期刊
NANO LETTERS
卷 15, 期 6, 页码 4102-4107出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01204
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资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2014M3C1A3052567, 2007-0093863, 2013K1A1A2035662]
- Basic Science Research Program through NRF [2014R1AIA1008604]
- Global Frontier Project through NRF [CAMM-2014M3A6B3063706]
- NRF [2013RIA2A1A01016914]
- [IBS-R004-D1]
- Ministry of Science, ICT & Future Planning, Republic of Korea [KINC01, NNFC-15-01] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2014M3A6B3063706, 2013R1A2A1A01016914, 2007-0093863] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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