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检索条件"任意字段=Conference on Optical Materials and Biomaterials in Security and Defence Systems Technology XVI"

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Graphene-based electronic devices for radiation detection and thermosensing 2

Graphene-based electronic devices for radiation detection an...

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II 2024

作者： Behera, Saraswati Chalmers University of Technology Gothenburg Sweden

ISBN: (纸本)9781510681187

Single-layer-CVD graphene is grown and integrated into passive electronic interfaces through a cost-effective optical fabrication approach. Raman characterizations are carried out to verify the single-layer nature of the grown graphene. The realized antenna-free, non-gated, and passive electronic device with Ge/Au contacts to graphene shows radiation detection (94 GHz) and thermosensing (6K-120 K) based on the radiation-induced thermoelectric effects in graphene. Further, a Ti/Au contacted graphene electronic device is fabricated and characterized through current-voltage measurements at cryogenic temperatures (7-140 K). Ti-Au contacted electronic device shows thermo-resistive sensing that is applicable to negative temperature coefficient (NTC) thermistors. Application and future scopes of these graphene radiation detectors and thermosensors can be in temperature monitoring in graphene-integrated electronic and quantum devices, terahertz communications, thermal imaging, space, and environmental monitoring. © 2024 SPIE.

关键词： Microwave antennas

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optical materials and biomaterials in security and defence systems technology xvi

Optical Materials and Biomaterials in Security and Defence S...

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optical materials and biomaterials in security and defence systems technology xvi 2019

The proceedings contain 3 papers. The topic discussed include: optical materials for printed interconnects and sensors;new type Cu(N3)2 metal-azides for laser initiation;and optical limiting properties of polymer-dye ... 详细信息

ISBN: (纸本)9781510630338

关键词： optical materials

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optical materials for Printed Interconnects and Sensors 16

Optical Materials for Printed Interconnects and Sensors

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conference on optical materials and biomaterials in security and defence systems technology xvi

作者： Aga, R. S. Ouchen, F. Kreit, E. B. Bartsch, C. M. Heckman, E. M. KBR 2601 Mission Point BlvdSuite 300 Dayton OH 45431 USA US Air Force Res Lab Sensors Directorate 2241 Avionics Circle Wright Patterson AFB OH 45433 USA

ISBN: (数字)9781510630345

ISBN: (纸本)9781510630345

This work explores additive manufacturing technology to fabricate hybrid circuits comprising of optical and electronic materials as photonic and electrical interconnects, respectively. Several polymeric optical materials have been investigated (including SU8, PDMS, UV15 and Norland adhesives) as waveguides directly printed on commercial circuit boards such as FR4 and Rogers TC600. An optical waveguide printed over RF (radio frequency) transmission lines and surface mount electronic components is demonstrated. As an application, the waveguide is used as an alternative to traditional electrical interconnects to control an RF switch for routing an RF signal from a single source to different locations. This work also investigates the feasibility of printed polymeric waveguides as a sensing platform for monitoring humidity and temperature changes in electronic circuits. Results show that the SU8 waveguide responds significantly to change in temperature and humidity and the response is appropriate for logistics applications such as cold chain supply.

关键词： additive manufacturing interconnects electronic integration printed electronics optical sensor

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optical limiting properties of polymer-dye nanohybrids: a comparison between polylactide and PMMA hosts 16

Optical limiting properties of polymer-dye nanohybrids: a co...

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conference on optical materials and biomaterials in security and defence systems technology xvi

作者： Muller, O. Hege, C. Guerchoux, M. Dandois, M. Trendel, P. Merlat, L. French German Res Inst St Louis ISL Lab Radiat Interact Matter 5 Rue Gen Cassagnou F-68301 St Louis France Univ Nottingham Fac Engn Dept Chem & Environm Engn Nottingham NG7 2RD England

ISBN: (数字)9781510630345

ISBN: (纸本)9781510630345

The widespread usage of harmful pulsed laser sources emitting brief but intense radiations implies to search for appropriate and convenient forms of protection. Nonlinear optical nanomaterials can serve this purpose when properly embedded in a solid medium, resulting in nanohybrid passive optical limiting filters. This work focuses on the optical limiting behavior of polymer-dye nonlinear nanohybrids, for which we combined azophloxine, a red azo-dye, with two polymer hosts, namely PMMA and polylactide (PLA). Transmittance measurements in the nonlinear regime were performed at the wavelength of 1064 nm with nanosecond pulses at a low pulse repetition rate. The nonlinear optical properties resulting from energy dependent transmittance assessments reveal that the dye concentration is of major relevance regarding the PMMA nanohybrids, and to a lesser extend for the PLA based systems. The PLA synthesis concept described in this study offers an easy way to directly attach the dye covalently to the polymer chain. The originality and novelty of this synthesis technique is to be pointed out since it has never been mentioned elsewhere to date. For the various types of nanohybrids investigated, significant differences in the optical limiting response were observed. A molecular model claiming for the dye aggregation in the PMMA nanohybrids is discussed. Two different absorption regimes responsible for the optical limiting action have been identified to be reverse saturable - excited state absorption on the one hand and multi-photons absorption on the other hand.

关键词： dyes nanohybrids laser protection optical limiting polylactide RSA MPA aggregation

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Exploring a Direct Printing Technique for Polymeric optical Interconnects and Modulators 15

Exploring a Direct Printing Technique for Polymeric Optical ...

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conference on optical materials and biomaterials in security and defence systems technology XV

作者： Aga, R. S. Kreit, E. B. Ouchen, F. Bartsch, C. M. Heckman, E. M. KBRWyle 2601 Mission Point BlvdSuite 300 Dayton OH 45431 USA US Air Force Res Lab Sensors Directorate 2241 Avionics Circle Wright Patterson AFB OH 45433 USA

ISBN: (数字)9781510621862

ISBN: (纸本)9781510621862

Direct printing technique has become indispensable in flexible electronics and low cost sensor applications. It has transformed into an enabling technology for many flexible devices. However, it is not very well explored for printing optical materials. In this work, a micro-dispense printer for printing polymeric optical waveguides was custom-built. It was employed to develop a simple method to couple light into printed optical interconnects. It was also used to apply a voltage bias during printing and drying of electro-optic polymer (SEO110) to pole the SEO110 in-situ with the goal of eliminating the need for traditional high temperature contact poling. With this in-situ poling method, electro-optic effect in SEO110 was demonstrated.

关键词： additive manufacturing interconnect optical modulator electronic integration printed electronics

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Analysis the effect of thermal load on the insertion loss of the optical couplers 15

Analysis the effect of thermal load on the insertion loss of...

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conference on optical materials and biomaterials in security and defence systems technology XV

作者： Nedoma, Jan Fajkus, Marcel Zabka, Stanislav Novak, Martin Jaros, Rene Martinek, Radek VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun Ostrava Czech Republic VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Cybernet & Biomed Engn Ostrava Czech Republic

ISBN: (数字)9781510621862

ISBN: (纸本)9781510621862

This article focuses on the analysis of the selected optical coupler parameter which have been thermal stressed for 30 weeks at temperature 95 degrees C +/- 5 degrees C. optical couplers with 10:90, 1:99 and 50:50 dividing ratio were tested. A total of 6 optical couplers were tested. Measurements were made for two wavelengths 1310 nm and 1550 nm. The observed parameter was the insertion loss. The insertion loss is very important parameter because the fiber-optic passive components (such as optical couplers) disrupt signal transmissions as the continuous core of the optical fiber carrying the signal mates with the component in a manner that causes some amount of scattering and reflection of light waves. The degree to which the signal has been depleted is described as insertion loss, which is the undesired attenuation of the signal measured in decibels (dB).

关键词： Thermal load optical coupler insertion loss

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A Comparison of Probes Based on Bragg Grating Sensor and Microphones for Heart Sounds Measurement 15

A Comparison of Probes Based on Bragg Grating Sensor and Mic...

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conference on optical materials and biomaterials in security and defence systems technology XV

作者： Martinek, R. Brablik, J. Soustek, L. Kolarik, J. Fajkus, M. Nedoma, J. Kahankova, R. VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Cybernet & Biomed Engn Ostrava Czech Republic VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun Ostrava Czech Republic

ISBN: (数字)9781510621862

ISBN: (纸本)9781510621862

This paper presents the comparison of fibre-optic Bragg Grating Sensor with the commercially available probes for heart sounds measurement based on microphones. The analysis of the sensitivity and specificity was carried out to assess the efficacy of the individual measuring probes. Since fibre-optic sensing uses light in optical fibre rather than electricity, it solves the limitations of electrical sensors such as transmission loss and susceptibility to electromagnetic interference (EMI). Experimental results have shown that Fibre-Optic Bragg Grating Sensor significantly outperforms the devices using the microphones. Moreover, the sensor embedded in polydimethylsiloxane polymer and is fixed on the thorax by means of elastic belt. The material is biocompatible and immune to electromagnetic interference, which is major advantage for the healthcare environment. The probe dimensions are small;therefore, it would be convenient for the patient and easily implemented into clinical practice. Nevertheless, the signal processing methods must be applied to separate the desired signal from the environmental noise.

关键词： Fibre-Optic Bragg Grating Sensor (FGB) Heart Sounds Microphones optical Fibre Signal Processing Methods

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Photoluminescence study of Yb³⁺/Er³⁺ co-doped Sb₂O₃-WO₃-Li₂O (SWL) ceramic phosphor for fingerprint detection in forensic science & security writing 15

Photoluminescence study of Yb<SUP>3+</SUP>/Er<SUP>3+</SUP> c...

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conference on optical materials and biomaterials in security and defence systems technology XV

作者： Sukul, Prasenjit Prasad Kumar, Kaushal Indian Inst Technol ISM Dept Appl Phys Opt Mat & Bioimaging Res Lab Dhanbad Bihar India

ISBN: (纸本)9781510621862

The article reports the development of invisible cryptography writing and latent fingerprint detection techniques using upconversion emission of rare earth doped ceramic for the application in forensic science. The upconversion (UC) emission studies on Yb3+/Er3+ co-doped Sb2O3-WO3-Li2O (SWL) ceramics under 980 nm laser excitation has been done. Due to its intense green and red visible emission, the ceramic finds a great application in developing latent fingermark detection using powder dusting technique. In addition to fingerprint detection, the present ceramic is a promising candidate for coding cyphers in invisible manner. An observed comparison between UV vs. NIR excited fingerprint images shows that fingerprint images exposed by NIR excitation have more clear edges than the UV excitations. Hence the current upconversion emission studies on the present ceramic samples reveal its potential application in forensic science, security writing and cryptography information (cypher).

关键词： Upconversion invisible cypher cryptography fingerprint detection

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optical AND PHOTOCHEMICAL PROPERTIES OF DIARYLETHYLENES 14

OPTICAL AND PHOTOCHEMICAL PROPERTIES OF DIARYLETHYLENES

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conference on optical materials and biomaterials in security and defence systems technology XIV

作者： Krupka, O. Smokal, V. Derkowska-Zielinska, B. Kolendo, A. Taras Shevchenko Natl Univ Kyiv 60 Volodymyrska UA-01033 Kiev Ukraine Nicolaus Copernicus Univ Torun Fac Phys Astron & Informat Inst Phys Grudziadzka 5 PL-87100 Torun Poland

ISBN: (纸本)9781510613454;9781510613447

In this study, the 2-(4-methacryloxystyryl) quinoline, 2-(4-methacryloxystyryl)-6-methoxyquinoline were synthesized. The polymers built from the free radical polymerization of methacrylic monomers incorporating the diarylethylenes sidegroup have been synthesized in dimethylformamide with azobisisobutyronitrile as initiator. The products of polymerization were characterized and evaluated by (HNMR)-H-1, UV spectroscopy. Thermal stability was characterized by DSC method. Their optical and photochemical properties as well as temperature dependence of the photoluminescence of diarylethylenes have been investigated.

关键词： Styrylquinoline photoisomerization photoluminescence radical polymerization

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Hybrid optical security system using photonic crystals and MEMS devices 14

Hybrid optical security system using photonic crystals and M...

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conference on optical materials and biomaterials in security and defence systems technology XIV

作者： Ciosek, Jerzy Ostrowski, Roman Mil Univ Technol Inst Optoelect 2 Kaliskiego St PL-00908 Warsaw Poland

ISBN: (纸本)9781510613454;9781510613447

An important issue in security systems is that of selection of the appropriate detectors or sensors, whose sensitivity guarantees functional reliability whilst avoiding false alarms. Modern technology enables the optimization of sensor systems, tailored to specific risk factors. In optical security systems, one of the safety parameters considered is the spectral range in which the excitation signal is associated with a risk factor. Advanced safety systems should be designed taking into consideration the possible occurrence of, often multiple, complex risk factors, which can be identified individually. The hazards of concern in this work are chemical warfare agents and toxic industrial compounds present in the forms of gases and aerosols. The proposed sensor solution is a hybrid optical system consisting of a multi-spectral structure of photonic crystals associated with a MEMS (Micro Electro-Mechanical System) resonator. The crystallographic structures of carbon present in graphene rings and graphenecarbon nanotube nanocomposites have properties which make them desirable for use in detectors. The advantage of this system is a multi-spectral sensitivity at the same time as narrow-band selectivity for the identification of risk factors. It is possible to design a system optimized for detecting specified types of risk factor from very complex signals.

关键词： security systems multi-spectral detection graphene carbon nanostructures drop filters

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