Massachusetts Institute of Technology

Omniguide Communications

Lockheed Sanders, Inc.

Other

Harvard College

University of Central Florida Research Foundation Inc

Technion Research & Development Foundation Ltd

Boston University

Flir Systems, Incorporated

M.i.t.

John Dimitris Joannopoulos

Marin Soljacic

Aristeidis Karalis

Yoel Fink

Steven G Johnson

Shanhui Fan

Pierre R Villeneuve

Mihai Ibanescu

Fabien Sorin

Ofer Shapira

Peter H Fisher

Andre B Kurs

Robert D Meade

Robert Moffatt

Rafif E Hamam

Mehmet Bayindir

Hermann A Haus

Ayman F Abouraddy

Ori Weisberg

Leslie Kolodziejski

Evan J Reed

Peter Bermel

Elefterios Lidorikis

Edwin Lorimer Thomas

Gale Petrich

Maksim Skorobogatiy

Ivan Celanovic

Torkel Engeness

Alejandro W Rodriguez

Michelle L Povinelli

Shandon Dee Hart

Alexei A Erchak

Chiyan Luo

Erich P Ippen

Alexander Stolyarov

Bo Zhen

Guillaume Lestoquoy

Michael Ghebrebrhan

Alexander Gumennik

Ido Kaminer

Dursen Saygin Hinczewski

Jerimy R Arnold

Nicholas H Rivera

Adrian Y X Yeng

Lionel Cooper Kimerling

Brent Everett Little

Yichen Shen

Steven Alan Jacobs

Zheng Barton Wang

Chiping Chen

Karl D Brommer

Lori Pressman

Wesley A King

Emilia G Anderson

Yi Yang

Benjamin Jean-Baptiste Grena

Rokan Ahmad

Andrew Rappe

Kyeongjae Cho

Henry Mullaney

Kevin M Chen

Nicholas D Orf

Solomon Assefa

Jorge Bravo-Abad

Lei Wei

Sylvain Danto

Moungi G Bawendi

Michael Robert Watts

Michal Lipson

Klavs F Jensen

Zheng Wang

Keith Adam Nelson

Marko Loncar

Karl Kimon Berggren

Peter Thomas Rakich

Vikram C Sundar

Peter Bienstman

George B Kenney

Mordechai Segev

Burak Temelkuran

Lene Vestergaard Hau

Elliott R Brown

Christina Manolatou

Aimee Rose

Chia Wei Hsu

Charles Roques-Carmes

Garry Maskaly

Daniel J Ripin

Michael A Shapiro

Ognjen Ilic

Phillip Donald Keathley

Tena Dubcek

Jamison Sloan

Liang Jie Wong

Walker Chan

Steven E Kooi

Song-Liang Chua

Jeongwon Lee

Chong Hou

Yinan Zhang

A time varying laser which can operate by taking advantage of transitions between time varying quasi-energy levels which are present in the driven system is disclosed. This can allow for laser operation at frequencies which are new, compared to the operation of the laser in absence of time-modulation. It can also allow for a novel mode of operation in which the system provides gain at multiple frequencies simultaneously, in a coherent fashion which is fundamentally different from multi-mode behavior in conventional lasers. Additionally, in systems with sufficiently strong modulation, these principles can lead to lasers which produce gain even in the thermodynamic ground state of the system, leading to a new form of lasing without inversion (LWI). In addition, these techniques have the potential to be used to create lasers at high frequencies (UV-Xray) which have been difficult to achieve via conventional laser mechanisms.

Methods and apparatus for generating coherent light at new frequencies via time varying lasing

Disclosed is an apparatus for use in wireless energy transfer, which includes a first resonator structure configured to transfer energy non-radiatively with a second resonator structure over a distance greater than a characteristic size of the second resonator structure. The non-radiative energy transfer is mediated by a coupling of a resonant field evanescent tail of the first resonator structure and a resonant field evanescent tail of the second resonator structure.

Wireless energy transfer

Described herein are embodiments of a source high-Q resonator, optionally coupled to an energy source, a second high-Q resonator, optionally coupled to an energy drain that may be located a distance from the source resonator. A third high-Q resonator, optionally coupled to an energy drain that may be located a distance from the source resonator. The source resonator and at least one of the second resonator and third resonator may be coupled to transfer electromagnetic energy from said source resonator to said at least one of the second resonator and third resonator.

Wireless non-radiative energy transfer

A near-field ThermoPhotoVoltaic system comprises a hot emitter and a cold absorbing PhotoVoltaic cell separated by a small gap. The emitter emits hot photons and includes a polaritonic material that supports a surface-polaritonic mode. The PhotoVoltaic cell has a metallic back electrode and includes a semiconductor that absorbs the photons and supports guided photonic modes. The surface-polaritonic mode and the first guided photonic mode resonantly couple at a frequency slightly above the semiconductor bandgap. The system material and geometrical parameters are such that the surface-polaritonic mode and the first guided photonic mode are approximately impedance-matched, so that power is transmitted at frequencies just above the semiconductor bandgap, even for relatively large gap widths, while the power transmitted at other frequencies is relatively small, leading to high system efficiency. Also described the PhotoVoltaic cell's front electrode, which may include highly-doped semiconductor regions, thin conducting oxide or silver films, or graphene layers.

Highly-efficient near-field thermophotovoltaics using surface-polariton emitters and thin-film photovoltaic-cell absorbers

An apparatus includes at least one conductive layer, an electromagnetic (EM) wave source, and an electron source. The conductive layer has a thickness less than 5 nm. The electromagnetic (EM) wave source is in electromagnetic communication with the at least one conductive layer and transmits a first EM wave at a first wavelength in the at least one conductive layer so as to generate a surface plasmon polariton (SPP) field near a surface of the at least one conductive layer. The electron source propagates an electron beam at least partially in the SPP field so as to generate a second EM wave at a second wavelength less than the first wavelength.

Apparatus and methods for generating electromagnetic radiation

An apparatus for generating Smith-Purcell radiation having at least one spectral component at a wavelength &#x3bb; includes a periodic structure including a dielectric material and an electron source, in electromagnetic communication with the periodic structure, to emit an electron beam propagating within about 5&#x3bb; from a surface of the periodic structure to induce emission of the Smith-Purcell radiation. The electron beam has an electron energy tunable between about 0.5 keV and about 40 keV so as to change a wavelength of the Smith-Purcell radiation.

Apparatus and methods for generating and enhancing Smith-Purcell radiation

A fiber is provided that has been thermally drawn from a fiber preform, having a longitudinal-axis length and including at least one core that has a longitudinal core axis parallel to the longitudinal axis and internally disposed to at least one outer fiber cladding material layer along the fiber length. The fiber is fed through a localized heating site having a heating site temperature, T, that is above a melting temperature of the fiber core, with a feed speed, &#x3c5;, that melts a portion of the fiber core at the heating site, causing molten droplets to pinch off of fiber core material, one droplet at a time, with a time period of molten droplet formation set by the fiber feed speed, &#x3c5;. The fiber is fed through the localized heating site to move the molten droplets out of the heating site and solidify the molten droplets into solid in-fiber particles.

Dynamic in-fiber particle production with precise dimensional control

Ultra-thin conductors are employed to generate plasmon fields near the surface of the conductors. Emitters, such as atoms, molecules, quantum dots, or quantum wells, in the plasmon fields can emit and absorb light via transitions that are otherwise forbidden in the absence of the plasmon fields. Applications using these forbidden transitions include spectroscopy, organic light sources, and broadband light generation. For example, in a spectroscopic platform, an emitter is disposed in the plasmon fields to excite electronic transitions that are otherwise unexcitable. In organic light sources, plasmon fields quench excited triplet states, allowing fast singlet decay with the emission of light. In broadband light generation, strong two-plasmon spontaneous emission of emitters near ultrathin conductors is employed to produce a broad spectrum of light.

Apparatus and methods for spectroscopy and broadband light emission using two-dimensional plasmon fields

There is provided a sensor fiber including an electrically insulating material having a fiber length. At least one transduction element is disposed along at least a portion of the fiber length and is arranged for exposure to an intake species. A photoconducting element is in optical communication with the transduction element. At least one pair of electrically conducting electrodes are in electrical connection with the photoconducting element. The pair of electrodes extend the fiber length.

Fiber sensor

A transparent display includes nanoparticles having wavelength-selective scattering (e.g., resonant scattering) to preferentially scatter light at one or more discrete wavelengths so as to create images. The nanoparticles transmit light at other wavelengths to maintain a high transparency of the display. The nanoparticles are disposed in proximity to a thin film, which can enhance the scattering the process by reflecting light back to the nanoparticles for re-scattering or increasing the quality factor of the resonant scattering.

Transparent displays with scattering nanoparticles and thin films for enhanced scattering

The present invention provides systems, articles, and methods for discriminating electromagnetic radiation based upon the angle of incidence of the electromagnetic radiation. In some cases, the materials and systems described herein can be capable of inhibiting reflection of electromagnetic radiation (e.g., the materials and systems can be capable of transmitting and/or absorbing electromagnetic radiation) within a given range of angles of incidence at a first incident surface, while substantially reflecting electromagnetic radiation outside the range of angles of incidence at a second incident surface (which can be the same as or different from the first incident surface). A photonic material comprising a plurality of periodically occurring separate domains can be used, in some cases, to selectively transmit and/or selectively absorb one portion of incoming electromagnetic radiation while reflecting another portion of incoming electromagnetic radiation, based upon the angle of incidence. In some embodiments, one domain of the photonic material can include an isotropic dielectric function, while another domain of the photonic material can include an anisotropic dielectric function. In some instances, one domain of the photonic material can include an isotropic magnetic permeability, while another domain of the photonic material can include an anisotropic magnetic permeability. In some embodiments, non-photonic materials (e.g., materials with relatively large scale features) can be used to selectively absorb incoming electromagnetic radiation based on angle of incidence.

Discriminating electromagnetic radiation based on angle of incidence

Herein is provided a fiber that includes a cladding material disposed along a longitudinal-axis fiber length and a plurality of discrete and disconnected high-stress domains that are disposed as a sequence along a longitudinal line parallel to the longitudinal fiber axis in at least a portion of the fiber length. Each high stress domain has an internal pressure of at least 0.1 GPa and comprises a material that is interior to and different than the fiber cladding material.

High-pressure in-fiber particle production with precise dimensional control

Growing community of inventors

Belmont, MA, United States of America

John Dimitris Joannopoulos