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PI Physik Instrumente - Revolution In Photonics Align LW LB 3/24

Production of Gold Nanoantennas Made Highly Precise

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Washington, Jan. 3 , 2010 — Moving a step closer toward quantum computing, a research team in the Netherlands recently fabricated a photodetector based on a single nanowire, in which the active element is a single quantum dot with a volume of a mere 7000 cubic nanometers.


This image shows the photocurrent from the nanowire detector (the yellow spot represents the region where current is generated under illumination) and the electrical contacts are indicated in blue, while the nanowire is indicated in green. (Image: Zwiller)

Photodetectors based on single quantum dots are expected to find uses in optoelectrical interfaces in future quantum computers, where single photons will carry information over long distances and single electrons will be used for computation.

"Our research team fabricated a very localized light detector with dimensions far below the wavelength of light, which enables detection with very high spatial resolution," said Val Zwiller of the Kavli Institute of Nanoscience at Delft University of Technology.

"In addition, because quantum dots have discrete energy levels, only light in resonance with the energy levels of the quantum dot will be detected. The indium phosphide (InP) nanowire was grown with standard epitaxial techniques and the quantum dot was obtained by sandwiching a thin segment in between with a lower bandgap. We created the device using electron beam lithography to contact a single nanowire."

The device is described in the American Institute of Physics' journal Applied Physics Letters.

For more information, visit: aip.org



Rocky Mountain Instruments - Laser Optics MR

Published: January 2011
Glossary
indium phosphide
Indium phosphide (InP) is a compound semiconductor material composed of indium (In) and phosphorus (P). It belongs to the III-V group of semiconductors, where elements from groups III and V of the periodic table combine to form a variety of important semiconductor materials. Indium phosphide is known for its favorable electronic and optical properties, making it widely used in the fabrication of optoelectronic devices. Key features and properties of indium phosphide include: Bandgap: Indium...
nano
An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
photodetector
A photodetector, also known as a photosensor or photodiode, is a device that detects and converts light into an electrical signal. Photodetectors are widely used in various applications, ranging from simple light sensing to more complex tasks such as imaging and communication. Key features and principles of photodetectors include: Light sensing: The primary function of a photodetector is to sense or detect light. When photons (particles of light) strike the active area of the photodetector,...
7000 cubic nanometersAmericasCommunicationsDelft University of Technologyelectron beam lithographyEuropegold nanoantennasindium phosphideindustrialInP nanowireKavli Institute of NanoscienceLight Sourceslocalized light detectornanoOpticsoptoelectrical interfacephotodetectorphotonsquantum computingResearch & TechnologySensors & Detectorssingle nanowiresingle quantum dotthe NetherlandsVal ZwillerWashington D.C

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