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Title: Micro rectennas: Brownian ratchets for thermal-energy harvesting

We experimentally demonstrated the operation of a rectenna for harvesting thermal (blackbody) radiation and converting it into dc electric power. The device integrates an ultrafast rectifier, the self-switching nanodiode, with a wideband log-periodic spiral microantenna. The radiation from the thermal source drives the rectenna out of thermal equilibrium, permitting the rectification of the excess thermal fluctuations from the antenna. The power conversion efficiency increases with the source temperatures up to 0.02% at 973‚ÄČK. The low efficiency is attributed mainly to the impedance mismatch between antenna and rectifier, and partially to the large field of view of the antenna. Our device not only opens a potential solution for harvesting thermal energy but also provides a platform for experimenting with Brownian ratchets.
Authors:
; ;  [1] ;  [2]
  1. School of Engineering and Computing Sciences, Durham University, Durham DH1 3LE (United Kingdom)
  2. School of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL (United Kingdom)
Publication Date:
OSTI Identifier:
22395594
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BLACKBODY RADIATION; CONVERSION; EFFICIENCY; ELECTRIC POWER; FLUCTUATIONS; IMPEDANCE; MATHEMATICAL SOLUTIONS; PERIODICITY; RECTENNAS; RECTIFIERS; THERMAL EQUILIBRIUM