Backward scattering effect of aligned carbon nanotube arrays

Pengfei Wu; Zhifeng Ren; Michael R. Wang

doi:10.1117/12.810502

16 February 2009 Backward scattering effect of aligned carbon nanotube arrays

Pengfei Wu, Zhifeng Ren, Michael R. Wang

Proceedings Volume 7223, Photonic and Phononic Crystal Materials and Devices IX; 72231A (2009) https://doi.org/10.1117/12.810502
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

In terms of operational bandwidth and speed, photonic components are superior to electronic ones. However, it is difficult to control photons on nanoscale structures for data processing and interconnection. Nanophotonic device using surface plasmon (SP) offers an ideal solution to combine the superior technical advantages of both photonics and electronics on the same chip. The SP wavelength is much shorter than that of the exciting light, allowing the use of SP in various techniques that overcome diffraction limits. In this paper, we report an interesting plasmonic effect, enhanced backward scattering, by using a periodically-aligned carbon nanotube (CNT) array. The CNTs are grown on a transparent glass substrate with an average diameter of 50 nm and a length of about 1 μm. To enhance the conductivity, the CNTs are also coated with 10-nm Au layer by using E-beam CVD technique. By shining a laser beam to the CNT array, we found that the scattering intensity is maximally enhanced at the backward incident direction. The enhanced backward incident scattering is observed by using both periodic and nonperiodic CNT samples. The experimental results suggest that the backward scattering effect is due to the SP excitation and coupling. The proposed technique exploiting aligned carbon-nanotube arrays to manipulate surface plasmon will lead to useful optical features such as optical antennae effects, retro-reflection, switching, wavelength add/drop multiplexing, and may be particularly useful for optical sensing, smart target identification and optical wireless secure communication applications.

Citation Download Citation

Pengfei Wu, Zhifeng Ren, and Michael R. Wang "Backward scattering effect of aligned carbon nanotube arrays", Proc. SPIE 7223, Photonic and Phononic Crystal Materials and Devices IX, 72231A (16 February 2009); https://doi.org/10.1117/12.810502

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KEYWORDS

Scattering

Surface plasmons

Laser scattering

Light scattering

Gold

Carbon nanotubes

Metals

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