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Micro-Structured Fiber Interferometer as Sensitive Temperature Sensor

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Photonic Sensors 2013年第3期3卷 208-213页

作者： F. C. FAVERO M. BECKER, R. SPITTEL M. ROTHHARDT J. KOBELKE H. BARTELT Institute of Photonic Technology (ipht) Albert-Einstein-Strafle-9 07745 Jena Germany

We report on a fast and sensitive temperature sensor using a micro-structured or photonic crystal fiber interferometer with a high germanium doped fiber core. The wavelength sensitivity for temperature variation was as high as △λ/△T= 78 pm/℃ up to 500℃, which was 6 times more sensitive than the fiber Bragg grating temperature sensitivity of △λ/△TT= 13pm/℃ at 1550nm. The sensor device was investigated conceming the sensitivity characteristics and response time.

关键词： Micro-structured optical fiber fiber interferometer fiber temperature sensor

Direct molecular-level near-field plasmon and temperature assessment in a single plasmonic hotspot

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Light(Science & Applications) 2020年第1期9卷 1673-1685页

作者： Marie Richard-Lacroix Volker Deckert Leibniz Institute of Photonic Technology(ipht) Albert-Einstein-Strasse 9D-07745 JenaGermany Institute of Physical Chemistry and Abbe Center of Photonics University of JenaHelmholtzweg 4D-07743 JenaGermany

Tip-enhanced Raman spectroscopy(TERS)is currently widely recognized as an essential but still emergent technique for exploring the ***,our lack of comprehension of crucial parameters still limits its potential as a user-friendly analytical *** tip’s surface plasmon resonance,heating due to near-field temperature rise,and spatial resolution are undoubtedly three challenging experimental parameters to ***,they are also the most fundamentally relevant parameters to explore,because they ultimately influence the state of the investigated molecule and consequently the probed *** we propose a straightforward and purely experimental method to access quantitative information of the plasmon resonance and near-field temperature experienced exclusively by the molecules directly contributing to the TERS *** detailed near-field optical response,both at the molecular level and as a function of time,is evaluated using standard TERS experimental equipment by simultaneously probing the Stokes and anti-Stokes spectral ***-assembled 16-mercaptohexadodecanoic acid monolayers covalently bond to an ultra-flat gold surface were used as a *** of blinking lines in the spectra also provides crucial information on the lateral resolution and indication of atomic-scale thermally induced morphological changes of the tip during the *** study provides access to unprecedented molecular-level information on physical parameters that crucially affect experiments under TERS *** study thereby improves the usability of TERS in day-to-day *** obtained information is of central importance for any experimental plasmonic investigation and for the application of TERS in the field of nanoscale thermometry.

关键词： straight purely thereby

Effect of excess Y_2O_3 addition on the physical properties of melt processed YBCO bulks

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Science China(Physics,Mechanics & Astronomy) 2004年第1期47卷 17-23页

作者： YANG Wanmin1,2,3, ZHOU Lian2, FENG Yong2, ZHANG Pingxiang2, WU Minzhi3 & W. GAWALEK3 1. Department of Physics, Shaanxi Normal University, Xi抋n 710062, China 2. Northwest Institute for Nonferrous Metal Research. Xi抋n 710016, China 3. Institute fur Physikalische Hochtechnologie e.V(ipht), Jena, Germany Correspondence should be addressed to Yang Wanmin (email: wm-yang@***) Received June 27, 2003 1. Department of Physics Shaanxi Normal University 710062 Xi’an China 2. Northwest Institute for Nonferrous Metal Research 710016 Xi’an China 3. Institute fur Physikalische Hochtechnologie e.V (ipht) Jena Germany

The YBCO superconductors with Y2O3 addition were prepared by a modified melt textured process and the effects of excess Y2O3 addition on the physical properties of melt textured YBCO have been investigated. It is found that the melt temperature of YBCO samples decreases drastically with the increasing Y2O3, and the maximum levitation forces are drastically different for samples with different Y2O3 addition. It is also found that the optimal Y2O3 addition to YBCO is about 10wt%. Considering the microstructure and the starting composition, the results are well discussed and interpreted.

关键词： YBCO superconductor, melt growth, Y2O3 addition, levitation force.

Perovskites for Laser and Detector Applications

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Energy & Environmental Materials 2019年第2期2卷 146-153页

作者： Saunak Das Somayeh Gholipour Michael Saliba Institute of Physical Chemistry(IPC) Friedrich Schiller University JenaHelmholtzweg 4Jena 07743Germany Leibniz Institute of Photonic Technology(ipht) Albert-Einstein-Str.907745Jena Germany Adolphe Merkle Institute University of Fribourg CH 1700Switzerland Institute of Materials Science Technical University of DarmstadtD-64287Germany

Perovskite materials have triggered a renewed interest in photovoltaic research in the recent *** display crystal forms with 0D,1D and 2D,3D motifs,and several chemical forms,namely inorganic(titanates,rubidiates,nobiates,tantalates etc.),organic/inorganic metal halides with single to multiple cations,and even organic polymer or quantum dot-infused *** crystal type and chemical form are endowed with specific physicochemical,optical,electronic,and morphological *** unique properties render them suitable for targeted applications,namely photovoltaics,LEDs,photocatalysis/electrolysis/solar fuels/solar and Li-ion batteries,gas-sensors,ferroelectrics,capacitors,transistors and memristors,photodetectors,and lasers,for advanced quantum cryptography and outer space *** first,the crystal and material types,and physicochemical,morphological,and optoelectronic properties of perovskite materials are ***,we focus on those properties which cumulatively contribute to their application in the abovementioned ***,a comprehensive discussion about the advances in each field is ***/property/application relationships with key advances demonstrate the versatility of perovskites in modern optoelectronic technologies.

关键词： 2D perovskites hybrid perovskites micro-lasers X-ray detectors c-ray detectors

Nanoscopic Tip Sensors Fabricated by Gas Phase Etching of Optical Glass Fibers

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Photonic Sensors 2012年第4期2卷 331-339页

作者： Jorg BIERLICH Jens KOBELKE David BRAND Konstantin KIRSCH Jan DELLITH Hartmut BARTELT ipht Institute of Photonic Technology Albert-Einstein-Sir. 9 07745 Jena Germany EAH University of Applied Sciences Carl-Zeiss-Promenade 2 07745 Jena Germany

Silica-based fiber tips are used in a variety of spectroscopic, micro- or nano-scopic optical sensor applications and photonic micro-devices. The miniaturization of optical sensor systems and the technical implementation using optical fibers can provide new sensor designs with improved properties and functionality for new applications. The selective-etching of specifically doped silica fibers is a promising method in order to form complex photonic micro structures at the end or within fibers such as tips and cavities in various shapes useful for the all-fiber sensor and imaging applications. In the present study, we investigated the preparation of geometrically predefined, nanoscaled fiber tips by taking advantage of the dopant concentration profiles of highly doped step-index fibers. For this purpose, a gas phase etching process using hydrofluoric acid （HF） vapor was applied. The shaping of the fiber tips was based on very different etching rates as a result of the doping characteristics of specific optical fibers. Technological studies on the influence of the etching gas atmosphere on the temporal tip shaping and the final geometry were performed using undoped and doped silica fibers. The influence of the doping characteristics was investigated in phosphorus-, germanium-, fluorine- and boron-doped glass fibers. Narrow exposed as well as protected internal fiber tips in various shapes and tip radiuses down to less than 15 nm were achieved and characterized geometrically and topologically. For investigations into surface plasmon resonance effects, the fiber tips were coated with nanometer-sized silver layers by means of vapour deposition and finally subjected to an annealing treatment.

关键词： Optical fiber tips nanoprobes gas phase etching doping tip shaping metal coating

Fiber Fabry-Perot Interferometer for Curvature Sensing

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Photonic Sensors 2016年第4期6卷 339-344页

作者： Catarina S. MONTEIRO1 Marta S. FERREIRA Susana O. SILVA Jens KOBELKE Kay SCHUSTER JOrg BIERLICH Orlando FRAZAO Department of Physics and Astronomy Sciences Faculty Porto University Rua do Campo Alegre 687 4169-007 Porto Portugal INESC-TEC Rua do Campo Alegre 687 4169-007 Porto Portugal ipht Jena - Leibniz Institute of Photonic Technology Albert-Einstein-Str. 9 07745 Jena Germany

A curvature sensor based on an Fabry-Perot （FP） interferometer was proposed. A capillary silica tube was fusion spliced between two single mode fibers, producing an FP cavity. Two FP sensors with different cavity lengths were developed and subjected to curvature and temperature. The FP sensor with longer cavity showed three distinct operating regions for the curvature measurement. Namely, a linear response was shown for an intermediate curvature radius range, presenting a maximum sensitivity of 68.52 pm/m-1. When subjected to temperature, the sensing head produced a similar response for different curvature radii, with a sensitivity varying from 0.84 pm/℃ to 0.89 pm/℃, which resulted in a small cross-sensitivity to temperature when the FP sensor was subjected to curvature. The FP cavity with shorter length presented low sensitivity to curvature.

关键词： Curvature measurement Fabry-Perot interferometer optical fiber sensor

Influence of non-Hermitian mode topology on refractive index sensing with plasmonic waveguides

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Photonics Research 2022年第3期10卷 719-730页

作者： Alessandro Tuniz Markus A.Schmidt Boris T.Kuhlmey Institute of Photonics and Optical Science(IPOS) School of PhysicsThe University of SydneyNSW 2006Australia The University of Sydney Nano Institute(Sydney Nano) The University of SydneyNSW 2006Australia Leibniz Institute of Photonic Technology(ipht Jena) 07745 JenaGermany Abbe Center of Photonics and Faculty of Physics Friedrich-Schiller-University Jena07743 JenaGermany

We evaluate the sensing properties of plasmonic waveguide sensors by calculating their resonant transmission spectra in different regions of the non-Hermitian eigenmode *** elucidate the pitfalls of using modal dispersion calculations in isolation to predict plasmonic sensor performance,which we address by using a simple model accounting for eigenmode excitation and *** transmission calculations show that resonant wavelength and spectral width crucially depend on the length of the sensing region,so that no single criterion obtained from modal dispersion calculations alone can be used as a proxy for ***,we find that the optimal detection limits occur where directional coupling is supported,where the narrowest spectra *** narrow spectral features can only be measured by filtering out all higher-order modes at the output,e.g.,via a single-mode *** calculations also confirm a characteristic square root dependence of the eigenmode splitting with respect to the permittivity perturbation at the exceptional point,which we show can be identified through the sensor beat length at *** work provides a convenient framework for designing and characterizing plasmonic waveguide sensors when comparing them with experimental measurements.

关键词： waveguide mode narrow

Low-power emerging memristive designs towards secure hardware systems for applications in internet of things

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Nano Materials Science 2021年第2期3卷 186-204页

作者： Nan Du Heidemarie Schmidt Ilia Polian Department Nano Device Technology Fraunhofer Institute for Electronic Nano SystemsTechnologie-Campus 309126ChemnitzGermany Faculty of Electrical Engineering and Information Technology Chemnitz University of Technology(TU Chemnitz)Straße der Nationen 6209126ChemnitzGermany Department of Quantum Detection Leibniz Institute of Photonic Technology(IPHT)Albert-Einstein-Str.907745JenaGermany Institute for Solid State Physics Friedrich Schiller University JenaFürstengraben 107743JenaGermany Institute of Computer Engineering and Computer Architecture(ITI) University of StuttgartPfaffenwaldring 4770569StuttgartGermany

Emerging memristive devices offer enormous advantages for applications such as non-volatile memories and inmemory computing(IMC),but there is a rising interest in using memristive technologies for security applications in the era of internet of things(IoT).In this review article,for achieving secure hardware systems in IoT,lowpower design techniques based on emerging memristive technology for hardware security primitives/systems are *** reviewing the state-of-the-art in three highlighted memristive application areas,*** non-volatile memory,memristive reconfigurable logic computing and memristive artificial intelligent computing,their application-level impacts on the novel implementations of secret key generation,crypto functions and machine learning attacks are explored,*** the low-power security applications in IoT,it is essential to understand how to best realize cryptographic circuitry using memristive circuitries,and to assess the implications of memristive crypto implementations on security and to develop novel computing paradigms that will enhance their *** review article aims to help researchers to explore security solutions,to analyze new possible threats and to develop corresponding protections for the secure hardware systems based on low-cost memristive circuit designs.

关键词： Memristive technology Nanoelectronic device Low-power consumption Miniaturization Nonvolatility Reconfigurability In memory computing Artificial intelligence Hardware security primitives Machine learning-related attacks and defenses

Growth temperature dependence of crystal symmetry in Nb-doped BaTiO_(3) thin films

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Journal of Advanced Dielectrics 2013年第2期3卷 27-32页

作者： Young Heon Kim Xubing Lu Marco Diegel Roland Mattheis Dietrich Hesse Marin Alexe Max Planck Institute of Microstructure Physics Weinberg 2 D-06120 HalleGermany Korea Research Institute of Standards and Science(KRISS)Daejeon 305-340 Korea South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006P.R.China Institute of Photonic Technology(ipht)D-07702 Jena Germany

Growth temperature effects on the microstructure of Nb-doped BaTiO_(3) thin films of the composition BaTi_(0.98)Nb_(0.02)O_(3) are studied using X-ray diffraction and transmission electron microscopy(TEM).Reciprocal space maps and electron diffraction patterns show that the a-axis lattice parameter increases and the c-axis parameter decreases with increasing growth temperature,indicating a decrease of ***-field TEM images show low and high densities of threading defects in films grown at low and high temperatures,*** observations are discussed in terms of a hindering of the cubic-to-tetragonal phase transition by a high defect density and a high unit cell volume.

关键词： Nb-doped BaTiO_(3) crystal symmetry threading defect X-ray diffraction transmission electron microscopy