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Point of care testing (POCT) systems, are widely used to firstly, diagnose and secondly, monitor a number of illnesses and infectious diseases. This research aims to develop the integration between an optical fluorescence system and a microfluidic chip - through the use of advanced manufacturing techniques, such as anisotropic wet etching of Silicon (Si) wafers. The fabricated Si microfluidic chips...
We introduce a novel approach for photo-induced modulation of THz resonances using organometal trihalide perovskites. In contrast to equivalent devices based on conventional semiconductors or graphene, a wide variety of different perovskites, with tunable chemical compositions, can be either solution processed or thermally deposited on to desired substrates. We demonstrate 100% depth of modulation...
Unification of plasmonics and all-dielectric nanophotonics in one system offers advantages in terms of light manipulation at nanoscale. In this work we demonstrate a novel type of asymmetrical hybrid nanostructures fabricated via combination of conventional lithographical methods with fs laser reshaping at nanoscale. The method of such type structures fabrication makes possible accurate engineering...
For the first time, an ultra-compact integrated isolator without use of permanent magnets is designed and fabricated by bonding Ce:YIG on a silicon microring. Record isolation of 32dB and low 2.3dB excess loss were achieved.
A non-blocking 16×16 silicon electro-optic switch based on Benes network was demonstrated. The extinction ratios of the switch are 20.2∼29.8 dB. It consists of 56 MZI switch units, whose switching time are 1 nanosecond.
We investigated hybrid-integration of InP semiconductor optical amplifier on silicon photonics chip using flip-chip bonding, and achieved in-line optical amplification of 10 dB. Silicon 1×8 splitter and selector are fabricated and operated with on-chip loss-compensation.
Rapid growth in the demand for data traffic has facilitated the introduction of high-capacity digital coherent transmission for long-haul optical fiber networks. For successful digital coherent transmission to metro-area networks or shorter ranges, the cost and size of transmission equipment and its components must be further reduced. Silicon photonics is a fascinating technology to meet this requirement...
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...
Silicon photonics offers a promising integration platform facilitating chip-scale optical signal processing. We review recent research progress in integrated optical signal processing with silicon platform by employing advanced multi-level modulation formats. Using fabricated silicon waveguides, gratings, couplers, microring resonators, vertical slot waveguides and hybrid plasmonic waveguides, we...
Photonic crystal (PhC) nanobeam cavities have attracted increasing attention owing to the advantages of high Q-factor, small mode volume and no limitation of FSR. Various PhC cavities have been developed for optical communications, optical sensors, optomechanics, etc.. We investigate the design, fabrication, and experimental characterization of high quality factor PhCnanobeam cavities on silicon....
We address recent progress in large-area precise nanofabrication of metasurfaces using UV nanoimprint lithography. Metasurfaces for enhancing optical signals in molecules and for manipulating polarization of light are introduced.
We fabricated ZnO/Ag nanogratings and P3HT-coated Si nanopillar (NP) arrays using nanoimprint and electron-beam lithography techniques, respectively. Experimental and calculated results revealed intriguing optical characteristics of these nanostructures. The grating structure could couple surface plasmon polaritons (SPPs) with photons, giving rise to strong light confinement at the ZnO/Ag interface...
Nitrogen vacancy (NV−) centers possess exceptional sensitivity to magnetic field even under ambient condition. The optically detectable electron spins and the atomic size make it a promising candidate for advanced magnetic resonance imaging (MRI) technique with nanoscale spatial resolution. In this work, diamond particles with NV− centers were deposited by microwave plasma chemical vapor deposition...
Using the Smart CutTM technology, we fabricated 200 mm optical Germanium-On-Insulator (GeOI) substrates for photonic applications. The high crystalline quality of the Ge layer opens the way to wafer-scale fabrication of photonic components such as new light emitting devices based on highly-tensile strain.
The light emission from Ge quantum dots are in the range of 1.3 to 1.6 µm which is the telecommunication wavelengths. Light-emitting devices based on Ge quantum dots embedded in optical microcavities are one possible solution for Si light source. In order to enhance the light emission, we embed Ge self-assembled quantum dots into various Si microcavities. Due to the Purcell effect, the light emission...
Silicon-based optical micro-ring resonators (MRRs) are very popular for many application because of the ultra-compact footprint and easy fabrication. The wavelength-selectivity property of MRRs makes it possible to be used not only as an optical filter with a narrow bandwidth but also as an optical sensor with high sensitivity. This paper gives a review of our recent work on the MRRs on silicon. First,...
The high power consumption and limited bandwidth of conventional metal interconnects has become the main obstacle to the extension of Moore's Law. Optics is the perfect solution because of its broad bandwidth, low latency, low power consumption, and low crosstalk. The hybrid III–V-on-Si platform has been developed extensively recently as a promising integrated platform to build robust Si-based light...
Bragg gratings are one of most powerful basic components for optical signal processing. They have been intensively used to construct various functional devices, such as lasers, modulators, WDM filters, optical delay lines, dispersion compensators, sensors etc. The Bragg grating can be regarded as one-dimensional photonic crystal whose performance can be easily tailored by changing the grating parameters...
A TE-pass polarizer based on hybrid plasmonic Bragg grating for silicon-on-insulator platform is proposed. The structure greatly eases alignment tolerance compared with traditional plasmonic devices. An extinction ratio over 18 dB within bandwidth of 220 nm is achieved with compact length of 5.04 μm.
We propose CMOS-compatible multi-layered waveguide system for silicon hybrid integration. Numerical simulation of vertical light coupling between different layers, and fabrication of dual-layered waveguide devices for multiple die-to-wafer bonding are performed, suggesting the integration feasibility.
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