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.
A method for thermal-stabilization of silicon microdisk resonators, based on thermooptic polymer coatings, is proposed. Two orders of magnitude improvement in thermal stability is expected. Effects on Q and major fabrication challenges are discussed.
Silicon photonics technologies are potentially useful in quantum information and communication experiments. This talk describes the first entangled photon-pair generation experiment to use a silicon wire waveguide, and discusses the application of silicon-based entanglement sources in quantum communication systems.
We have investigated the fabrication and characterization of 3-dimensionally confined optical microcavities on Si formed by self-assembled InGaAs/GaAs quantum dot microtubes. Such microcavities on Si are free of defects and exhibit a Q-factor of 3,000.
Si-nc light emission, overcoming limitations of c-Si, is described by a rate equation formalism within the ADE-FDTD scheme. Following this scheme, we design a series of resonant devices which tune and enhance the Si-nc luminescence.
A cladding-modulated Bragg grating implemented using periodic placements of silicon cylinders in the cladding along a silicon waveguide is proposed. Modeling results are verified experimentally, demonstrating coupling strengths differing by an order of magnitude.
We propose and analyze 3- and 5-layer sub-wavelength silicon-based plasmonic waveguide switches. Above-bandgap femtosecond pump pulses are used to modulate 1550 nm signals with switching time ~5 ps and high on/off contrast ratio of 23 dB.
We demonstrate a fast integrated germanium photodetector above 40 GHz and its integration with a silicon microring resonator-based wavelength division demultiplexer.
We summarize recent work in germanium quantum well physics and devices, in nanophotonic and nano-metallic structures for enhanced photodetection, and in fundamental limits to optical components, for applications such as slow light and optical interconnects to silicon.
A p-ridge single quantum well thin film laser has been metal/metal bonded onto silicon for good thermal dissipation and low threshold current. The threshold current density is 244 A/cm2.
We demonstrate a silicon diffractive element that serves as an optical tweezer in the near infrared and as a fluorescence collector in the visible. The 1.3 NA lens is achromatic and has high diffraction efficiency.
Ballistic charge currents are injected into Ge and Si and pure spin currents into Ge using quantum interference techniques and are spatially and temporally resolved for the first time.
We report measurement of the fundamental component of frequency noise in a micro-Raman laser fabricated on a silicon chip. A frequency noise spectral component that is equivalent to a Schawlow-Townes linewidth of 3-Hz is measured.
In this tutorial, I will review the main approaches developed so far to engineer efficient light emission from silicon-based materials. I will discuss the physics of radiative recombination in silicon nanostructures embedded in different dielectric matrices and I will picture the state of the art for on-chip optical amplifiers and silicon laser devices. In addition, I will introduce novel device concepts...
We investigate the use of gratings on porous silicon structures for sensing applications. Examples of two classes of systems are studied: grating-coupled waveguide biosensors, and diffraction-based biosensors.
We present Purcell-enhanced spontaneous emission of colloidal near-infrared quantum dots in silicon photonic crystal waveguides. The lead sulfide quantum dots demonstrated slow-light enhancement from the large local density of states at the band edge.
We report visible (green) third-harmonic generation in silicon by launching near-infrared picosecond pulses into highly confined photonic crystal waveguides. We demonstrate slow light enhancement of this nonlinear process.
We report on a highly efficient grating coupler between an optical fiber and a silicon photonic circuit. Using layers of Si/SiO2 as a Bragg mirror and amorphous Si we have measured a coupling efficiency of 69.5%.
We propose and analyze a parallel-coupled dual racetrack-ring silicon modulator. Our simulations show that a wide variety of advanced modulation formats such as QPSK and 16-QAM can be achieved in such a structure.
All-planar integration of a light source with coupling waveguide on a Si chip is achieved using high-Q, Er doped silicon-rich silicon nitride (SRSN) microdisks and SU-8 waveguide. As-fabricated microdisks show Q-factors of 1-1.5 times 104 for both TE- and TM-like modes. Upon integration with single-mode SU-8 waveguide and clad with a polymer layer, Q-factor decreases to 5,000 for the TE-like mode,...
We demonstrate ultra-broadband low-peak-power frequency conversion of continuous-wave light in a silicon photonic structure via four-wave mixing. Our process produces continuous conversion over two-thirds of an octave from 1241-nm to 2078-nm wavelength light.
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.