Yoel M Fink, 5860 Wadsworth St, Cambridge, MA 02142

6433931, Aug 13, 2002

Jan 10, 2000

09/367332

Yoel Fink - Cambridge MA
Edwin L. Thomas - Natick MA

Massachusetts Institute of Technology - Cambridge MA

G02B 110

359586, 359589, 359241

A polymeric photonic band gap structure can be defined by a block copolymeric species, a mixture of homopolymers, or a combination optionally with appropriate dielectric contrast enhancing additives. The structure includes periodic, phase-separated microdomains alternating in refractive index, the domains sized to provide a photonic band gap in the UV-visible spectrum. A method of the invention involves creating a defect in a polymeric article including a periodic structure of a plurality occuring separate domains. The defect can be created by inserting into the material a plane of a material different from materials defining the polymeric article. According to another method of the invention, a defect is created in a polymeric article, including a periodic structure of a plurality of periodically occuring separate domains, by altering polymeric material in the article. The polymeric material can be altered by removing polymeric material via radiation, by exposing the material to intersecting beams of radiation, by removing the material via etching or the like. A defect can be created in one embodiment by magnetically guiding a defined by a block copolymeric species, a mixture of homopolymers, or a combination optionally with appropriate dielectric contrast enhancing additives.

6463200, Oct 8, 2002

Oct 14, 1999

09/418344

Yoel Fink - Cambridge MA
Shanhui Fan - Somerville MA
Edwin Thomas - Natick MA
Chiping Chen - Needham MA
John Joannopoulos - Belmont MA

Massachusetts Institute of Technology - Cambridge MA

G02B 616

385123, 385126

A device having at least one dielectric inner core region in which electromagnetic radiation is confined, and at least two dielectric outer regions surrounding the inner core region, each with a distinct refractive index. The outer regions confine electromagnetic radiation within the inner core region. The refractive indices, the number of outer regions, and thickness of the outer regions result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0Â to at least 80Â for all polarizations for a range of wavelengths of the electromagnetic radiation. In exemplary embodiments, the inner core region is made of a low dielectric material, and the outer regions include alternating layers of low and high dielectric materials. In one aspect of the invention, the device is a waveguide, and in another aspect the device is a microcavity.

6563981, May 13, 2003

Jan 31, 2002

10/066234

Ori Weisberg - Cambridge MA
Steven G. Johnson - Cambridge MA
Michael Shapiro - Marblehead MA
Yoel Fink - Cambridge MA
Mihai Ibanescu - Cambridge MA

Omniguide Communications - Cambridge MA

G02B 642

385 28, 385126, 385127

A method for converting electromagnetic (EM) energy between guided modes of a photonic crystal waveguide having a waveguide axis, the method including: (i) providing the photonic crystal waveguide with a mode coupling segment comprising at least one bend in the waveguide axis, wherein during operation the mode coupling segment converts EM. energy in a first guided mode to a second guided mode; (ii) providing EM energy in the first guided mode of the photonic crystal waveguide; and (iii) allowing the EM energy in the first guided mode to encounter the mode coupling segment to convert at least some of the EM energy in the first guided mode to EM energy in the second guided mode.

6573813, Jun 3, 2003

Apr 19, 2000

09/551908

John D. Joannopoulos - Belmont MA
Yoel Fink - Cambridge MA
Mihai Ibanescu - Cambridge MA
Edwin Thomas - Natick MA

Massachusetts Institute of Technology - Cambridge MA

H01P 318

333342, 333249

An all-dielectric coaxial waveguide comprising a dielectric core region; an annulus of dielectric material, surrounding the core region, in which electromagnetic radiation is confined; and an outer region of cylindrically coaxial dielectric shells of alternating indices of refraction surrounding the annulus. The core region and the outer region have an average index of refraction which is higher than the index of refraction of the annulus.

6603911, Aug 5, 2003

Aug 1, 2002

10/210493

Yoel Fink - Cambridge MA
Shanhui Fan - Somerville MA
Edwin Thomas - Natick MA
Chiping Chen - Needham MA
John Joannopoulos - Belmont MA

Massachusetts Institute of Technology - Cambridge MA

G02B 616

385123, 385126

A device having at least one dielectric inner core region in which electromagnetic radiation is confined, and at least two dielectric outer regions surrounding the inner core region, each with a distinct refractive index. The outer regions confine electromagnetic radiation within the inner core region. The refractive indices, the number of outer regions, and thickness of the outer regions result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0Â to at least 80Â for all polarizations for a range of wavelengths of the electromagnetic radiation. In exemplary embodiments, the inner core region is made of a low dielectric material, and the outer regions include alternating layers of low and high dielectric materials. In one aspect of the invention, the device is a waveguide, and in another aspect the device is a microcavity.

6625364, Sep 23, 2003

Jan 25, 2002

10/057258

Steven G. Johnson - Cambridge MA
Mihai Ibanescu - Cambridge MA
Ori Weisberg - Cambridge MA
Yoel Fink - Cambridge MA
John D. Joannopoulos - Belmont MA
Torkel Engeness - Somerville MA
Marin Soljacic - Somerville MA
Steven A. Jacobs - Needham MA

OmniGuide Communications - Cambridge MA

G02B 622

385127

An optical waveguide including: a dielectric core region extending along a waveguide axis; and a dielectric confinement region surrounding the core about the waveguide axis, the confinement region comprising a photonic crystal structure having a photonic band gap, wherein during operation the confinement region guides EM radiation in at least a first range of frequencies to propagate along the waveguide axis, wherein the core has an average refractive index smaller than about 1. 3 for a frequency in the first range of frequencies, and wherein the core a diameter in a range between about 4 and 80 , wherein is a wavelength corresponding to a central frequency in the first frequency range.

6671097, Dec 30, 2003

May 16, 2002

10/146775

Yoel Fink - Cambridge MA
Edwin L. Thomas - Natick MA

Massachusetts Institute of Technology - Cambridge MA

G02B 110

359586, 359589, 359241

A polymeric photonic band gap structure can be defined by a block copolymeric species, a mixture of homopolymers, or a combination optionally with appropriate dielectric contrast enhancing additives. The structure includes periodic, phase-separated microdomains alternating in refractive index, the domains sized to provide a photonic band gap in the UV-visible spectrum.

6716475, Apr 6, 2004

Mar 16, 2000

09/527579

Yoel Fink - Cambridge MA
John D. Joannopoulos - Belmont MA
Edwin L. Thomas - Natick MA

Massachusetts Institute of Technology - Cambridge MA

A23G 300

426660, 426250, 117 65, 205 79, 205305

A materials system or dielectric structure, for example a photonic crystal, of the invention includes a plurality of materials that are biocompatible. The materials have different indices of refraction for the wavelength of operation and are assembled into a dielectric structure having a photonic band gap in one or more directions. The assembly process yields a structure with a particular spatial arrangement of materials with different indices of refraction which is completely biocompatible and has the property of reflecting light at a particular predetermined range of frequencies, as well as other properties associated with photonic band gaps. These structures can exhibit photonic band gaps that can be engineered to be broad or narrow and be centered on different parts of the spectrum UV, visible IR or longer wavelengths. The materials used can have microwave transparency or be made to reflect microwaves. Possible applications include edible reflectors for visible to impart a particular color to the food or specular appearance, heat shields to minimize radiative and evaporative and convective heat losses, and as a UV protection layer.