Effect of Multimodal Plasmon Resonances on the Optical Properties of Five-pointed Nanostars

Publisher:
InTech Open Access Publisher
Publication Type:
Journal Article
Citation:
Nanomaterials and Nanotechnology, 2015, 5 (1), pp. 1 - 7
Issue Date:
2015-01-01
Full metadata record
Files in This Item:
Filename Description Size
60726.pdfPublished Version4.03 MB
Adobe PDF
The optical transmission and electric field distribution of plasmonic nanostructures dictate their performance in nano-optics and nano-biosensors. Here, we consider the use of hollow, five-pointed, star-shaped nanostructures made of Al, Ag, Au or Cu. We use simulations based on finite-difference time-domain and the discrete dipole approximation to identify the strongest plasmon resonan‐ ces in these structures. In particular, we were seeking plasmon resonances within the visible part of the spec‐ trum. The silver pentagrams exhibited the strongest such resonance, at a wavelength of about 530 nm. The visiblelight resonances of Au and Cu pentagrams were relative‐ ly weaker and red-shifted by about 50 nm. The main resonances of the Al pentagrams were in the ultra-violet. All the nanostars also showed a broad, dipolar-like resonance at about 1000 nm. Surprisingly, the maximum field intensities for the visible light modes were greatest along the flanks of the stars ratherthan at theirtips, whereas those of the dipolar-like modes in the near-infrared were greatest at the tips of the star. These findings have practical implications for sensor design. The inclusion of a confor‐ mally hollow interior is beneficial because it provides additional ‘hot spots’.
Please use this identifier to cite or link to this item: