The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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)...
Optical nano-antennas have been used for many applications in many contexts [1]. The possibilities to control both field enhancement and spatial distribution, to tune the resonant wavelength, and to design the local phase constitute unique assets that explain the popularity of plasmonic nano-antenna. In this work, we propose to use plasmonic nano-antennas integrated in a silicon photonic integrated...
Recently, we have developed the method of broadband Green's function with low wavenumber extraction (BBGFL) to investigate the problem of arbitrary shaped waveguides [1]. In the past, the Boundary Integral-the Resonant Mode Expansion (BIRME) [2, 3] method was applied to calculate the modes of an arbitrary shaped waveguide with a homogenous dielectric. In BIRME, a DC extraction is applied to remove...
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...
The total-internal-reflection (TIR) switch hasa lot of advantages as a true amplitude-control device, providing insensitivity to wavelength and mode of light and also to circumferential temperature. The TIR switches have been commercialized as the digital optical switch for optical communication systems, mainly based on polymer materials and thermo-optics. A representative example is a thermo-optic...
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...
Silicon photonics can potentially transform the photonics technology owing to its low-cost fabrication and large-scale integration advantages. To this end, integration density will be the key factors for its future development. This talk will review our work on high-density waveguide integration based on waveguide superlattices. Half-wavelength pitch waveguide arrays with very low crosstalk have been...
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...
With the development of intelligent broadband optical networks, tunable semiconductor lasers are becoming more and more important for wavelength routing and signal processing. A simple and compact widely tunable laser has recently been developed using half-wave coupled V-cavity. The size of the chip is only about 500 µm×300 µm, and the fabrication process is similar to a simple Fabry-Perot laser....
The surface wave modes on right-handed helically grooved metal wire waveguide and left-handed one were studied and compared. It was found that for the helically grooved waveguide, the normal degenerate HE1 SSPP (spoof surface plasmon polaritons) mode decompose into two opposite circularly polarized modes, i.e., HE − 1 and HE + 1 SSPP modes due to the chirality of helical grooves. The divarication...
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...
Introduction: In the past decades, fiber-to-the-home access networks, chip-to-chip interconnects, and on-chip optical interconnects have gain widespread interest owing to the inherent advantages of large bandwidth, high signal noise ratio, small size and low power consumption. Because of the compatibility with existing complementary metal-oxide-semiconductor (CMOS) technology, Si photonics became...
Non-Hermitian systems with parity-time (PT) symmetry complex potential can exhibit phase transition when the degree of non-Hermiticity is varied. The existence of exceptional point (EP), at which two eigenstates coalesce, gives rise to a great variety of novel phenomena in various fields of physics. In real optical system, e.g., waveguides and photonic crystals, the complex conjugate distribution...
Hyperbolic metasurfaces (HMS) combine the potential for chip-scale integration of optical metasurfaces with the properties of hyperbolic dispersion. In the ideal, lossless effective medium limit, HMS have an unbound optical density of states (DOS). The unbound DOS enables infinite mode densities in waveguides and cavities, and, in principal, an infinitely confined modal energy. The finite periodicity...
We present a novel concept for broadband frequency conversion in silicon-organic hybrid devices and open up the pathway to use this ansatz for efficient THz sources based on the silicon photonic platform.
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...
Plasmonics is a potential route to optical devices that generate intense localized electric fields with unique capabilities in nonlinear optics. Many predict that sub-wavelength optical systems will be essential in the development of future optical integrated circuits, but realising this potential will be contingent on the ability to exploit plasmonic effects with semiconductor materials. Furthermore,...
Transformation optics is a hot topic for nanophotonics, since it provides a direct way to manipulate light as people's will. So it can be used as a new design tool for the integrated optical device on-chip. But it often requires the materials' permeability and permittivity in a tensor form, which is difficult to be realized by the meta-materials in the regime of the visible and communication wavelength...
We review the experimental progress on the research on quantum dots embedded in planar photonic circuits, which has recently matured to become a platform for fundamental studies of light-matter interaction as well as a serious contender for photonic quantum technology [1, 2]. Recent highlights include the demonstration of deterministic chip-scale single-photon sources [3] and nonlinear optics at the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.