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Tailoring Properties of Microcavity In-line Mach-Zehnder Interferometer by the Microcavity Enlargement using Femtosecond Laser
摘要： This work presents a theoretical analysis and experimental verification of fine-tuning of the spectral response and refractive index (RI) sensitivity of microcavity in-line Mach-Zehnder interferometer (μIMZI). The μIMZIs were fabricated using femtosecond (fs) laser micromachining in standard single-mode fibers as circular cavities with a diameter of 60 μm. Next, the structures underwent fs laser post-processing, which included fabrication of an additional cavity with the same diameter but shifted by 15 μm or 30 μm against the center of the initial microcavity. Different depths of the additional structures were investigated. The enlargement of the microcavity allows for tailoring the spectral response, i.e., it shifts the interference pattern by more than 200 nm, with no introduction of any additional losses and distortions in the spectrum. As the additional effect, regardless of the size of the extension, the sensitivity of the enlarged μIMZI was improved by 32%.
关键词： Fiber optics sensors,Laser materials processing,Interferometry,Microcavities,Microstructure fabrication
更新于2025-11-28 14:23:57
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[IEEE 2019 20th International Conference on Electronic Packaging Technology(ICEPT) - Hong Kong, China (2019.8.12-2019.8.15)] 2019 20th International Conference on Electronic Packaging Technology(ICEPT) - Micro-dimple/pillar array molded by a track-etching mold for improving the optical performance of quantum dot film
摘要： Recently, phosphor films have been widely used in display, illumination and other fields. Methods of fabricating structures on phosphor films to enhance their optical properties have attracted great attention in academia and industry. Current methods to fabricate a structured film are mainly by imprinting techniques. However, crystalline silicon or a patterned sapphire substrate are applied to the transfer substrate, which is cumbersome and expensive. This paper describes a track-etching mold, prepared by bombarding a polycarbonate film (PC) with high-speed particles to form phosphor film with microporous structure，which also has a transfer effect. The process is simple and efficient. Simultaneously, the micro-pillar structure PDMS film (MPS-PDMS film) transferred by the PC film has a discrete distribution of micro-pillar structures. Their optical performance was measured and the haze was improved by 12.06% compared with the unstructured PDMS film (US- PDMS film). Subsequently, the micro-dimples structure quantum dots film (MDS-QDs film) was secondarily fabricated using the MPS-PDMS film to have a dimple structure. The red optical power of MDS-QDs film was improved by 7.7% as compared with the unstructured quantum dot film (US-QDs film). Therefore, the structural QD films shows great potential value in luminance and display.
关键词： Track-etching mold,Quantum dots film,Microstructure fabrication,Optical power
更新于2025-09-23 15:21:01
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Helicity Enhanced Torsion Sensor Based on Liquid Filled Twisted Photonic Crystal Fibers
摘要： A highly sensitive torsion sensor can be constructed by combining a twisted photonic crystal fiber with a liquid-filled waveguide in its air-hole cladding. The torsion sensitivity of this type of sensor is determined directly by the phase-matching conditions between the fiber core mode and the liquid waveguide mode, which can be improved by tuning the helicity (denoted by the initial twist rate, α0) of the twisted photonic crystal fiber. The enhancement mechanism of α0 on the sensitivity of the proposed torsion sensor is investigated theoretically, followed by experimental verifications, and a torsion sensitivity as high as 446 nm·mm·rad?1 can be obtained by tailoring these parameters. Experimental results show that the torsion sensitivity increases with α0 decreasing from 3.142 to 3.925 rad/mm, which are in consistence with that of the numerical predictions. The demonstrated torsion sensor is expected to contribute to the development of highly sensitive torsion-related photonic crystal fiber devices.
关键词： photonic crystal fibers,microstructure fabrication,fiber optics sensors
更新于2025-09-23 15:19:57
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Fabrication of low loss channel waveguide in tungsten-tellurite glass by 11?MeV carbon ion microbeam for telecom C band
摘要： Channel waveguides were directly written in Er: TeO2W2O3 glass using 11 MeV C4+ ion microbeam with fluences in the range of 1·1014–5·1016 ion/cm2. The channel waveguides supported a single guided mode at λ = 1540 nm. Propagation losses of the as-irradiated channel waveguides were around 14 dB/cm. A 30-min thermal annealing at 150 °C in air reduced propagation losses at λ = 1400 nm to 1.5 dB/cm. This method produced channel waveguides with confinement and propagation losses comparable to or better than other current methods, such as MeV energy focused proton or helium ion beam writing.
关键词： Microstructure fabrication,Channel waveguides,Rare earth doped materials,Integrated optics,Optical design and fabrication
更新于2025-09-19 17:13:59
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Roll-to-Roll Embossing of Optical Radial Fresnel Lenses on Polymer Film for Concentrator Photovoltaics: A Feasibility Study
摘要： Fresnel-based concentrated photovoltaic (CPV) solar power systems have been proven effective to significantly enhance the photoelectric conversion efficiency, but a standard-size solar plant will require an extremely large amount of polymer radial Fresnel lenses. Roll-to-roll (R2R) manufacturing is a high-throughput technology to mass produce high-quality functional optical polymer film. In this paper, we have firstly studied a complete manufacturing cycle for R2R embossing of radial Fresnel lens polymer film for CPV systems, in terms of polymer lens design, roller mold machining, R2R embossing and optical performance test. Instead of wrapping an electroplated metal sheet onto the roller in conventional R2R process, the lens pattern array is directly machined using a 5-axis ultra-precision machining system to guarantee its surface quality and accuracy. Optical performance evaluation for the manufactured polymer film using a reference solar cell is conducted, and results have shown that radial Fresnel lens on the polymer film can achieve a sunlight concentration ratio 3.9 × times that of linear lenses with a much smaller receiving area. This study has explored the feasibility for R2R embossing of optical polymer film, an industry-applicable and cost-effective technology for mass production of high-quality Fresnel lenses to be used in high-efficiency CPV systems.
关键词： Microstructure fabrication,Solar power,Optical Fresnel lens,Concentrator photovoltaics
更新于2025-09-11 14:15:04