期刊
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
卷 11, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1464-4258/11/11/114030
关键词
nonlinear plasmonics; four-wave mixing; second-harmonic generation; sum-frequency generation; near-field optics; nano-optics; plasmonics; near-field optical imaging
类别
We investigate the nonlinear optical properties of gold nanoparticle pairs. Two excitation beams of frequencies omega(1) and omega(2) are used to induce nonlinear polarizations at the junction of a particle dimer. Nonlinearities of the second and third order can be controllably induced as a function of the dimer geometry, leading predominantly to second-harmonic generation (SHG), sum frequency generation (SFG) and four-wave mixing (4WM). Due to their center symmetry, dimers with identical particle diameters give rise to a very weak second-order response, without affecting the third-order response. Therefore, a sharp probe functionalized with a symmetric metal dimer acts as a nanoscale photon source emitting narrow-band photons of frequency 2 omega(1) - omega(2). We demonstrate that this source can be employed as a near-field optical probe for high-resolution fluorescence imaging.
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