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Energy-momentum Spectroscopy: New Technique Could Improve Optical Devices

By Guest PostMarch 10, 2013Scienceangle, electronic excitations, energy momentum spectroscopy, grapheme, interference, jon schuller, keliang he, kymissis group, layered nanomaterials, leds, light absorbing devices, light emitting, molybdenum disulfide, mos2, new technique, optical devices, organic semiconductor, orientation of light, polarization, ptcda, rainbow colors, rashid zia, sinan karaveli, solar cells, source, theanne schiros, thin films, two dimensional material

Understanding the source and orientation of light in light-emitting thin films — now possible with energy-momentum spectroscopy — could lead to better LEDs, solar cells, and other devices that use layered nanomaterials.

PROVIDENCE, R.I. [Brown University] — A multi-university research team has used a new spectroscopic method to gain a key insight into how light is emitted from layered nanomaterials and other thin films.

The technique, called energy-momentum spectroscopy, enables researchers to look at the light emerging from a thin film and determine whether it is coming from emitters oriented along the plane of the film or from emitters oriented perpendicular to the film. Knowing the orientations of emitters could help engineers make better use of thin-film materials in optical devices like LEDs or solar cells. (more…)

Questions for Rashid Zia: Brown to Lead Multi-University Quantum Metamaterials Research

By Guest PostOctober 4, 2012Scienceair force, arto nurmikko, Diamond, electric dipole, encrypted communication, harry atwater, interaction, jelena vuckovic, kevin stacey, light, light wave, mark brongersma, matter, multidisciplinary, muri, nader engheta, nanometer, nicholas fang, office, optical memory, optical microprocessor, optical wavelength, quantum emitter, quantum metamaterials, quantum metaphotonics, quantum optics, quantum scale, rashid zia, research initiative, scalable technology, semiconductor, seth bank, shanhui fan, spatial variation, telecommunication, university, xiang zhang

Through a new Multidisciplinary University Research Initiative (MURI) awarded by the Air Force Office of Scientific Research, Brown will lead an effort to study new optical materials and their interactions with light at the quantum scale. The initiative, which includes six other top universities, will receive $4.5 million over three years, with a possible two-year extension.

Harnessing the power of light at the quantum scale could clear the way for superfast optical microprocessors, high-capacity optical memory, securely encrypted communication, and untold other technologies. But before any of these potential applications sees the light of day, substantial obstacles must be overcome — not the least of which is the fact that the wavelength of light is larger than quantum-scale objects, limiting the range of possible light-matter interactions. (more…)

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Energy-momentum Spectroscopy: New Technique Could Improve Optical Devices

Questions for Rashid Zia: Brown to Lead Multi-University Quantum Metamaterials Research