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Nanoelectronics


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#1 Lazarus Long

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Posted 21 January 2003 - 03:05 PM


I want to start branching Nanotech articles in to some general categories. Some distinctions that we can see developing for example are in the areas of Nanogenetics, Nanoelectronics, nanomaterials, and nanomedicine. Yet quite obviously these still overlap.

What follows for starters is an article from Nature on Nanoscale lasers and this will have important ramificatins in the construction of quantum computer hardware that uses optical information transfer as well as photon power for operations. I also think that closer study in this area will yield a crossover to nanomaterials in the form a amorphus semiconducter research for produce highly effecient inexpensive photovoltaic polymers that can be applied to surfaces throughout the world for producing lower cost electricity for common use.

Please add specific articles as you find them. Lets keep this one for nanoelectronics and diverge for other categorical applications.

#2 Lazarus Long

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Posted 21 January 2003 - 03:11 PM

Single-nanowire electrically driven lasers

Nature 421, 241 - 245 (2003); doi:10.1038/nature01353

XIANGFENG DUAN*†, YU HUANG*†, RITESH AGARWAL* & CHARLES M. LIEBER*‡

* Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
‡ Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA
† These authors contributed equally to this work


Correspondence and requests for materials should be addressed to C.M.L. (e-mail: cml@cmliris.harvard.edu).




Electrically driven semiconductor lasers are used in technologies ranging from telecommunications and information storage to medical diagnostics and therapeutics1. The success of this class of lasers is due in part to well-developed planar semiconductor growth and processing, which enables reproducible fabrication of integrated, electrically driven devices2, 3. Yet this approach to device fabrication is also costly and difficult to integrate directly with other technologies such as silicon microelectronics. To overcome these issues for future applications, there has been considerable interest in using organic molecules4, 5, polymers6, 7, and inorganic nanostructures8-10 for lasers, because these materials can be fashioned into devices by chemical processing. Indeed, amplified stimulated emission and lasing have been reported for optically pumped organic systems4-7 and, more recently, inorganic nanocrystals8, 9 and nanowires10. However, electrically driven lasing, which is required in most applications, has met with several difficulties in organic systems11, and has not been addressed for assembled nanocrystals or nanowires. Here we investigate the feasibility of achieving electrically driven lasing from individual nanowires. Optical and electrical measurements made on single-crystal cadmium sulphide nanowires show that these structures can function as Fabry–Perot optical cavities with mode spacing inversely related to the nanowire length. Investigations of optical and electrical pumping further indicate a threshold for lasing as characterized by optical modes with instrument-limited linewidths. Electrically driven nanowire lasers, which might be assembled in arrays capable of emitting a wide range of colours, could improve existing applications and suggest new opportunities.

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