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The mode properties of metal-coated nanocylinder resonators are numerically investigated for realizing directional emission. The metal confinement layer not only reduces the radiation loss greatly but also introduces a great metal dissipation loss. The compromise of the metal dissipation loss and the output coupling is investigated accounting the destructive interference of leakage waves. The TE and...
Siliconphotonics modulators based on carrier depletion are a promising approach for optical interconnects due to their outstanding high-speed capabilities, fabrication with CMOS compatible processes and high reliability. The mainstream configurations are two-fold: ring resonator modulators (RRM) and Mach-Zehnder interferometer modulators (MZM). RRMs leverage the resonance enhancement to reach high...
We review our recent work on nanophotonic waveguide devices. We shall discuss structures which efficiently couple light into a plasmonic slot waveguide, and the use of a hyperuniform disordered photonic bandgap structure to make a highly compact waveguide polarizers. Nanoscale photonic integration was successfully used to demonstrate the monolithic integration of 850 photonic components on a CMOS...
Optical arbitrary waveform generation (OAWG) plays a critical role in many applications, such as generating optical ultra-wide band (UWB) signal, optical pulse radar, all-optical temporal differentiator, and test of optical communication system. Although lots of OAWG schemes were reported using mature fiber grating techniques, one of the most promising solutions is prone to be the miniaturization...
Coupled mode theory (CMT) can be traced back to 3 decades ago, and has been an indispensable tool of analyzing and designing waveguides, resonators, couplers or many other devices from microwave frequency to optical frequency [1], in both time and space domain. In the presence of loss and gain, the coupled mode equation on describing the mode hybridization of various waveguides or cavities, or cavities...
Asymmetric transmission or optical-diode behavior have very important applications in information technology, such as directionally-sensitive beam splitting, multiplexing, and optical interconnection. Here, we propose an all-dielectric chiral metamaterial to realize asymmetric wave transmission in far-infrared band. Made of Si-based double L-shaped resonators on both sides of SiO2 substrate, the three-layered...
The development of integrated approaches for optical trapping, based on photonic or plasmonic structures fabricated on a chip, offers several compelling advantages. First, chip-based optical traps enable the trapping platform to be miniaturized. Second, the chip-based configuration lends itself naturally to the incorporation of sensing modalities. Third, optical nanostructures can generate strong...
Nanostructured optical resonators allows colors on surfaces to be controlled precisely by geometric control using advanced nanofabrication tools. With components consisting of metals, and dielectrics, a range of different nanostructure designs have been investigated in its ability to generate colors when white light reflects off the surfaces. For instance, the original structures for plasmonic color...
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...
In this talk, we discuss realistic metamaterial structures to realize the concept of real-space gauge field. Light propagation can be modified in conventional optical media by changing the sizes and the shapes of their dispersion surfaces. Alternatively, a real space gauge field approach can also manipulate light propagation by shifting the centers of the dispersion surfaces [1–4]. Such a real space...
Over the past seven years, the coherent digital optical transmission enables a new generation of high speed optical communication. Coherent transmission technologies have delivered improvement in the capacity-reach product for long-haul fiber optic transmission systems. The coherent digital optical transmission is able to reach bit rates up to 100 Gbit/s. One of the keys of the ideal coherent optical...
Optical waveguide sensors based on silicon-on-insulator (SOI) nanowire have received great interest due to their potential applications in many fields including bacteria and virus detection, medical diagnostics, food quality control, environment monitoring, and drug development. Various types of SOI sensors have been developed, including Mach-Zehnder interferometer, microdisks and microing resonators...
This paper provides a printed anti-interference antenna with excellent wide tunable and reconfigurable multiple filtering bands for ultra-wideband applications. The anti-interference characteristics are realized by the use of stubs and resonators to filter out unwanted narrowband signal interferences. Also, the wide tunable filtering function is implemented by adjusting the dimensions of these designed...
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...
We report our recent progress in characterizing sub-bandgap surface-state absorption (SSA) and defect-state absorption (DSA) in foundry-fabricated silicon waveguides and microring resonators in 1310–1550nm wavelengths. While SSA is widely regarded as a fundamental linear absorption loss due to surfaces and interfaces for silicon waveguides and microring resonators, our previous work has shown that...
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,...
Over the past two decades, great efforts have been made in the study of routing and manipulating light waves at the subwavelength scale with open nanostructures such as photonic crystal waveguides (PCWs), surface plasmon waveguides (SPWs), and coupled resonator optical waveguides (CROWs), for their great potential in many photonic technologies such as highly integrated photonic signal-processing systems...
In this work, we experimentally explore the possibility to circumvent some drawbacks of silicon ring-resonator index sensors [1, 2] by a new approach relying on the detection of the micro-ring resonator spectrum overall envelope. In the purpose of strong light-matter interaction, slot waveguides have been considered to operate in the near infra-red [3]. As a proof-of-concept experimental study, hollow...
Optical frequency conversion is an essential building block of nanophotonics, whose application ranges from tunable light sources for classical on-chip communications to miniaturized telecommunications-band interfaces for quantum information science [1]. In the widely-used silicon photonics platform (including silicon nitride and silicon dioxide), a majority of reported frequency conversion experiments...
In the last number of years, optical cavities which are collectively known as whispering gallery resonators (WGR) have shown their versatility across a number of research fields from photonics applications, through fundamental studies in cavity optomechanics, to sensing. One type of WGR that has more recently been developed is the bottle-like microresonator (BLMR) [1] or microbubble [2], i.e., hollow...
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