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  • Title: Enhanced second-harmonic generation from double resonant plasmonic antennae.
    Author: Thyagarajan K, Rivier S, Lovera A, Martin OJ.
    Journal: Opt Express; 2012 Jun 04; 20(12):12860-5. PubMed ID: 22714312.
    Abstract:
    We present a novel plasmonic antenna geometry - the double resonant antenna (DRA) - that is optimized for second-harmonic generation (SHG). This antenna is based on two gaps coupled to each other so that a resonance at the fundamental and at the doubled frequency is obtained. Furthermore, the proximity of the localized hot spots allows for a coupling and spatial overlap between the two field enhancements at both frequencies. Using such a structure, both the generation of the second-harmonic and its re-emission into the far-field are significantly increased when compared with a standard plasmonic dipole antenna. Such DRA are fabricated in aluminium using electron beam lithography and their linear and nonlinear responses are studied experimentally and theoretically.
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