Abstract
ABSTRACT We demonstrate that the optical response of a single Au bowtie nano-antenna (BNA) can be favorably modiedto increase the local intensity by a factor of 10 3 in the feed gap region when a periodic array of BNAs are used.We use the periodicity of the arrays as an additional degree of freedom in manipulating the optical response andinvestigate the behavior of the resultant nonlinear emission, which include second harmonic generation (SHG),two-photon photoluminescence (TPPL), and an additional photoluminescence that cannot be attributed to asingle multiphoton process. We discuss the eects of the array with respect to the nonlinear emission and also ndthat the considerable eld enhancement of our antenna system leads to a broadband continuum whose spectralresponse is highly controllable. Resonantly excited arrays of BNAs were seen to exhibit a remarkably uniformemission over 250 nm of the visible spectrum. In addition, our analysis suggests that high eld enhancements,as well as resonance matching, may not be the only preconditions for enhanced nonlinear emission. To ourknowledge, this is the rst report of implementing optical antennas in an array to favorably augment its opticalresponse.Keywords: Nonlinear optics, continuum generation, nanoantenna, plasmonic nanostructures, eld enhance-ment.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
