Massachusetts Institute of Technology

Jonathan R Tischler

Vladimir Bulovic

Michael Scott Bradley

Moungi G Bawendi

Jennifer J Yu

Jonathan E Halpert

William Alfred Tisdale

Gleb M Akselrod

Brian J Walker

Ioannis Kymissis

Daniel G Nocera

David Oertel

Elizabeth R Young

A composition can include a first moiety capable of being excited to an excited state, and a second moiety capable of accepting excited state energy from the first moiety. The second moiety is capable of emitting light with a FWHM of 15 nm or less when excited. The second moiety can be a J-aggregate and the first moiety can be a semiconductor nanocrystal.

Light emitting material

Disclosed are a device and a method for the design and fabrication of the device for enhancing the brightness of luminescent molecules, nanostructures, and thin films. The device includes a mirror, a dielectric medium or spacer, an absorptive layer, and a luminescent layer. The absorptive layer is a continuous thin film of a strongly absorbing organic or inorganic material. The luminescent layer may be a continuous luminescent thin film or an arrangement of isolated luminescent species, e.g., organic or metal-organic dye molecules, semiconductor quantum dots, or other semiconductor nanostructures, supported on top of the absorptive layer.

Device and method for luminescence enhancement by resonant energy transfer from an absorptive thin film

Materials can be prepared in a layer-by-layer fashion on a patterned first substrate and subsequently transferred to a second substrate. The transfer step can preserve the pattern of the first substrate, such that the second substrate will bear a pattern of the transferred material. The material can be an electrostatic multilayer including a light absorbing dye, such as a J-aggregating cyanine dye.

Absorbing film

The disclosed device is a solid state organic semiconductor VCSEL in which the microcavity is composed of metal and dielectric mirrors and the gain layer is only &#x3bb;/2n thick. The gain layer comprises a thermally evaporated 156.7 nm thick film of the laser dye DCM doped (2.5% v/v) into an Alqhost matrix. The microcavity consists of 2 mirrors, a dielectric Bragg reflector (DBR) sputter-coated onto a quartz substrate as the mirror through which the organic gain layer is optically excited and laser emission is collected and a silver mirror that is thermally evaporated on top of the Alq:DCM film. The device exhibits laser action from the DCM both when the DCM molecules are excited directly at 535 nm and via F&#xf6;rster Resonance Energy Transfer (FRET) from the Alq(excited at 404 nm) with laser thresholds of 4.9 &#x3bc;J/cmand 14.2 &#x3bc;J/cmrespectively.

Method and apparatus for super radiant laser action in half wavelength thick organic semiconductor microcavities

An optical fiber including a surface including a non-covalent multilayer including a light-absorbing material can be used to develop fluorescence microscopy with a lateral resolution of about 5 nm and possibly lower. The non-covalent multilayer can be a highly absorptive thin film, for example a film based on J-aggregates, which can be used with conventional Near-Field Scanning Optical Microscopy.

High resolution near field scanning optical microscopy

An optical structure can include a nanocrystal on a surface of an optical waveguide in a manner to couple the nanocrystal to the optical field of light propagating through the optical waveguide to generate an emission from the nanocrystal.

Optical structures including nanocrystals

A critically coupled optical resonator absorbs greater than 95% of incident light of the critical wavelength with an absorber layer less than 10 nm thick.

Light-absorbing structure and methods of making

Embodiments of the present invention provide for an array, and corresponding method of forming an array, that includes a plurality of light emitting devices. The light emitting devices are disposed over a substrate, and a photodetector detects light emitted through the substrate from the light emitting devices. Further, a substantially constant brightness may be maintained in a plurality of light emitting devices disposed over the upper surface of a substrate in an array. Light emitted through the substrate from each of the light emitting devices is measured, and the voltage level applied to each of the light emitting devices is varied to maintain a substantially constant brightness level of light emitted from the light emitting devices.

LED array with photodetector

A high oscillator strength thin film has an absorption constant greater than or equal to 10cm.

A light emitting device includes an optical cavity in resonance with an optical transition of a material disposed in the cavity. The device can form an exciton-polariton state.

Growing community of inventors

Cambridge, MA, United States of America

Jonathan R Tischler