dorsal/arxiv
View SchemaInvestigation of Whispering Gallery Modes in Circular Arrays of Dielectric Spherical Particles using multisphere Mie Scattering formalism
| Authors | Alexander L. Burin, Gail S. Blaustein, Olga M. Samoilova |
|---|---|
| Categories | |
| ArXiv ID | physics/0701068 |
| URL | https://arxiv.org/abs/physics/0701068 |
Abstract
quality factor depending on the material used. If these arrays consist of metal particles, then they cannot have a high quality factor because their light absorption restricts performance. In this paper we address the following question: can bound modes be formed in dielectric systems where the absorption of light is negligible? Our investigation of circular arrays of spherical particles within the framework of the multisphere Mie scattering theory using the simplest dipolarlike approach shows that (1) high quality modes in an array of 10 or more particles can be attained at least for a refractive index n > 2, so optical materials like TiO2 or GaAs can be used; (2) the most bound modes have nearly transverse polarization perpendicular to the circular plane; (3) in a particularly interesting case of TiO2 particles (rutile phase, n = 2.7), the quality factor of the most bound mode increases almost by an order of magnitude with the addition of 10 extra particles, while for particles made of GaAs the quality factor increases by almost two orders of magnitude with the addition of ten extra particles. The consideration of higher multipole contributions has demonstrated that the error of the dipolar approach does not exceed one percent if the refractive index nr is greater than 2. Minimum acceptable disordering not affecting the quality factor is studied.
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"abstract": "quality factor depending on the material used. If these arrays consist of\nmetal particles, then they cannot have a high quality factor because their\nlight absorption restricts performance. In this paper we address the following\nquestion: can bound modes be formed in dielectric systems where the absorption\nof light is negligible? Our investigation of circular arrays of spherical\nparticles within the framework of the multisphere Mie scattering theory using\nthe simplest dipolarlike approach shows that (1) high quality modes in an array\nof 10 or more particles can be attained at least for a refractive index n \u003e 2,\nso optical materials like TiO2 or GaAs can be used; (2) the most bound modes\nhave nearly transverse polarization perpendicular to the circular plane; (3) in\na particularly interesting case of TiO2 particles (rutile phase, n = 2.7), the\nquality factor of the most bound mode increases almost by an order of magnitude\nwith the addition of 10 extra particles, while for particles made of GaAs the\nquality factor increases by almost two orders of magnitude with the addition of\nten extra particles. The consideration of higher multipole contributions has\ndemonstrated that the error of the dipolar approach does not exceed one percent\nif the refractive index nr is greater than 2. Minimum acceptable disordering\nnot affecting the quality factor is studied.",
"arxiv_id": "physics/0701068",
"authors": [
"Alexander L. Burin",
"Gail S. Blaustein",
"Olga M. Samoilova"
],
"categories": [
"physics.optics",
"physics.chem-ph"
],
"title": "Investigation of Whispering Gallery Modes in Circular Arrays of Dielectric Spherical Particles using multisphere Mie Scattering formalism",
"url": "https://arxiv.org/abs/physics/0701068"
},
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