Journal article
Highly directive and Gaussian far-field emission from “giant” photonic trumpets
Photonic trumpets are broadband dielectric antennas that efficiently funnel the emission of a pointlike quantum emitter—such as a semiconductor quantum dot—into a Gaussian free-space beam. After describing guidelines for the taper design, we present a “giant” photonic trumpet. The device features a bottom diameter of 210 nm and a 5 lm wide top facet.
Using Fourier microscopy, we show that 95% of the emitted beam is intercepted by a modest numerical aperture of 0.35. Furthermore, far-field measurements reveal a highly Gaussian angular profile, in agreement with the predicted overlap to a Gaussian beam Mg ¼ 0:98. Future application prospects include the direct coupling of these devices to a cleaved single-mode optical fiber.
The calculated transmission from the taper base to the fiber already reaches 0.59, and we discuss strategies to further improve this figure of merit.
Language: | English |
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Publisher: | AIP Publishing LLC |
Year: | 2015 |
Pages: | 141106 |
ISSN: | 10773118 and 00036951 |
Types: | Journal article |
DOI: | 10.1063/1.4932574 |
ORCIDs: | 0000-0001-9788-9210 , Gregersen, Niels and Mørk, Jesper |