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In this work we demonstrate, for the first time, the feasibility of making rapid fluorescence lifetime measurements with analog silicon photomultipliers (SiPMs) and waveform sampling techniques. Fluorophore excitation was provided by means of a low-power fiber-coupled pulsed laser diode operating at 405nm, whose beam had been expanded to a diameter of 2mm before impinging upon the sample. A portion...
The aims of this study were to evaluate the clinical feasibility of using an Electronic Portal Imaging Device (EPID) for patient position verification, and to analyze for the EPID's limiting factor in the use of patient setup verification. The investigation involves 15 patients with different carcinomas. All of them were initially positioned by using a three-point laser alignment method and received...
We demonstrate a very low loss coupler between a silicon nanowire waveguide and ultra-low loss (less than 2 dB/m) silicon nitride waveguide. Coupling between layers is achieved loss below 0.1 dB per transition over 50 nm of bandwidth.
We present the design of a novel 8 channels system for time resolved optical tomography based on Silicon Photomultipliers (SiPMs), therefore knocking down cost and complexity of this technique and paving the way to a widespread diffusion. We validated the system performances on phantoms.
The group of the Huazhong University of Science and Technology developed the technology of the Silicon Photo-multiplier on the basis of standard CMOS technology, produced on the CMOS chinese facility. The performance of the SiPM is presented with detailed analysis, particularly the single photon spectrum.
We review recent advances in heterogeneous silicon photonic integration technology and components and describe progress in silicon photonic integrated circuits. Techniques for laser integration and the impact of active silicon photonic integrated circuits could have on interconnects, telecommunications and silicon electronics are reviewed. A variety of materials are being heterogeneously integrated,...
Submicron thin film of lithium niobate are heterogeneously integrated on silicon substrates and rib-loaded with index-matching materials for compact waveguide formation. High-Q microring modulators and low-voltage and high-modulation-depth Mach-Zehnder modulators are demonstrated. The devices have high potential for digital (datacom) and analog (microwave photonic) applications.
In this paper we outline our work towards high sensitivity graphene-based detectors at X-Ray, Terahertz and visible frequencies. We present our current experimental results showing our energy sensitivity and outline potential improvements to our designs to increase this sensitivity.
CexTb3−xFe5O12 (Ce:TIG) films (Faraday rotation = −2600°/cm) were grown on Si and quartz substrates without seedlayers. Silicon-on-Insulator (SOI) waveguide simulations were done on devices with Ce:TIG-claddings and compared with CexY3−xFe5O12 (Ce:YIG) claddings grown on YIG-seedlayers. Results show that Ce:TIG-claddings are three times more efficient than Ce:YIG/YIG claddings.
This paper describes increased chip productivity using a laser dicing technique called stealth dicing (SD), in which optimized aberration correction is applied. By optimizing aberration correction, the dicing street width is reduced to approximately one-fifth of that achievable by blade dicing (BD). With SD, the total number of 1 mm × 1 mm dies singulated from a wafer was 13.3 % higher than with BD...
In this paper we demonstrate the potential use of a germanium p-i-n diode, available without additional processing effort in a photonic BiCMOS technology, for electronic applications. A cut-off frequency above 400 GHz was obtained by S-parameter measurements without any certain design optimization of the diode. The device construction on SOI yields in the isolation of the diode from the substrate...
We demonstrate coupling of surface and edge emitting InP lasers to silicon photonic chips using photonic wire bonding. We confirm that back-reflections from the silicon chip do not deteriorate the linewidth of the lasers.
We present a platform for the feedback control of a multichannel transmitter based on DML sources and a silicon photonic multiplexer and carver circuit. Automatic tuning and wavelength locking are demonstrated in about 150 ms.
Silicon photonics typically builds on a silicon-on-insulator based high-index-contrast waveguide system. Silicon nitride provides an alternative moderate-index-contrast system that is manufacturable in the same CMOS environment. This paper discusses the relative benefits of both platforms.
3D electro-optical integration based on a Cu-based Si-photonics TSV interposer has been demonstrated for integrated optical communication applications. The photonics TSV interposer consisting of monolithically integrated TSV, modulators and photodetectors, enabling a 30 Gbps-data-rate.
We demonstrate a 2×2 multimode interference coupler in 220 nm silicon photonics, with 3.8 μm by 152 μm footprint. Loss is <0.15±0.01 dB for 1530–1565 nm, across the 200 mm wafer using 248 nm lithography. This is the lowest loss reported for sub-micron silicon 2×2 MMI.
This paper reviews 2D and 3D photonic integrated circuits and their applications in computing, networking, and signal processing. Various novel fabrication techniques leading to realization of chip-scale microsystems, and future prospects will also be discussed.
According to the Bloch theorem and the symmetry of superlattice configuration, a new 3D finite element method is employed to calculate the miniband structure and density of state for well-aligned Ge/Si QDs array. This method can overcome the approximation of multi-dimensional Kronig-Penny model and constrain on QDs superlattice structure. The interaction of electronic structure among Ge/Si QDs with...
We will present our work on epitaxially grown III-V on silicon DFB laser arrays, including results of pure InP-based lasers emitting around 900nm and InGaAs-on-InP lasers emitting around 1300nm.
Optical modulators are central to a large number of applications in photonics particularly in the area of communication as they provide the function of writing electrical data onto an optical carrier. Silicon photonics provides a route to the realisation of low cost photonic integrated circuits through fabrication which is synonymous with CMOS electronic fabrication, i.e., high volume and high yield...
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