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Surface-plasmon-assisted electromagnetic field enhancement in semiconductor quantum dots
KTH, School of Biotechnology (BIO), Theoretical Chemistry.ORCID iD: 0000-0002-2442-1809
KTH, School of Biotechnology (BIO), Theoretical Chemistry.
KTH, School of Biotechnology (BIO), Theoretical Chemistry.ORCID iD: 0000-0002-1763-9383
2007 (English)In: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 87, no 2, 167-169 p.Article in journal (Refereed) Published
Abstract [en]

The temporal development of incident electromagnetic plane waves across semiconductor quantum dots (QDs) is analyzed by the finite-difference time-domain method. By coating the QDs using thin metal films, surface plasmon polaritons (SPPs) can be created. As illustration, our modeling approach is applied to fluorescent multiphoton quantum dots made of cadmium sulphide of particular size (3.7 nm) and energy band gap (2.67 eV). When such a QD is coated by a metal film, a dipole-formed SPP is generated at the external surface of the coated QD by the incident electromagnetic wave with a photon energy of 1.34 eV corresponding to a two-photon process. When the thickness of the metal film is 0.37 nm, the peak intensity of the SPP oscillates through both the thin metal film and the core QD, resulting in an electromagnetic field inside the QD enhanced by a factor of 10, and thus an increased two-photon excitation that can be useful for bioimaging applications. Further increasing the metal film thickness blockades the SPP initially generated at the external surface of the coated QD from penetrating through the metal film, reducing the electromagnetic field inside the QD.

Place, publisher, year, edition, pages
2007. Vol. 87, no 2, 167-169 p.
Keyword [en]
Charged particles; Computer simulation; Electromagnetic fields; Electromagnetic waves; Surface plasmon resonance; Time domain analysis; Electromagnetic plane waves; Surface plasmon polaritons (SPP); Temporal development; Semiconductor quantum dots
National Category
Theoretical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-7501DOI: 10.1007/s00339-006-3838-zISI: 000249502400006Scopus ID: 2-s2.0-33947233980OAI: oai:DiVA.org:kth-7501DiVA: diva2:12546
Note
QC 20100825Available from: 2007-09-25 Created: 2007-09-25 Last updated: 2010-08-25Bibliographically approved
In thesis
1. Optical properties of active photonic materials
Open this publication in new window or tab >>Optical properties of active photonic materials
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Because of the generation of polaritons, which are quasiparticles possessing the characteristics of both photonics and electronics, active photonic materials offer a possible solution to transfer electromagnetic energy below the diffraction limit and further increase the density of photonic integrated circuits. A theoretical investigation of these exciting materials is, therefore, very important for practical applications.

Four different kinds of polaritons have been studied in this thesis, (1) surface polaritons of negative-index-material cylindric rods, (2) exciton polaritons of semiconductor quantum dots, (3) localized plasmon polaritons of metallic nanoshells, and (4) surface plasmon polaritons of subwavelength hole arrays in thin metal films. All these types of polaritons were found to strongly affect the optical properties of the studied active photonic materials. More specifically, (1) for two-dimensional photonic crystals composed of negative-index-material cylindric rods, the coupling among surface polaritons localized in the rods results in dispersionless anti-crossing bands; (2) for three-dimensional diamond-lattice quantum-dot photonic crystals, the exciton polariton resonances lead to the formation of complete band gaps in the dispersion relationships; (3) for metallic nanoshells, the thickness of the metal shell strongly modifies the localized plasmon polaritons, and therefore influences the degree of localization of the electromagnetic field inside the metallic nanoshells; (4) for subwavelength hole arrays in thin metal films, high-order surface-polariton Bloch waves contribute significantly to the efficient transmission.

To numerically simulate these active photonic materials, we introduced three approaches, (1) an extended plane-wave-based transfer-matrix approach for negative- index-material media, (2) a plane-wave method for semiconductor quantum-dot photonic crystals, and (3) an auxiliary-differential-equation finite-difference time- domain approach for semiconductor quantum-dot arrays. A brief perspective is also given at the end of this thesis.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 78 p.
Keyword
nanophotonics, plasmonics
National Category
Theoretical Chemistry
Identifiers
urn:nbn:se:kth:diva-4497 (URN)978-91-7178-763-7 (ISBN)
Public defence
2007-10-15, FA32, Main Building, AlbaNova, AlbaNova, 14:00
Opponent
Supervisors
Note
QC 20100825Available from: 2007-09-25 Created: 2007-09-25 Last updated: 2010-08-25Bibliographically approved

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