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Electromagnetic excitation of nano-carbon in vacuum

Shaomin Wang, Laigui Hu, Binzhi Zhang, Daomu Zhao, Zhiyi Wei, and Zhiguo Zhang

Open Access Open Access

Abstract

Nano-carbon as lighting source is demonstrated in this paper. The characterized nano-radiation from nano-carbon, excited by different lasers in vacuum, is observed when laser intensity is over a threshold. With lower excitation threshold and smaller white light source, nano-carbon is more applicable to be as lighting system than the others in scientific experiments. White light emission of nano-carbon induced by more practicable electromagnetic excitation (microwave) is also demonstrated, which is caused by the faradic heating of the metal substrates, with molecular spectra and better color rendering. Lighting systems comprised of nano-carbon may become one of the considerable directions in optics.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Demonstration of the laser-induced characterized nano-radiation from nano-carbon covering the vanes of the Crookes radiometer. (a) The magnification of the pane in Fig. 1(b). (b) One vane of the radiometer is illuminated on the blackened side by a focused red (λ=655 nm) LD beam. (c) Spectra of the white light emission induced by two different LDs with 806-nm wavelength (250-mW power, red line) and 655-nm wavelength (35-mW power, green line). (d) TEM picture of the nano-carbon particles.

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Fig. 2.
Fig. 2. (a) Spectra of laser-induced radiation from carbon nanoparticles (red line) and theoretical simulation of blackbody radiation (blue line), radiation from a carbon nano-particle (green line) at temperature 3800 K. (b) Similar phenomenon is still observed in the modified radiometer by us.

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Fig. 3.
Fig. 3. Features of the characterized nano-radiation. (a) Comparison of spectra between the nano-radiation of nano-carbon (red line) and normal LED (green line). (b) Oscillograph trace of emission delay and (c) emission decay in the time resolved experiments (recorded by a photomultiplier and HAMEG 30 MHz Analog/Digital Scope HM 305).

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Fig. 4.
Fig. 4. Demonstration of the microwave-induced white light emission. (a) Photograph of this emission from the radiometer. (b) Photograph of the sun under the same exposure condition for comparison. (c) Spectrum of the microwave-induced emission. (d) Spectrum of the sun light.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

Φ λ ( r , T ) = 4 π r 2 Q abs ( r , λ ) P λ ( T ) ,
Q abs ( r , λ ) = 8 π r λ Im [ m 2 − 1 m 2 + 2 ] .
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