Lighting Design & Specification

 Photon EmissionThis is an artist's representation of light trapped between a silver nanocube and a thin sheet of gold. When fluorescent molecules — shown in red — are trapped between the two, they emit photons up to 1,000 times faster than normal. Credit: Gleb Akselrod, Duke University

Researchers at Duke University have developed a new method to make fluorescent molecules emit photons at rate 1,000 times faster than normal, paving the way for quantum cryptography and superfast LEDs to be developed.

Currently, switching on and off LEDs is a slow process and hence the implementation of LEDs as a source for light-based telecommunications has been limited.

Photo:  This is an artist's representation of light trapped between a silver nanocube and a thin sheet of gold. When fluorescent molecules — shown in red — are trapped between the two, they emit photons up to 1,000 times faster than normal. Credit: Gleb Akselrod, Duke University

Duke University engineers have improved a fluorescent molecule’s photon emission rate by placing it in a gap between a thin sheet of gold and metal nanocubes. Ultrafast LEDs are one of the applications targeted by the researchers.

The research team led by Maiken Mikkelsen fabricated 75 nanometre silver nanocubes and increased the intensity of light by trapping it between the nanocubes.

The group made use of the Purcell enhancement effect, by which the photon emission rate of fluorescent molecules can be increased by placing them near intensified light.

The researchers adjusted the resonant frequency of the gap between the gold film and nanocubes in order to find a colour of light to which the molecules were responsive.

Using computer simulations, the scientists determined the precise size of the gap required between the gold film and the nanocubes for optimized configuration. The determined gap size was 20 atoms wide.

Since many randomly aligned molecules were used in the experiment, the group hopes that the performance can be further improved. The team is aiming to design a system consisting of precisely placed individual fluorescent molecules beneath a single nanocube.

Higher fluorescence rates can be achieved by placing the fluorescent molecules on edge at the corners of the nanocube.

The study findings have been published in the journal Nature Photonics http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2014.228.html.

 

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University of Toronto Engineering graduate Samah El-Tantawy is creating better, smarter traffic lights using game theory and artificial intelligence to teach lights how to adjust to traffic patterns in real time, reports Sharon Oosthoek in U of T News...      

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IES

 

The American Medical Association (AMA) Council on Science and Public Health (CSAPH) has issued two reports related to nighttime lighting since 2012. The 2012 AMA Report CSAPH 4-A-12 report, Light Pollution: Adverse Effects of Nighttime Lighting, resulted in AMA Policy H-135.932, noting in particular the “need for further multidisciplinary research of occupational and environmental exposure to light-at-night”, the recognition of how interior lighting and the use of electronic media affect sleep disruption especially in children and adolescents, and the need for work environments operating in 24/7 fashion to have employee fatigue risk management plans in place. The IES supports the 2012 AMA Policy H-135.932. Read more: IES Report. . . 

 

Lighting Design & Specification

This special semi-monthly newsletter has the broadest reach of those that are involved in all aspects of the electrical lighting design and specification industry across Canada. LDS is designed to provide lighting professionals insight and intelligence on those developments in the industry that effect design and specification. From corporate news to new technologies, products and insightful opinions, LDS will become your first read in the lighting industry in Canada. Published bi-monthly on Thursdays.
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