Enhanced second harmonic generation from nanoscale double-hole arrays in a gold film

We present enhanced second harmonic generation (SHG) from arrays with a basis of overlapping double holes. The arrays were created by focused-ion beam milling through a gold film, and the measurements were performed in the transmission geometry. By fixing the array periodicity and varying the spacing between the holes, the SHG was enhanced by an order of magnitude for the single case where the apexes of the double-hole structure were nearly touching. Numerical calculations showed a local electric field enhancement that agrees with the SHG observations. This work shows the potential of double-hole structures for nonlinear optics at the nanoscale.

[1]  D. Bergman,et al.  Self-similar chain of metal nanospheres as efficient nanolens , 2003, InternationalQuantum Electronics Conference, 2004. (IQEC)..

[2]  O. Martin,et al.  Resonant Optical Antennas , 2005, Science.

[3]  M. Stockman,et al.  Nanofocusing of optical energy in tapered plasmonic waveguides. , 2004, Physical review letters.

[4]  K. Bennemann.  Nonlinear Optics in Metals , 1999 .

[5]  Stefan Enoch,et al.  Role of shape and localized resonances in extraordinary transmission through periodic arrays of subwavelength holes: Experiment and theory , 2005 .

[6]  M. Raschke,et al.  Second-harmonic generation from nanoscopic metal tips: Symmetry selection rules for single asymmetric nanostructures , 2005 .

[7]  K. Kavanagh,et al.  Basis and lattice polarization mechanisms for light transmission through nanohole arrays in a metal film. , 2005, Nano letters.

[8]  Anatoly V. Zayats,et al.  NEAR-FIELD SECOND HARMONIC GENERATION FROM A ROUGH METAL SURFACE , 1997 .

[9]  Steve Blair,et al.  Second-harmonic generation from an array of sub-wavelength metal apertures , 2005 .

[10]  N. V. van Hulst,et al.  Strong influence of hole shape on extraordinary transmission through periodic arrays of subwavelength holes. , 2004, Physical review letters.

[11]  Vahid Sandoghdar,et al.  Second-harmonic generation from individual surface defects under local excitation , 2000 .

[12]  LETTER TO THE EDITOR: Strong second-harmonic radiation from a thin silver film with randomly distributed small holes , 2003 .

[13]  Thomas W. Ebbesen,et al.  Optical transmission properties of a single subwavelength aperture in a real metal , 2004 .

[14]  Ajay Nahata,et al.  Enhanced nonlinear optical conversion from a periodically nanostructured metal film. , 2003, Optics letters.

[15]  G S Kino,et al.  Improving the mismatch between light and nanoscale objects with gold bowtie nanoantennas. , 2005, Physical review letters.

[16]  H. Lezec,et al.  Multiple paths to enhance optical transmission through a single subwavelength slit. , 2003, Physical review letters.

[17]  W. Schaff,et al.  Intrinsic electron accumulation at clean InN surfaces. , 2004, Physical review letters.

[18]  Jonas Beermann,et al.  Direct observation of localized second-harmonic enhancement in random metal nanostructures. , 2003, Physical review letters.

[19]  Arto V. Nurmikko,et al.  Strongly Interacting Plasmon Nanoparticle Pairs: From Dipole−Dipole Interaction to Conductively Coupled Regime , 2004 .