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Optical spectroscopy of single Si nanocylinders with magnetic and electric resonances.

Evlyukhin AB, Eriksen RL, Cheng W, Beermann J, Reinhardt C, Petrov A, Prorok S, Eich M, Chichkov BN, Bozhevolnyi SI - Sci Rep (2014)

Bottom Line: Multipole analysis of the experimental scattering spectra, based on the decomposed discrete dipole approximation, confirms resonant excitation of electric and magnetic dipole modes in the Si nanocylinders.Influences of light polarization and incident angle on the scattering properties of the nanocylinders are studied.The demonstrated properties of Si nanocylinders can be used for the realization of dielectric metasurfaces with different functional optical properties.

View Article: PubMed Central - PubMed

Affiliation: Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany.

ABSTRACT
Resonant electromagnetic properties of nanoparticles fabricated from high-index semiconductor or dielectric materials are very promising for the realization of novel nanoantennas and metamaterials. In this paper we study optical resonances of Si nanocylinders located on a silica substrate. Multipole analysis of the experimental scattering spectra, based on the decomposed discrete dipole approximation, confirms resonant excitation of electric and magnetic dipole modes in the Si nanocylinders. Influences of light polarization and incident angle on the scattering properties of the nanocylinders are studied. It is shown that the dependence of resonant excitation of the electric and magnetic modes in the nanocylinders on incident angle and polarization of light allows controlling and manipulating the scattered light in this system. The demonstrated properties of Si nanocylinders can be used for the realization of dielectric metasurfaces with different functional optical properties.

No MeSH data available.


Related in: MedlinePlus

Calculated spectra of total scattering cross-sections into the conical region with scattering angle 80 degrees (Fig. 3) of a Si nanocylinder irradiated by light waves of (a) TM polarization and (b) TE polarization. The nanocylinder diameter is equal to 100 nm.Other parameters are presented in Fig. 4. The scattering cross sections calculated separately for different multipole moments of nanocylinder are also presented: ED - electric dipole; MD - magnetic dipole; EQ - electric quadrupole; MQ - magnetic quadrupole.
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f5: Calculated spectra of total scattering cross-sections into the conical region with scattering angle 80 degrees (Fig. 3) of a Si nanocylinder irradiated by light waves of (a) TM polarization and (b) TE polarization. The nanocylinder diameter is equal to 100 nm.Other parameters are presented in Fig. 4. The scattering cross sections calculated separately for different multipole moments of nanocylinder are also presented: ED - electric dipole; MD - magnetic dipole; EQ - electric quadrupole; MQ - magnetic quadrupole.

Mentions: Scanning electron microscope (SEM) images of fabricated Si nanocylinders located on a silica substrate are shown in Fig. 1. The height of all nanocylinders is determined by the thickness of Si layer on a Soitec SOI wafer (Fig. 9a) and is equal to 220 nm. Their diameters vary in the range of 109 to 203 nm. In order to increase the contrast of SEM images, Si nanocylinders were covered by a thin gold layer after measurements of their optical spectra. Corresponding SEM images of the Si nanocylinders with the gold covering are shown in Fig. 1b. Dark-field images of the Si nanocylinders are presented in Fig. 1a. Different colors are produced by nanocylinders with different diameters indicating a strong dependence of scattering resonances on this parameter. Note that for nanocylinders with small diameters (109 nm and 143 nm) the dark-field images are homogeneous in color, whereas for the nanocylinder with diameter 203 nm the dark-field image has different colors. As it will be shown below, in the first case the dark-field images are determined by the resonantly excited dipole modes, in the second case the image is formed by several resonantly excited high-order modes at different wavelengths.


Optical spectroscopy of single Si nanocylinders with magnetic and electric resonances.

Evlyukhin AB, Eriksen RL, Cheng W, Beermann J, Reinhardt C, Petrov A, Prorok S, Eich M, Chichkov BN, Bozhevolnyi SI - Sci Rep (2014)

Calculated spectra of total scattering cross-sections into the conical region with scattering angle 80 degrees (Fig. 3) of a Si nanocylinder irradiated by light waves of (a) TM polarization and (b) TE polarization. The nanocylinder diameter is equal to 100 nm.Other parameters are presented in Fig. 4. The scattering cross sections calculated separately for different multipole moments of nanocylinder are also presented: ED - electric dipole; MD - magnetic dipole; EQ - electric quadrupole; MQ - magnetic quadrupole.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3927305&req=5

f5: Calculated spectra of total scattering cross-sections into the conical region with scattering angle 80 degrees (Fig. 3) of a Si nanocylinder irradiated by light waves of (a) TM polarization and (b) TE polarization. The nanocylinder diameter is equal to 100 nm.Other parameters are presented in Fig. 4. The scattering cross sections calculated separately for different multipole moments of nanocylinder are also presented: ED - electric dipole; MD - magnetic dipole; EQ - electric quadrupole; MQ - magnetic quadrupole.
Mentions: Scanning electron microscope (SEM) images of fabricated Si nanocylinders located on a silica substrate are shown in Fig. 1. The height of all nanocylinders is determined by the thickness of Si layer on a Soitec SOI wafer (Fig. 9a) and is equal to 220 nm. Their diameters vary in the range of 109 to 203 nm. In order to increase the contrast of SEM images, Si nanocylinders were covered by a thin gold layer after measurements of their optical spectra. Corresponding SEM images of the Si nanocylinders with the gold covering are shown in Fig. 1b. Dark-field images of the Si nanocylinders are presented in Fig. 1a. Different colors are produced by nanocylinders with different diameters indicating a strong dependence of scattering resonances on this parameter. Note that for nanocylinders with small diameters (109 nm and 143 nm) the dark-field images are homogeneous in color, whereas for the nanocylinder with diameter 203 nm the dark-field image has different colors. As it will be shown below, in the first case the dark-field images are determined by the resonantly excited dipole modes, in the second case the image is formed by several resonantly excited high-order modes at different wavelengths.

Bottom Line: Multipole analysis of the experimental scattering spectra, based on the decomposed discrete dipole approximation, confirms resonant excitation of electric and magnetic dipole modes in the Si nanocylinders.Influences of light polarization and incident angle on the scattering properties of the nanocylinders are studied.The demonstrated properties of Si nanocylinders can be used for the realization of dielectric metasurfaces with different functional optical properties.

View Article: PubMed Central - PubMed

Affiliation: Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany.

ABSTRACT
Resonant electromagnetic properties of nanoparticles fabricated from high-index semiconductor or dielectric materials are very promising for the realization of novel nanoantennas and metamaterials. In this paper we study optical resonances of Si nanocylinders located on a silica substrate. Multipole analysis of the experimental scattering spectra, based on the decomposed discrete dipole approximation, confirms resonant excitation of electric and magnetic dipole modes in the Si nanocylinders. Influences of light polarization and incident angle on the scattering properties of the nanocylinders are studied. It is shown that the dependence of resonant excitation of the electric and magnetic modes in the nanocylinders on incident angle and polarization of light allows controlling and manipulating the scattered light in this system. The demonstrated properties of Si nanocylinders can be used for the realization of dielectric metasurfaces with different functional optical properties.

No MeSH data available.


Related in: MedlinePlus