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Plasmonic waveguide, e.g., metal-dielectric-metal (MDM) waveguide, utilizes surface plasmon polariton (SPP) to confine the light propagation in deep sub-wavelength. As the light wave is evanescent in the direction perpendicular to the interface, it couples to side placed resonators, yielding intriguing modulation phenomena, such as Fano resonance and electromagnetically induced transparency (EIT)...
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...
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 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...
Resonance phenomenon in general allows large responses from small inputs. This effective amplification effect has been in successful use in diverse range of sensing applications. More specifically, in case of optical resonances, various micro- and nano-resonator designs have been proposed so far with a large range of performance parameters. On the one hand, micro-scale dielectric resonators can provide...
We propose a reflective linear polarization converter with broadband and high-efficiency using ladder-shaped resonator (LSR) structure metamaterial (MM) based on multi-reflection interference theory. Three resonances generated by LSRs contribute to the expansion of working frequency range while the interference theory is employed to explain the characteristic of high-efficiency polarization conversion...
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...
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...
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...
Frequency selective surfaces (FSSs) are planar structures composed of a periodic array of unit cells that filter electromagnetic (EM) waves impinging on the surfaces. They have been widely used in stealth technology, electromagnetic countermeasure, and communication systems [1, 2]. Typical FSSs are composed of metallic grids or dipole arrays, which exploit the strong interactions between EM waves...
With unique possibilities for controlling light in nanoscale devices, graphene has opened new perspectives to the nanophotonics community with potential applications in metamaterials, modulators, photodetectors, and sensors. Following a brief introduction of graphene, I will address some fundamentals, such as excitation of graphene plasmon polartions [1], pushing graphene plasmons to low wavelengths,...
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...
In this paper, we propose and demonstrate a multi-layered chiral structure consisting of a y-shape, a half-gammadion and an S-shape which possesses the property of asymmetric transmission for both linearly and circularly polarized waves in microwave frequency band. Numerical simulated results indicate that the chiral structure realizes a maximum asymmetric transmission of 0.88 and 0.31 for circularly...
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...
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...
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 article presents results of numerical modelling of planar resonators arrays deigned for THz frequencies. The increase in the resonant frequency of each array's element is achieved by down-scalling its dimensions. Accompanying effects, as the rise of resistive metal losses are examined also. The presented results have shown the possibilities of down-scalling the geometry of basic planar 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...
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...
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