The corner effect in hexagonal whispering gallery microresonators

C. P. Dietrich; M. Lange; T. Boentgen; M. Grundmann

doi:10.1063/1.4757572

The corner effect in hexagonal whispering gallery microresonators

C. P. Dietrich^*, M. Lange, T. Boentgen, M. Grundmann

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Hexagonal microresonators were investigated regarding the influence of the nanometer scale geometry of their corners on light out-coupling, mode quality factor, and lasing threshold of whispering gallery modes (WGMs). For this purpose, ZnO microwires with hexagonal cross section grown by carbothermal vapor-phase transport were fabricated. It turned out that their corners can either be sharp (curvature radius r(C) <10 nm) or be blunt (r(C) approximate to 400 nm). Blunt corners enhance light out-coupling of WGM in the low-excitation regime but otherwise increase mode linewidth. Sharp corners hinder light out-coupling at low excitations leading to long cavity photon lifetimes and facilitating room-temperature WGM lasing at lowest reported lasing thresholds of 73 kW/cm(2). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757572]

Original language	English
Article number	141116
Number of pages	5
Journal	Applied Physics Letters
Volume	101
Issue number	14
DOIs	https://doi.org/10.1063/1.4757572
Publication status	Published - 1 Oct 2012

Keywords

MICRODISK LASERS
MODE
RESONATORS
EMISSION
FIBER

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10.1063/1.4757572

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title = "The corner effect in hexagonal whispering gallery microresonators",

abstract = "Hexagonal microresonators were investigated regarding the influence of the nanometer scale geometry of their corners on light out-coupling, mode quality factor, and lasing threshold of whispering gallery modes (WGMs). For this purpose, ZnO microwires with hexagonal cross section grown by carbothermal vapor-phase transport were fabricated. It turned out that their corners can either be sharp (curvature radius r(C) <10 nm) or be blunt (r(C) approximate to 400 nm). Blunt corners enhance light out-coupling of WGM in the low-excitation regime but otherwise increase mode linewidth. Sharp corners hinder light out-coupling at low excitations leading to long cavity photon lifetimes and facilitating room-temperature WGM lasing at lowest reported lasing thresholds of 73 kW/cm(2). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757572]",

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T1 - The corner effect in hexagonal whispering gallery microresonators

AU - Dietrich, C. P.

AU - Lange, M.

AU - Boentgen, T.

AU - Grundmann, M.

PY - 2012/10/1

Y1 - 2012/10/1

N2 - Hexagonal microresonators were investigated regarding the influence of the nanometer scale geometry of their corners on light out-coupling, mode quality factor, and lasing threshold of whispering gallery modes (WGMs). For this purpose, ZnO microwires with hexagonal cross section grown by carbothermal vapor-phase transport were fabricated. It turned out that their corners can either be sharp (curvature radius r(C) <10 nm) or be blunt (r(C) approximate to 400 nm). Blunt corners enhance light out-coupling of WGM in the low-excitation regime but otherwise increase mode linewidth. Sharp corners hinder light out-coupling at low excitations leading to long cavity photon lifetimes and facilitating room-temperature WGM lasing at lowest reported lasing thresholds of 73 kW/cm(2). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757572]

AB - Hexagonal microresonators were investigated regarding the influence of the nanometer scale geometry of their corners on light out-coupling, mode quality factor, and lasing threshold of whispering gallery modes (WGMs). For this purpose, ZnO microwires with hexagonal cross section grown by carbothermal vapor-phase transport were fabricated. It turned out that their corners can either be sharp (curvature radius r(C) <10 nm) or be blunt (r(C) approximate to 400 nm). Blunt corners enhance light out-coupling of WGM in the low-excitation regime but otherwise increase mode linewidth. Sharp corners hinder light out-coupling at low excitations leading to long cavity photon lifetimes and facilitating room-temperature WGM lasing at lowest reported lasing thresholds of 73 kW/cm(2). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757572]

KW - MICRODISK LASERS

KW - MODE

KW - RESONATORS

KW - EMISSION

KW - FIBER

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DO - 10.1063/1.4757572

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VL - 101

JO - Applied Physics Letters

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The corner effect in hexagonal whispering gallery microresonators

Abstract

Keywords

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