Bowtie nanoantenna

Fromm, D.P., A. Sundaramurthy, P.J. Schuck, G.S. Kino, and W.E. Moerner. 2004. Gap-dependent optical coupling of single bowtie nanoantennas resonant in the visible. Nano Lett. 4 957-961. 

Jackel, F., Kinkhabwala, A.A., and Moerner, W.E. (2007) Gold bowtie nanoantennas for surface-enhanced Raman scattering under controlled electrochemical potential. Chemical Physics Letters, 446, 339-343. 

P. J. Schuck et al.. Improving the mismatch between light and nanoscale objects with gold bowtie nanoantennas, Physical Review Letters, 94(1), 017402-017404 (2005). 

Another very often met nanoantenna stmcture is the bowtie nanoantenna [313]. It consists of two triangles aligned along their symmetry axes. A feed gap is formed between their tips. Bowtie antennas have a broader bandwidth together and at the same time ensure large field localizations in the feed gap. A similar type of antenna is the diabolo-type nanoantenna [314], where the triangles overlap. 

An important group of nanoantennas are those based on the Babinet principle. A metal shape surrounded by dielectric and a dielectric-filled hole in metal with identical shape and size have identical diliiaction patterns. Thus bowtie shaped holes in metal can be used, two holes are a Babinet equivalent of a nanodimer, arrays of nanoholes are equivalent of arrays of nanoparticles, crossed arrays of nanoholes correspond to crossed arrays of nanoparticles, etc. [318]. 

Sundaramurthy, A., Schuck, P. J., Conley, N. R., Fromm, D. R, Kino, G. S., and Moerner, W. E. (2006) Toward nanometer-scale optical photolithography Utilizing the near-field of bowtie optical nanoantennas. Nano Lett, 6, 355-360. 

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