complete selection of spectrum has a direct bearing on extracting high-precision phase distribution. The object spectrum is usually selected by band-pass filtering [17,18,32,33]. However, for biological tissues, which have complex structure, the wide spectrum of the tissues will cause serious spectrum aliasing with zero-order diffraction spectrum, which reduces the precision of AS algorithm and make the biological phase analysis not accurate enough.…”

Section: Introductionmentioning

confidence: 99%

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Phase distribution analysis of tissues based on the off-axis digital holographic hybrid reconstruction algorithm

Lin

Dong

Chen

et al. 2017

Biomed. Opt. Express

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Off-axis digital holography (DH) has great potential in histopathology for its high efficiency and precision. Phase distribution, usually extracted by the angular spectrum (AS) algorithm from a digital hologram, reflects important structural information of biological tissues. However, the complex structure of tissues introduces spectrum aliasing of the hologram, making the AS algorithm hard to realize and accurate phase analysis difficult to conduct. Here, we present a hybrid reconstruction algorithm, combining Fresnel reconstruction in spatial domain with the AS algorithm in frequency domain, to solve aliasing by spatial filtering. Through simulation, we demonstrate the feasibility and superiority of the hybrid algorithm and verified the precision (10 rad) of the hybrid algorithm with spectrum aliasing. We extract phase distributions from normal urothelial and bladder cancer tissues by the hybrid algorithm and make quantitative analysis through histogram and standard deviation. The result shows the hybrid algorithm in off-axis DH has great advantage for the high-precision phase extraction of tissues and supplies significant information for cancer diagnosis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase distribution analysis of tissues based on the off-axis digital holographic hybrid reconstruction algorithm

Lin

Dong

Chen

et al. 2017

Biomed. Opt. Express

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“…With an increase in the magnetic field, the magnetization (magnetic moment) of the EYDF fiber increased, the magnetic susceptibility decreased, and the magnetic response characteristics of the magnetic field below 500 Gs became more significant. The measurement system of the optical fiber RIC in our work was constructed based on the digital hologram technique [30], [31], as shown in Fig. 8.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Magneto-Refractive Effect and Mechanism Analysis of Erbium-Ytterbium Co-Doped Silica Fiber

et al. 2021

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The magneto-refractive properties of Er/Yb co-doped silica fiber (EYDF) are important in magnetic field sensing. Here, we proposed a theoretical calculation model of the EYDF using density functional theory (DFT) and demonstrated it by an interferometric digital hologram magneto-refractive measurement system. The calculation results show that the fiber material, doped with Er/Yb atoms, has a large net spin and asymmetric spin distribution, which enables the elements to play an important role in the magnetic characteristics of the material. The experimental results show that the refractive index of the fiber decreases linearly with the increase of the magnetic field. The sensitivity of EYDF is 3.8279 × 10 -5 RIU/Gs and is two orders of magnitude higher than that of single-mode fiber which is confirmed by the theoretical calculation. It demonstrated that the EYDF has advantages and potential of high sensitivity, miniaturization, and easy integration for magnetic field detection in harsh environments.

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“…The RI distribution of the laser-inscribed waveguide is first studied by a 3D reconstruction system for optical fiber refractive index distribution [12]. The cross-sectional RI distribution of the laser-inscribed waveguide is clearly presented in Fig.…”

mentioning

confidence: 99%

Surface plasmon resonance refractive index sensor based on fiber-interface waveguide inscribed by femtosecond laser

Zhang¹,

Liao²,

Lin³

et al. 2019

Opt. Lett.

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A novel surface plasmon resonance (SPR) configuration based on fiber-interface waveguide was proposed and realized by combining the technology of femtosecond laser writing waveguide with SPR effect for measuring refractive index (RI) of analyte. A U-shaped waveguide is inscribed in the coreless fiber and its bottom is very close to the fiber surface, which can produce strong evanescent field being sensitive to ambient media. When the fiber surface is coated with a layer of gold film, the strong evanescent field can excite the SPR effect on the fiber surface. Most importantly, different from some types of fiber SPR sensors with a fragile physical structure, the fiber-interface waveguide SPR sensor exhibits an excellent mechanical strength. Such a SPR sensor exhibits a high sensitivity of ∼3352 nm∕RIU at the RI value of ∼1.395, which may have important practical applications in medicine, environmental monitoring, and food safety.

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3D refractive index measurements of special optical fibers

Cited by 34 publications

References 14 publications

Phase distribution analysis of tissues based on the off-axis digital holographic hybrid reconstruction algorithm

Phase distribution analysis of tissues based on the off-axis digital holographic hybrid reconstruction algorithm

Magneto-Refractive Effect and Mechanism Analysis of Erbium-Ytterbium Co-Doped Silica Fiber

Surface plasmon resonance refractive index sensor based on fiber-interface waveguide inscribed by femtosecond laser

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