Plasmon coupling between complex gold nanostructures and a dielectric substrate

Name: Plasmon coupling between complex gold nanostructures and a dielectric substrate
Author: Fathi, Zahra Rostampour, Mengüç, Mustafa Pınar, Ertürk, H.

İsim	Plasmon coupling between complex gold nanostructures and a dielectric substrate
Yazar	Fathi, Zahra Rostampour, Mengüç, Mustafa Pınar, Ertürk, H.
Basım Tarihi:	2018-10-20
Basım Yeri	- The Optical Society
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	1559-128X
Kayıt Numarası	668de1a8-1c7e-4e4c-a03e-ed2106fd7a4e
Lokasyon	Mechanical Engineering
Tarih	2018-10-20
Notlar	Center for Energy, Environment and Economy at Ozyeoin University
Örnek Metin	Intercoupling of an incident electric field in metal nanoparticles causes asymmetric distribution of surface charges, which eventuates in shifting of the surface plasmon resonance frequency. This feature can be used in tuning the surface plasmon resonance and controlling the light absorption in a desired wavelength. This work provides a theoretical study of the plasmonic properties of complex gold nanostructures on a dielectric substrate where the nanoparticles have different morphologies. For analysis, we have developed a discrete dipole approximation with surface interactions-z, which is the third version of the MATLAB-based DDA-SI toolbox. In this version, lower-upper decomposition of the interaction matrix is used as a preconditioning of the LSQR iterative solver. This method accelerates the DDA-SI calculations by decreasing the total number of iteration steps and decreases the relative residual to achieve more accurate results. In the analysis, nanostructures are assumed to be gold dimers, trimers, and quadrumers with different sizes and elongations of cubical or spherical geometries on a BK7 substrate. The results show that absorption spectra exhibit both red- and blueshifted plasmon resonances in array, depending on the particle shape and elongation. The cubic structure of gold array provides the highest absorption efficiency, while the spherical structures give wider bandwidth; the combination of these structures could be used to design a system with intended features. We demonstrate that the geometrical symmetry plays an important role in the plasmon resonance of gold arrays, and it is shifted when the symmetry of the array is broken.
DOI	10.1364/AO.57.008954
Cilt	57

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Plasmon coupling between complex gold nanostructures and a dielectric substrate

Yazar Fathi, Zahra Rostampour, Mengüç, Mustafa Pınar, Ertürk, H.

Basım Tarihi 2018-10-20

Basım Yeri - The Optical Society

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 1559-128X

Kayıt Numarası 668de1a8-1c7e-4e4c-a03e-ed2106fd7a4e

Lokasyon Mechanical Engineering

Tarih 2018-10-20

Notlar Center for Energy, Environment and Economy at Ozyeoin University

Örnek Metin Intercoupling of an incident electric field in metal nanoparticles causes asymmetric distribution of surface charges, which eventuates in shifting of the surface plasmon resonance frequency. This feature can be used in tuning the surface plasmon resonance and controlling the light absorption in a desired wavelength. This work provides a theoretical study of the plasmonic properties of complex gold nanostructures on a dielectric substrate where the nanoparticles have different morphologies. For analysis, we have developed a discrete dipole approximation with surface interactions-z, which is the third version of the MATLAB-based DDA-SI toolbox. In this version, lower-upper decomposition of the interaction matrix is used as a preconditioning of the LSQR iterative solver. This method accelerates the DDA-SI calculations by decreasing the total number of iteration steps and decreases the relative residual to achieve more accurate results. In the analysis, nanostructures are assumed to be gold dimers, trimers, and quadrumers with different sizes and elongations of cubical or spherical geometries on a BK7 substrate. The results show that absorption spectra exhibit both red- and blueshifted plasmon resonances in array, depending on the particle shape and elongation. The cubic structure of gold array provides the highest absorption efficiency, while the spherical structures give wider bandwidth; the combination of these structures could be used to design a system with intended features. We demonstrate that the geometrical symmetry plays an important role in the plasmon resonance of gold arrays, and it is shifted when the symmetry of the array is broken.

DOI 10.1364/AO.57.008954

Cilt 57