Resonant excitation and manipulation of complex interactions among two or more resonances in high-index dielectric nanostructures provide great opportunities for engineering novel optical phenomena and applications. However, difficulties often arise when interpreting the observed spectra because of the overlap of the broad resonances contributed by many factors such as particle size, shape, and background index. Therefore, selective excitation of resonances that spectrally overlap with each other provides a gateway towards an improved understanding of the complex interactions. Here, we demonstrate selective excitation and enhancement of multipolar resonances of silicon nanospheres using cylindrical vector beams (CVBs) with different diameters of nanospheres and numerical apertures (NAs) of the excitations. By combining single particle spectroscopy and electrodynamic simulations, we show that the radially polarized beam can selectively excite the electric multipoles, whereas the azimuthally polarized beam can selectively excite the magnetic multipoles even though multipolar resonances are convoluted together due to their spectral overlap. Moreover, focusing the CVBs with high NA can lead to a dominant longitudinal polarization of the electric or magnetic field. We show that the enhanced longitudinal polarization with increasing NA of the radially and azimuthally polarized beams can selectively enhance the electric and magnetic multipolar resonances, respectively. Our approach can be used as a spectroscopy tool to enhance and identify multipolar resonances leading to a better understanding of light-matter interactions in other dielectric nanostructures as well as serve as a first step toward excitation of dark mode and Fano resonances in dielectric oligomers by breaking the symmetry of the nanostructures.
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21 January 2020
Research Article|
January 15 2020
Selective excitation and enhancement of multipolar resonances in dielectric nanospheres using cylindrical vector beams
Uttam Manna
;
Uttam Manna
a)
1
Department of Physics, Illinois State University
, Normal, Illinois 61709, USA
a)Author to whom correspondence should be addressed: [email protected]
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Hiroshi Sugimoto
;
Hiroshi Sugimoto
2
Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University
, Rokkodai, Nada, Kobe 657-8501, Japan
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Daniel Eggena
;
Daniel Eggena
1
Department of Physics, Illinois State University
, Normal, Illinois 61709, USA
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Brighton Coe
;
Brighton Coe
1
Department of Physics, Illinois State University
, Normal, Illinois 61709, USA
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Ren Wang;
Ren Wang
3
Department of Electrical and Computer Engineering and Photonics Center, Boston University
, Boston, Massachusetts 02215, USA
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Mahua Biswas
;
Mahua Biswas
4
Department of Physics and Astronomy, Millikin University
, Decatur, Illinois 62522, USA
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Minoru Fujii
Minoru Fujii
2
Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University
, Rokkodai, Nada, Kobe 657-8501, Japan
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Uttam Manna
1,a)
Hiroshi Sugimoto
2
Daniel Eggena
1
Brighton Coe
1
Ren Wang
3
Mahua Biswas
4
Minoru Fujii
2
1
Department of Physics, Illinois State University
, Normal, Illinois 61709, USA
2
Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University
, Rokkodai, Nada, Kobe 657-8501, Japan
3
Department of Electrical and Computer Engineering and Photonics Center, Boston University
, Boston, Massachusetts 02215, USA
4
Department of Physics and Astronomy, Millikin University
, Decatur, Illinois 62522, USA
a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 127, 033101 (2020)
Article history
Received:
October 19 2019
Accepted:
December 20 2019
Citation
Uttam Manna, Hiroshi Sugimoto, Daniel Eggena, Brighton Coe, Ren Wang, Mahua Biswas, Minoru Fujii; Selective excitation and enhancement of multipolar resonances in dielectric nanospheres using cylindrical vector beams. J. Appl. Phys. 21 January 2020; 127 (3): 033101. https://doi.org/10.1063/1.5132791
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