We investigate field enhancements in two-dimensional periodic arrays of ( deep) V-grooves (opening angles ) fabricated using focused ion beam milling in a thick gold film on top of a fused silica substrate. Simulated and experimental reflection spectra, high-resolution two-photon luminescence (TPL) images, and microscopy of surface-enhanced Raman scattering (SERS) obtained from the V-groove metal arrays are compared and reveal good correspondence in the spectral dependences of reflection and local TPL as well as SERS measured at the groove bottom. We relate the obtained field intensity enhancements, reaching with nanofocusing and resonant interference of counterpropagating plasmons by the periodic closed tapered groove gaps. The achieved reflection spectra and enhancements depend on the geometry of the V-groove arrays and can actually be tuned in the wavelength range from visible to infrared, making this configuration promising for a wide range of practical applications, e.g., within surface-enhanced spectroscopies.
© 2011 Optical Society of AmericaFull Article | PDF Article
Jonas Beermann, Andrey Evlyukhin, Alexandra Boltasseva, and Sergey I. Bozhevolnyi
J. Opt. Soc. Am. B 25(10) 1585-1592 (2008)
Jonas Beermann, Sergey M. Novikov, Thomas Søndergaard, Alexandra E. Boltasseva, and Sergey I. Bozhevolnyi
Opt. Express 16(22) 17302-17309 (2008)
Jonas Beermann, Sergey M. Novikov, Kristjan Leosson, and Sergey I. Bozhevolnyi
Opt. Express 17(15) 12698-12705 (2009)