Single-mode-fiber to thin film optical waveguide couplers using bulk laser crystals

1998 ◽  
Author(s):  
Valery A. Kozlov ◽  
Valerii V. Ter-Mikirtychev ◽  
Taiju Tsuboi
Keyword(s):  
Thin Film ◽  
Optical Waveguide ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Laser Crystals

scholarly journals Optical Waveguide BTX Gas Sensor Based on Yttrium-Doped Lithium Iron Phosphate Thin Film

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Patima Nizamidin ◽  
Abliz Yimit ◽  
Ismayil Nurulla ◽  
Kiminori Itoh
Keyword(s):  
Thin Film ◽  
Optical Waveguide ◽  
Lithium Iron Phosphate ◽  
Single Mode ◽  
Iron Phosphate ◽  
Guided Wave ◽  
Sensing Material ◽  
Other Substances ◽  
One Step ◽  
Higher Sensitivity

Yttrium-doped LiFePO4 powder was synthesized using the hydrothermal method in one step and was used as a sensing material. An optical waveguide (OWG) sensor based on Yttrium-doped LiFePO4 has been developed by spin coating a thin film of LiFe0.99Y0.01PO4 onto a single-mode Tin-diffused glass optical waveguide. Light was coupled into and out of glass OWG employed by a pair of prisms. The guided wave transmits in waveguide layer and passes through the film as an evanescent wave. The sensing film is stable in air, but when exposed to target gas at room temperature, its optical properties such as transmittance (T) and refractive index (nf) were changed; thus, the transmitted light intensity was changed. The LiFe0.99Y0.01PO4 thin film OWG exhibits reversible response to xylene gas in the range of 0.1–1000 ppm. When the concentration of BTX gases was lower than 1ppm, other substances caused a little interference with the detection of xylene vapor. Compared to pure LiFePO4 thin film OWG, this sensor exhibited higher sensitivity to BTXs.

Design and Fabrication of a SOI Optical Waveguide Sensing Platform for Biochemical Sensor Application

2015 ◽  
Vol 645-646 ◽  
pp. 777-782
Author(s):  
Yu Jin Liu ◽  
Ying Dong ◽  
Deng Peng Yuan ◽  
Tian Jian Li
Keyword(s):  
Optical Waveguide ◽  
Inductively Coupled Plasma ◽  
Fdtd Method ◽  
Strong Support ◽  
Single Mode ◽  
Transmission Condition ◽  
Single Mode Fiber ◽  
Biochemical Sensor ◽  
Icp Etching ◽  
Sensing Platform

A micro biochemical sensor based on a SOI optical waveguide sensing platform is reported in this article. The sensing platform utilizes a Mach-Zehnder Interferometer (MZI) configuration. In order to satisfy the single-mode transmission condition of the waveguide and match the coupling size of standard single-mode fiber, a ridge waveguide structure is adopted to construct the MZI configuration. The key parameters of the waveguide are optimized by FDTD method. A process composed of contact exposure photolithography and Inductively Coupled Plasma (ICP) etching technology has been worked out for the fabrication of the optical waveguide sensing platform on SOI wafer. In the process, only one photolithographic mask is used. The mask is designed to have several patterns including an array of MZI configurations for multiple species sensing, a group of ridge waveguides with different key parameters as test references, and a group of geometric compensation schemes to test the methods of modifying the deviation which may arise during the ICP etching step. Process simulations are conducted to predict the exposure and etching results, which give strong support to the fabrication process control. Lithography problems including photoresist desquamation and line narrowing are solved to achieve the special structure.

scholarly journals An Optical Fiber Fabry–Perot Pressure Sensor with Optimized Thin Microbubble Film Shaping for Sensitivity Enhancement

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 358 ◽  
Author(s):  
Shubin Zhang ◽  
Zhenjun Shao ◽  
Jinrong Liu ◽  
Meixue Zong ◽  
Jian Shen ◽  
...  
Keyword(s):  
Thin Film ◽  
Arc Discharge ◽  
Structural Parameters ◽  
Silicon Film ◽  
Glass Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fabry Perot ◽  
Micrometer Scale

A pressure-assisted arc discharge method of preparing silicon microbubbles with a glass tube was utilized for decreasing the bubble film’s thickness and improving the bubble’s uniformity. By controlling the arc discharge intensity, discharge time and the position of the fiber carefully, the thickness of the microbubble film was reduced to the micrometer scale. Later, the thin film of the microbubble was transferred to the end the single-mode-fiber/glass-tube structure, for forming the FP (Fabry–Perot) interference cavity. As the thin film is sensitive to the outer pressure, such a configuration could be used for a high-sensitive-pressure measurement. Experimental results show that the sensitivity of this FP (Fabry–Perot) cavity was 6790 pm/MPa when the outer pressure ranges from 100 to 1600 kPa, and the relationship between the structural parameters of the thin film and the outer pressure was theoretically analyzed. Moreover, this special structure made of the end silicon film microbubble is more suitable for high-sensitivity applications.

scholarly journals A High-Sensitive Pressure Sensor Using a Single-Mode Fiber Embedded Microbubble with Thin Film Characteristics

Sensors ◽  
2017 ◽  
Vol 17 (6) ◽  
pp. 1192 ◽  
Author(s):  
Guanjun Wang ◽  
Xinglin Liu ◽  
Zhiguo Gui ◽  
Yongquan An ◽  
Jinyu Gu ◽  
...  
Keyword(s):  
Thin Film ◽  
Pressure Sensor ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Film Characteristics ◽  
Sensitive Pressure

A refractometric sensor using index-sensitive mode resonance between single-mode fiber and thin film amorphous silicon waveguide

2005 ◽  
Vol 106 (1) ◽  
pp. 484-488 ◽  
Author(s):  
Andrey Andreev ◽  
Blagoy Pantchev ◽  
Parvaneh Danesh ◽  
Blagovesta Zafirova ◽  
Elka Karakoleva ◽  
...  
Keyword(s):  
Thin Film ◽  
Amorphous Silicon ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Silicon Waveguide
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