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| 1 | Hollow-core antiresonant terahertz fiber-based TOPAS extruded from a 3D printer using a metal 3D printed nozzle显示文摘We report the use of a terahertz(THz)transparent material,cyclic olefin copolymer(COC or TOPAS),for fabricating a hollow-core antiresonant fiber that provides an electromagnetic wave guidance in the THz regime.A novel fabrication technique to realize a hollow-core antiresonant polymer optical fiber(HC-ARPF)for THz guidance is proposed and demonstrated.The fiber is directly extruded in a single-step procedure using a conventional fused deposition modeling 3 D printer.The fiber geometry is defined by a structured nozzle manufactured with a metal 3 D printer,which allows tailoring of the nozzle design to the various geometries of microstructured optical fibers.The possibility to use the HC-ARPF made from TOPAS for guiding in the THz region is theoretically and experimentally assessed through the profile of mode simulation and time-frequency diagram(spectrogram)analysis. | WANVISA TALATAISONG JON GORECKI LIEKE D.VAN PUTTEN RAND ISMAEEL JAMES WILLIAMSON KATIE ADDINALL DANIEL SCHWENDEMANN MARTYNAS BERESNA VASILIS APOSTOLOPOULOS GILBERTO BRAMBILLA | 2021 | Photonics Research2021，9，8： | 2 |
| 2 | Fiber Bragg gratings with enhanced thermal stability 显示文摘 | Gilberto Brambilla Harvey Rutt | 2002 | Applied Physics Letters2002，80，18： | 1 |
| 3 | Optical mierofiher coupler for broadband single-mode operation显示文摘 | Yongmin Jung Gilberto Brambilla David J Richardson | 2009 | Opt Express2009，17，7： | 1 |
| 4 | Fast-response high temperature microfiber coupler tip thermometer显示文摘 | Ming Ding Pengfei Wang Gilberto Brambilla | 2012 | IEEE Photon Technol Lett2012，24，14： | 1 |
| 5 | A mierofiber coupler tipther-mometer显示文摘 | Ming Ding Pengfei Wang Gilberto Brambilla | 2012 | Opt Express2012，20，5： | 1 |
| 6 | A micro- fiber coupler tip thermometer显示文摘 | DING Ming WANG Peng-fei Brambilla Gilberto | 2011 | Optics Express2011，20，5： | 1 |
| 7 | Optical microfiber coupler for broadband single-mode operation显示文摘 | Yongmin Jung Gilberto Brambilla David J Richardson | 2009 | Opt Express2009，17，7： | 1 |
| 8 | Fast-response high-temperature microfiber coupler tip thermometer显示文摘 | Ming Ding Pengfei Wang Gilberto Brambilla | 2012 | Photonics Technology Letters2012，24，14： | 1 |
| 9 | A microfiber coupler tip ther-mometer显示文摘 | Ming Ding Pengfei Wang Gilberto Brambilla | 2012 | Opt Express2012，20，5： | 1 |
| 10 | Fast-response high-temperature microfiber coupler tip thermometer 显示文摘 | DING Ming WANG Peng-fei Brambilla Gilberto | 2012 | IEEE Photonics Technology Letters2012，24，14： | 1 |
| 11 | Compact nano-void spectrometer based on a stable engineered scattering system显示文摘Random scattering of light in disordered media can be used for highly sensitive speckle-based wavemeters and spectrometers. However, the multiple scattering events that fold long optical paths within a compact space also make such devices exceedingly sensitive to vibrations and small disturbances to the disordered media. Here, we show how scattering can be engineered so that it can be used for a compact computational spectrometer that is largely insensitive to environmental factors. We designed and fabricated a three-dimensional pseudo-random nano-void pattern with 62% scattering efficiency. The controlled amount of multiple scattering ensured a sufficiently long optical path for the target resolution of 100 pm, with optimal long-term stability. The 200-μm-thick scattering silica substrate was integrated in a compact assembly with a low-cost camera sensor. The target resolution was achieved for full spectrum measurements while single wavelengths could be determined with 50 pm resolution. Such tailored scattering systems can improve the trade-off among cost, size, stability, and spectral resolution in computational spectrometers. | QI SUN PRZEMYSLAW FALAK TOM VETTENBURG TIMOTHY LEE DAVID BPHILLIPS GILBERTO BRAMBILLA MARTYNAS BERESNA | 2022 | Photonics Research2022，10，10： | 0 |
| 12 | Strain Sensor Based on Embedded Fiber Bragg Grating in Thermoplastic Polyurethane Using the 3D Printing Technology for Improved Sensitivity显示文摘A new and easy-to-fabricate strain sensor has been developed,based on fiber Bragg grating(FBG)technology embedded into a thermoplastic polyurethane filament using a 3-dimensional(3D)printer.Taking advantage of the flexibility and elastic properties of the thermoplastic polyurethane material,the embedding of the FBG provides durable protection with enhanced flexibility and sensitivity,as compared to the use of a bare FBG.Results of an evaluation of its performance have shown that the FBG sensors embedded in this way can be applied effectively in the measurement of strain,with an average wavelength responsivity of 0.0135 nm/cm of displacement for tensile strain and -0.0142 nm/cm for compressive strain,both showing a linearity value of up to 99%.Furthermore,such an embedded FBG-based strain sensor has a sensitivity of~1.74 times greater than that of a bare FBG used for strain measurement and is well protected and suitable for in-the-field use.It is also observed that the thermoplastic polyurethane based(TPU-based)FBG strain sensor carries a sensitivity value of~2.05 times higher than that of the polylactic acid based(PLA-based)FBG strain sensor proving that TPU material can be made as the material of choice as a“sensing”pad for the FBG. | Harith AHMAD Mohamad Ashraff ALIAS Mohammad Faizal ISMAIL Nor Najwa ISMAIL Muhammad Khairol Annuar ZAINI Kok Sing LIM Gilberto BRAMBILLA Kenneth T.V.GRATTAN B.MAzizur RAHMAN | 2022 | Photonic Sensors2022，12，3： | 0 |
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