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Towards an optical coupler using fine-wire: a study of the photovoltaic effect of a heterojunction formed in a single fine-wire of tungsten oxides |
| Chen Shang-Hui(陈尚辉), Chen Jian(陈建), Deng Shao-Zhi(邓少芝), and Xu Ning-Sheng(许宁生)† |
| State Key Laboratory of Optoelectronic Materials and Technologies, and Guangdong Province Key Laboratory for Display Material and Technology, School of Physics and Engineering, SunYat-Sen University, Guangzhou 510275, China |
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Abstract Nanodevices using the photovoltaic effect of a single nanowire have attracted growing interest. In this paper, we consider potential applications of the photovoltaic effect to optical signal coupling and optical power transmission, and report on the realization of a heterojunction formed between WO2 and WO3 in a fine-wire having a diameter on the micrometer scale. Using a laser beam of 514.5 nm as a signal source, the WO2--WO3 heterojunction yields a maximum output power of up to 37.4 pico watt per heterojunction. Fast responses (less than a second) of both photovoltaic voltage and current are also observed. In addition, we demonstrate that it is a simple and effective way to adapt a commercial Raman spectrometer for the combined functions of fabrication, material characterization and photovoltaic measurement of an optical signal coupler and optical power transmitter based on a fine-wire. Our results show an attractive perspective of developing nanowire or fine-wire elements for coupling optical signals into and for powering a nanoelectronic or nano-optoelectronic integrated circuit that works under the condition of preventing it from directly electrically connecting with the optical coupler.
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Received: 29 June 2009
Revised: 15 September 2009
Accepted manuscript online:
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PACS:
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42.82.Et
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(Waveguides, couplers, and arrays)
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72.40.+w
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(Photoconduction and photovoltaic effects)
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73.63.-b
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(Electronic transport in nanoscale materials and structures)
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42.79.Gn
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(Optical waveguides and couplers)
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85.35.-p
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(Nanoelectronic devices)
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42.79.Sz
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(Optical communication systems, multiplexers, and demultiplexers?)
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| Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos.~U0634002, 50725206
and 50672135), the National Basic Research Program of China (Grant
Nos.~2003CB314701, 2007CB935501 and 2008AA03A314), and the
Department of Information Industry of Guangdong Province, China. |
Cite this article:
Chen Shang-Hui(陈尚辉), Chen Jian(陈建), Deng Shao-Zhi(邓少芝), and Xu Ning-Sheng(许宁生) Towards an optical coupler using fine-wire: a study of the photovoltaic effect of a heterojunction formed in a single fine-wire of tungsten oxides 2010 Chin. Phys. B 19 037803
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