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Light propagation in nanorod arrays
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2007 (English)In: Journal of optics. A: Pure and applied optics, ISSN 1464-4258 (print) 1741-3567 (0nline), Vol. 9, no 3, 265-270 p.Article in journal (Refereed) Published
Abstract [en]

We study the propagation of TM- and TE-polarized light in two-dimensional arrays of silver nanorods of various diameters in a gelatin background. We calculate the transmittance, reflectance and absorption of arranged and disordered nanorod arrays and compare the exact numerical results with the predictions of the Maxwell–Garnett effective-medium theory. We show that interactions between nanorods, multipole contributions and formations of photonic gaps affect strongly the transmittance spectra that cannot be accounted for in terms of the conventional effective-medium theory. We also demonstrate and explain the degradation of the transmittance in arrays with randomly located rods as well as the weak influence of their fluctuating diameter. For TM modes we outline the importance of the skin effect, which causes the full reflection of the incoming light. We then illustrate the possibility of using periodic arrays of nanorods as high-quality polarizers.

Place, publisher, year, edition, pages
2007. Vol. 9, no 3, 265-270 p.
Keyword [en]
nanorods, particle plasmons, Maxwell–Garnett theory, Green's function technique
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-14620DOI: 10.1088/1464-4258/9/3/010OAI: diva2:24021
Available from: 2007-08-30 Created: 2007-08-30 Last updated: 2009-05-12
In thesis
1. Theoretical studies of light propagation in photonic and plasmonic devices
Open this publication in new window or tab >>Theoretical studies of light propagation in photonic and plasmonic devices
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Photonics nowadays is one of the most rapidly developing areas of modern physics. Photonic chips are considered to be promising candidates for a new generation of high-performance systems for informational technology, as the photonic devices provide much higher information capacity in comparison to conventional electronics. They also offer the possibility of integration with electronic components to provide increased functionality. Photonics has also found numerous applications in various fields including signal processing, computing, sensing, printing, and others.

Photonics, which traditionally covers lasing cavities, waveguides, and photonic crystals, is now expanding to new research directions such as plasmonics and nanophotonics. Plasmonic structures, namely nanoparticles, metallic and dielectric waveguides and gratings, possess unprecedented potential to guide and manipulate light at nanoscale.

This Thesis presents the results of theoretical studies of light propagation in photonic and plasmonic structures, namely lasing disk microcavities, photonic crystals, metallic gratings and nanoparticle arrays. A special emphasis has been made on development of high-performance techniques for studies of photonic devices.

The following papers are included:

In the first two papers (Paper I and Paper II) we developed a novel scattering matrix technique for calculation of resonant states in 2D disk microcavities with the imperfect surface or/and inhomogeneous refraction index. The results demonstrate that the surface imperfections represent the crucial factor determining the $Q$ factor of the cavity.

A generalization of the scattering-matrix technique to the quantum-mecha\-nical electron scattering has been made in Paper III. This has allowed us to treat a realistic potential of quantum-corrals (which can be considered as nanoscale analogues of optical cavities) and has provided a new insight and interpretation of the experimental observations.

Papers IV and V present a novel effective Green's function technique for studying light propagation in photonic crystals. Using this technique we have analyzed surface modes and proposed several novel surface-state-based devices for lasing/sensing, waveguiding and light feeding applications.

In Paper VI the propagation of light in nanorod arrays has been studied. We have demonstrated that the simple Maxwell Garnett effective-medium theory cannot properly describe the coupling and clustering effects of nanorods. We have demonstrated the possibility of using nanorod arrays as high-quality polarizers.

In Paper VII we modeled the plasmon-enhanced absorption in polymeric solar cells. In order to excite a plasmon we utilized a grated aluminum substrate. The increased absorption has been verified experimentally and good agreement with our theoretical data has been achieved.

Place, publisher, year, edition, pages
Universitetsbibliotek, 2007. 68 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1115
microcavities, photonic crystals, plasmonics, nanoparticles, scattering matrix technique, Green's function technique
National Category
urn:nbn:se:liu:diva-9585 (URN)978-91-85831-45-6 (ISBN)
Public defence
2007-08-30, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 00:00 (English)
Available from: 2007-08-30 Created: 2007-08-30 Last updated: 2009-05-12

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