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 materi...
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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 opticalmaterials 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.
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 w...
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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.
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 explo...
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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 opticalmaterials. 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.
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 div...
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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).
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 carr...
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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.
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 up...
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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).
The proceedings contain 7 papers. The topics discussed include: fiber-optic sensors encapsulated into biocompatible polymer material for monitoring the heart rate of the human body;analysis the effect of thermal load ...
ISBN:
(纸本)9781510621855
The proceedings contain 7 papers. The topics discussed include: fiber-optic sensors encapsulated into biocompatible polymer material for monitoring the heart rate of the human body;analysis the effect of thermal load on the insertion loss of the optical couplers;a comparison of probes based on Bragg grating sensor and microphones for heart sounds measurement;exploring a direct printing technique for polymeric optical interconnects and modulators;and light amplification and photo-isomerization characteristics of laser dyes and azo molecules incorporated into DNA-complex systems.
作者：
Dengler, S.Eberle, B.Fraunhofer IOSB
Institute of Optronics System Technologies and Image Exploitation Department Optronics Gutleuthausstraße 1 Ettlingen76275 Germany
Many carbon-based nanomaterials exhibit nonlinear optical response under intense laser radiation what makes them promising candidates for laser protection devices. They strongly attenuate intense laser light, while ex...
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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 di...
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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.
An important issue in securitysystems is that of selection of the appropriate detectors or sensors, whose sensitivity guarantees functional reliability whilst avoiding false alarms. Modern technology enables the opti...
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ISBN:
(纸本)9781510613454;9781510613447
An important issue in securitysystems 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 opticalsecuritysystems, 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.
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