Optical Detection Technology Research Articles

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Optical detectors technology and applications

Call for papers: Optical detectors technology and applications

Call for papers: Optical detectors technology and applications

Call for papers: Optical detectors technology and applications

Call for papers: Optical detectors technology and applications

Preliminary call for papers: Announcing an issue of the IEEE Journal of Selected Topics in Quantum Electronics on optical detectors technology and applications

Preliminary call for papers: Announcing an issue of the IEEE Journal of Selected Topics in Quantum Electronics on optical detectors technology and applications

Call for papers: Optical detectors technology and applications

Call for papers: Optical detectors technology and applications

Call for papers: Optical detectors technology and applications

Call for papers: Optical detectors technology and applications

(Invited) Silicon Compatible High Performance Optical Interconnect Technology

High speed optical interconnects provide significant performance improvement and power savings over copper-based solutions in high performance computing and data networking applications. APIC's integrated components using wavelength division multiplexing have been demonstrated for avionics networking. Extension of this technology to the chip scale enables multicore processors to be networked using optical interconnects, extending the performance and power benefits to large scale multicore processors. CMOS fabrication compatibility necessitates that the optical transmitters and receivers and other link components be silicon based, which we implement using epitaxial germanium. APIC has demonstrated both optical transmission and detector technology using germanium in silicon and is working on transitioning the fabrication process to a production foundry. Here we show recent results of germanium optical receivers and, more significantly, demonstration of strained germanium optical sources integrated in a silicon chip. The optical link is suitable for integrated chip-scale fabrication.

The Application of the Optic Sensor in the Monitoring on the Transmission Lines

Three technologies of insulator online monitoring based on optic fiber sensors is described in proposed paper, including optic fiber sensor salt density technology, optical fiber composite insulator monitoring technology and optical sensor insulator surface electric field detection technology. According to measuring insulator surface ESDD, the internal stress and the temperature distribution of the composite insulators and insulator surface electric field values. these technology can monitor the operation performance of insulator. These techniques that improve the existing insulators monitoring methods has a strong innovative and practical application prospects.

Immunosensing using a metal clad leaky waveguide biosensor for clinical diagnosis

The optical detection technologies have been used in biosensors for the highly sensitive, real-time and label-free detection of biomolecules. In this report, a metal clad leaky waveguide (MCLW) was used as an immunosensing tools. We optimized the structure of the sensor chip for highly sensitive detection, followed by fabrication of the MCLW sensor chips and construction of a detection system for immunosensing. Titanium and SiO2 films were deposited onto a BK7 substrate using an E-beam evaporator and the thickness of the films was 9 nm and 347 nm, respectively. The sensing response of the system to the bulk refractive index was calibrated using various concentrations of a glycerol solution. As a result, the MCLW sensor system was able to detect a change of ∼3.8 × 10−6 RIU in the refractive index of the ambient solution. In addition, immunosensing was achieved using the MCLW sensor for an antigen–antibody reaction in real time. The biotin-labeled antibody of human interleukin 5 (hIL5) was immobilized on the sensor surface containing modified with streptavidin. The hIL5 in a bio-solution was quantitatively analyzed in real time using the MCLW sensor system.

Characterization of Polymorphic States in Energetic Samples of 1,3,5-Trinitro-1,3,5-Triazine (RDX) Fabricated Using Drop-on-Demand Inkjet Technology

The United States Army and the first responder community are evaluating optical detection systems for the trace detection of hazardous energetic materials. Fielded detection systems must be evaluated with the appropriate material concentrations to accurately identify the residue in theater. Trace levels of energetic materials have been observed in mutable polymorphic phases and, therefore, the systems being evaluated must be able to detect and accurately identify variant sample phases observed in spectral data. In this work, we report on the novel application of drop-on-demand technology for the fabrication of standardized trace 1,3,5-trinitro-1,3,5-triazine (RDX) samples. The drop-on-demand sample fabrication technique is compared both visually and spectrally to the more commonly used drop-and-dry technique. As the drop-on-demand technique allows for the fabrication of trace level hazard materials, concerted efforts focused on characterization of the polymorphic phase changes observed with low concentrations of RDX commonly used in drop-on-demand processing. This information is important when evaluating optical detection technologies using samples prepared with a drop-on-demand inkjet system, as the technology may be "trained" to detect the common bulk α phase of the explosive based on its spectral features but fall short in positively detecting a trace quantity of RDX (β-phase). We report the polymorphic shifts observed between α- and β-phases of this energetic material and discuss the conditions leading to the favoring of one phase over the other.

915 Development of Novel Optical Technologies for Early Colon Carcinogenesis Detection via Nanoscale Mass Density Fluctuations: Potential Implications for Endoscopic Diagnostics

Our group has been at the forefront of developing light scattering technologies (Nature 2000, Nat Med 2001, Gastro 2004, Clin Cancer Res 2006) and we have applied to cancer screening (reviewed in Gastro 2011). Our suite of technologies are sensitive to particle sizes from 50-500 nm thereby providing unprecedented insights into the nano-structural consequences of the genetic/epigenetic alterations in field carcinogenesis (Clin Cancer Res 2007, Gastro 2008, Cancer Res 2009). To maximize diagnostic performance, two critical issues need to be addressed, 1.

Surface Measurement of GLSI Wafer with Copper Interconnects after CMP

Chemical mechanical polishing (CMP) is the best global planarization technology of GLSI process. After CMP process, there may appear large roughness, micro scratch, dishing pit, erosion pit, with-in-wafer-non-uniformity (WIWNU), organic contamination, particles and metal ions pollution on wafer with copper interconnects. Surface measurement of CMP process on the wafer mainly involves the test of roughness, defects and the contaminations. Atomic force profiler (AFP) combined with the resolution of the AFM and long-range-scan ability of the steps instrument (100 mm), is suitable for CMP process which needs to measure both the planarization of long-range scanning and tungsten plug and copper interconnects with high resolution imaging. Optical detection technology combined with the advantages of dark and bright view detection is suitable for detection of particles, crystal originated pits (COP), defects, etc. The time-of-flight static secondary ion mass spectrometry (TOF-SIMS) and total reflection X-ray fluorescence (TXRF) are applicable to detect metal ions. The selection and use of advanced data analysis theory and method can help to improve the speed of analysis and to find the main factors of influence surface quality. Pareto diagram analysis is very beneficial for study polishing effects and the main reason of the surface state for Cu-CMP wafer. Nine sampling method and five sampling method fit to analysis the uniform surface distribution, on the contrast isometric sampling can reflect the distribution of the surface state along the radius difference.

Research on All Fiber-Optical Fluorescence System Measuring Mineral Oil in Water

A fluorescent optical fiber measuring system used to measure the concentration of the mineral oil in water is put forward in this paper according to the mechanism that the mineral oil in watercan emit fluorescence when excited by ultraviolet light. The pulse xenon lamp is used as excitation light source, while the linear CCD is adopted as the fluorescent signal of photoelectric detection components instead of the traditional photomultiplier tube in the system, combining with the optical fiber sensor technology and weak signal detection technology. It also equipped with the data acquisition card to realize data receiving and A/D conversion, using micro computer to store and display the data. This in turn realizes the accurate measurement of the concentration of mineral oil in water. The fluorescence optical fiber measuring system that used to measure the concentration of the mineral oil in water has the characteristics of simply structure, high sensitivity, wide linear range, probe passive and so on. The experimental result shows that this method is completely feasible.