scholarly journals Disorder induced rotational-symmetry breaking to control directionality of whispering gallery modes in circularly symmetric nanowire assembly

2019 ◽  
Vol 27 (16) ◽  
pp. 23645
Author(s):  
Dip Joti Paul ◽  
Sushmit Hossain ◽  
Md Zunaid Baten
Keyword(s):  
Symmetry Breaking ◽  
Rotational Symmetry ◽  
Whispering Gallery Modes ◽  
Whispering Gallery

scholarly journals Whispering Bloch modes

2016 ◽  
Vol 472 (2191) ◽  
pp. 20160103 ◽  
Author(s):  
B. Maling ◽  
R. V. Craster
Keyword(s):  
Helmholtz Equation ◽  
Eigenvalue Problems ◽  
Open Systems ◽  
Rotational Symmetry ◽  
Field Enhancement ◽  
High Order ◽  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Field Patterns ◽  
Bloch Modes

We investigate eigenvalue problems for the planar Helmholtz equation in open systems with a high order of rotational symmetry. The resulting solutions have similarities with the whispering gallery modes exploited in photonic micro-resonators and elsewhere, but unlike these do not necessarily require a surrounding material boundary, with confinement instead resulting from the geometry of a series of inclusions arranged in a ring. The corresponding fields exhibit angular quasi-periodicity reminiscent of Bloch waves, and hence we refer to them as whispering Bloch modes (WBMs). We show that if the geometry of the system is slightly perturbed such that the rotational symmetry is broken, modes with asymmetric field patterns can be observed, resulting in field enhancement and other potentially desirable effects. We investigate the WBMs of two specific geometries first using expansion methods and then by applying a two-scale asymptotic scheme.

Control of Whispering Gallery Modes and PT-Symmetry Breaking in Colloidal Quantum Dot Microdisk Lasers with Engineered Notches

Nano Letters ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 6049-6057 ◽  
Author(s):  
Qingji Zeng ◽  
Evan Lafalce ◽  
Chun Hao Lin ◽  
Marcus J. Smith ◽  
Jaehan Jung ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Symmetry Breaking ◽  
Pt Symmetry ◽  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Microdisk Lasers ◽  
Colloidal Quantum Dot

scholarly journals Probing higher order optical modes in all-dielectric nanodisk, -square, and -triangle by aperture type scanning near-field optical microscopy

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Aleksandr Yu. Frolov ◽  
Joris Van de Vondel ◽  
Vladimir I. Panov ◽  
Pol Van Dorpe ◽  
Andrey A. Fedyanin ◽  
...  
Keyword(s):  
Rotational Symmetry ◽  
Near Field ◽  
Optical Cavity ◽  
Building Blocks ◽  
Optical Microscope ◽  
Higher Order ◽  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Cavity Modes ◽  
Wide Range

Abstract All-dielectric nanoantennas, consisting of high refractive index semiconductor material, are drawing a great deal of attention in nanophotonics. Owing to their ability to manipulate efficiently the flow of light within sub-wavelength volumes, they have become the building blocks of a wide range of new photonic metamaterials and devices. The interaction of the antenna with light is largely governed by its size, geometry, and the symmetry of the multitude of optical cavity modes it supports. Already for simple antenna shapes, unraveling the full modal spectrum using conventional far-field techniques is nearly impossible due to the spatial and spectral overlap of the modes and their symmetry mismatch with incident radiation fields. This limitation can be circumvented by using localized excitation of the antenna. Here, we report on the experimental near-field probing of optical higher order cavity modes (CMs) and whispering gallery modes (WGMs) in amorphous silicon nanoantennas with simple, but fundamental, geometrical shapes of decreasing rotational symmetry: a disk, square, and triangle. Tapping into the near-field using an aperture type scanning near-field optical microscope (SNOM) opens a window on a rich variety of optical patterns resulting from the local excitation of antenna modes of different order with even and odd parity. Numerical analysis of the antenna and SNOM probe interaction shows how the near-field patterns reveal the node positions of – and allows us to distinguish between – cavity and whispering gallery modes. As such, this study contributes to a richer and deeper characterization of the structure of light in confined nanosystems, and their impact on the structuring of the light fields they generate.

High-Q whispering gallery modes in pillar microcavities

2007 ◽  
Vol 32 (2-3) ◽  
pp. 123-126
Author(s):  
Y.-R. Nowicki-Bringuier ◽  
J. Claudon ◽  
C. Böckler ◽  
S. Reitzenstein ◽  
M. Kamp ◽  
...  
Keyword(s):  
Whispering Gallery Modes ◽  
High Q ◽  
Whispering Gallery

Size-dependent whispering gallery modes in Au-coated ZnO microrods

2021 ◽  
Author(s):  
F. Bellarmine ◽  
Senthil Kumar Eswaran ◽  
Ramanjaneyulu Mannam ◽  
M. S. Ramachandra Rao
Keyword(s):  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Size Dependent

On the Abramov approach for the approximation of whispering gallery modes in prolate spheroids

2020 ◽  
pp. 125599
Author(s):  
Pierluigi Amodio ◽  
Anton Arnold ◽  
Tatiana Levitina ◽  
Giuseppina Settanni ◽  
Ewa B. Weinmüller
Keyword(s):  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Prolate Spheroids

All-optical tunable whispering gallery modes in a polymer bottle micro-resonator

2020 ◽  
pp. 1-1
Author(s):  
Hongxia Wang ◽  
Miaomiao Liao ◽  
Huifu Xiao ◽  
Zhenfu Zhang ◽  
Junbo Yang ◽  
...  
Keyword(s):  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
All Optical ◽  
Micro Resonator

scholarly journals Polariton Quantization Modes and Whispering Gallery Modes in a Cylindrical Microcavity

2021 ◽  
pp. 118220
Author(s):  
L.V. Kotova ◽  
P.G. Savvidis ◽  
L. Besombes ◽  
V.P. Kochereshko
Keyword(s):  
Whispering Gallery Modes ◽  
Whispering Gallery
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