Journal
NANO LETTERS
Volume 12, Issue 9, Pages 4997-5002Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl302665m
Keywords
Plasmonic; nanoantenna; broadband optical antenna; field enhancement; nonlinear optics; second harmonic generation
Categories
Funding
- U.S. Army International Technology Centre Atlantic (USAITC-A)
- Office of Naval Research (ONR)
- Office of Naval Research (ONR Global)
- Engineering and Physical Sciences Research Council (EPSRC)
- Leverhulme Trust
- EPSRC [EP/D063329/1, EP/H000917/2, EP/H000917/1, EP/I004343/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H000917/2, EP/D063329/1, EP/I004343/1, EP/H000917/1] Funding Source: researchfish
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We report the experimental realization of efficient tunable nanosources of second harmonic light with individual multiresonant log-periodic optical antennas. By designing the nanoantenna with a bandwidth of several octaves, simultaneous enhancement of fundamental and harmonic fields is observed over a broad range of frequencies, leading to a high second harmonic conversion efficiency, together with an effective second order susceptibility within the range of values provided by widespread inorganic crystals. Moreover, the geometrical configuration of the nanoantenna makes the generated second harmonic signal independent from the polarization of the fundamental excitation. These results open new possibilities for the development of efficient integrated nonlinear nanodevices with high frequency tunability.
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