Dynamic etching method for fabricating a variety of tip shapes in the optical fibre probe of a scanning near‐field optical microscope

Muramatsu, Hiroshi; Homma, Katsunori; Chiba, Norio; Yamamoto, Naokatsu; Egawa, Akira

doi:10.1046/j.1365-2818.1999.00509.x

Cited by 39 publications

(27 citation statements)

References 8 publications

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“…At the non-sensing end, an FC standard optical fiber connector was fixed to facilitate the alignment of the sensor optical path during the repeated installation-and-uninstallation of the probes. At the sensing end, a double-tapered structure was fabricated using a simple static-and-dynamic etching method with 40% HF as the etchant (experimental details are provided as File S1); this method combined classical static tube etching [24] and dynamic liquid-level-lowering etching [25] and promoted the large-scale preparation of probes with good uniformity. The fabricated double-taper probe was bathed successively in NaOH (1 mol·L −1 ) and HCl (1 mol·L −1 ) for 10 min, and then dried for future use.…”

Section: Methodsmentioning

confidence: 99%

A Double-Taper Optical Fiber-Based Radiation Wave Other than Evanescent Wave in All-Fiber Immunofluorescence Biosensor for Quantitative Detection of Escherichia coli O157:H7

et al. 2014

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Cylindrical or taper-and-cylinder combination optical fiber probe based on evanescent wave has been widely used for immunofluorescence biosensor to detect various analytes. In this study, in contrast to the contradiction between penetration depth and analyte diameter of optical fiber probe-based evanescent wave, we demonstrate that double-taper optical fiber used in a radiation wave-based all-fiber immunofluorescence biosensor (RWAIB) can detect micron-scale analytes using Escherichia coli O157:H7 as representative target. Finite-difference time-domain method was used to compare the properties of evanescent wave and radiation wave (RW). Ray-tracing model was formulated to optimize the taper geometry of the probe. Based on a commercial multi-mode fiber, a double-taper probe was fabricated and connected with biosensor through a “ferrule connector” optical fiber connector. The RWAIB configuration was accomplished using commercial multi-mode fibers and fiber-based devices according to the “all-fiber” method. The standard sample tests revealed that the sensitivity of the proposed technique for E. coli O157:H7 detection was 103 cfu·mL−1. Quantitation could be achieved within the concentration range of 103 cfu·mL−1 to 107 cfu·mL−1. No non-specific recognition to ten kinds of food-borne pathogens was observed. The results demonstrated that based on the double-taper optical fiber RWAIB can be used for the quantitative detection of micron-scale targets, and RW sensing is an alternative for traditional evanescent wave sensing during the fabrication of fiber-optic biosensors.

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Section: Methodsmentioning

confidence: 99%

A Double-Taper Optical Fiber-Based Radiation Wave Other than Evanescent Wave in All-Fiber Immunofluorescence Biosensor for Quantitative Detection of Escherichia coli O157:H7

et al. 2014

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“…Thus, the initial meniscus height dependent on density of the etchant and the top layer defines the maximum taper length. The taper angle can be controlled by pulling the fiber up or down into HF [30]. Fig.…”

Section: Wet Chemical Etching Of Germanosilicate Fibersmentioning

confidence: 99%

Fabrication of corrugated Ge-doped silica fibers

Wróbel¹,

Stefaniuk²,

Antosiewicz³

et al. 2012

Opt. Express

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Abstract:We present a method of fabricating Ge-doped SiO2 fibers with corrugations around their full circumference for a desired length in the longitudinal direction. The procedure comprises three steps: hydrogenation of Ge-doped SiO2 fibers to increase photosensitivity, recording of Bragg gratings with ultraviolet light to achieve modulation of refractive index, and chemical etching. Finite-length, radially corrugated fibers may be used as couplers. Corrugated tapered fibers are used as high energy throughput probes in scanning near-field optical microscopy. Application to reflection filter fabrication," Appl. Phys. Lett. 32(10), 647 (1978). 14. R. Stöckle, Ch. Fokas, V. Deckert, R. Zenobi, B. Sick, B. Hecht, and U. P. Wild, "High-quality near-field optical probes by tube etching," Appl. Phys. Lett. 75(2), 160-162 (1999). 15. S. K. Mondal, A. Mitra, N. Singh, S. N. Sarkar, and P. Kapur, "Optical fiber nanoprobe preparation for near-field optical microscopy by chemical etching under surface tension and capillary action," Opt. Express 17(22), 19470-19475 (2009 ©2012 Optical Society of America

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“…Near-field optical fibre probes have been fabricated by etching in hydrofluoric acid [6] and by heating & pulling [7] using optic fibre splicer. Figure 6 shows the tips fabricated by chemical etching in (a) and heating & pulling in (b), respectively.…”

Section: Scanning Near-field Optical Microscopymentioning

confidence: 99%

<title>Versatile optical system for static and dynamic thermomagnetic recording using a scanning laser microscope</title>

et al. 2001

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Scanning Laser Microscopes (SLM) have been used to characterise the magnetic domain properties of various magnetic and magneto-optical materials. The SLM in our laboratory has been designed to enable both static and dynamic read-write operations to be performed on stationary media. In a conventional (static) SLM, data bits are recorded thermo-magnetically by focusing a pulse of laser light onto the sample surface. If the laser beam has a Gaussian intensity distribution (TEM 00 ) then so will the focused laser spot. The resultant temperature profile will largely mirror the intensity distribution of the focused spot, and in the region where the temperature is sufficiently high for switching to occur, in the presence of bias field, a circular data bit will be recorded. However, in a real magneto-optical drive the bits are written onto non-stationary media, and the resultant bit will be non-circular. A versatile optical system has been developed to facilitate both recording and imaging of data bits. To simulate the action of a Magneto-Optical drive, the laser is pulsed via an Acousto-Optic Modulator, whilst being scanned across the sample using a galvanometer mounted mirror, thus imitating a storage medium rotating above a MO head with high relative velocity between the beam and medium. Static recording is simply achieved by disabling the galvanometer scan mirror. Polar magneto-optic Kerr effect images are acquired using multiple-segment photo-detectors for diffraction-limited scanned spot detection, with either specimen scanning for highest resolution or beam scanning for near real-time image acquisition. Results will be presented to illustrate the systems capabilities.

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Dynamic etching method for fabricating a variety of tip shapes in the optical fibre probe of a scanning near‐field optical microscope

Cited by 39 publications

References 8 publications

A Double-Taper Optical Fiber-Based Radiation Wave Other than Evanescent Wave in All-Fiber Immunofluorescence Biosensor for Quantitative Detection of Escherichia coli O157:H7

A Double-Taper Optical Fiber-Based Radiation Wave Other than Evanescent Wave in All-Fiber Immunofluorescence Biosensor for Quantitative Detection of Escherichia coli O157:H7

Fabrication of corrugated Ge-doped silica fibers

<title>Versatile optical system for static and dynamic thermomagnetic recording using a scanning laser microscope</title>

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