Squeezing Photons into a Point-Like Space

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Confining photons in the smallest possible volume has long been an objective of the nanophotonics community. In this Letter, we propose and demonstrate a three-dimensional (3D) gap-plasmon antenna that enables extreme photon squeezing in a 3D fashion with a modal volume of 1.3 x 10(-7) lambda(3) (similar to 4 x 10 x 10 nm(3)) and an intensity enhancement of 400 000. A three-dimensionally tapered 4 nm air-gap is formed at the center of a complementary nanodiabolo structure by ion-milling 100 nm-thick gold film along all three dimensions using proximal milling techniques. From a 4 nm-gap antenna, a nonlinear second-harmonic signal more than 27 000-times stronger than that from a 100 nm-gap antenna is observed. In addition, scanning cathodoluminescence images confirm unambiguous photon confinement in a resolution-limited area 20 x 20 nm(2) on top of the nano gap.
Publisher
AMER CHEMICAL SOC
Issue Date
2015-06
Language
English
Article Type
Article
Keywords

OPTICAL ANTENNAS; HARMONIC-GENERATION; FIELD ENHANCEMENT; NANOMETER-SCALE; GAP PLASMONS; NANOANTENNAS; TRANSMISSION; EMISSION; EMITTERS; LASERS

Citation

NANO LETTERS, v.15, no.6, pp.4102 - 4107

ISSN
1530-6984
DOI
10.1021/acs.nanolett.5b01204
URI
http://hdl.handle.net/10203/200066
Appears in Collection
PH-Journal Papers(저널논문)
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