Surface Second-Harmonic Generation from Vertical GaP Nanopillars
2012 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 12, no 2, 820-826 p.Article in journal (Refereed) Published
We report on the experimental observation and analysis of second-harmonic generation (SHG) from vertical GaP nanopillars. Periodic arrays of GaP nanopillars with varying diameters ranging from 100 to 250 nm were fabricated on (100) undoped GaP substrate by nanosphere lithography and dry etching. We observed a strong dependence of the SHG intensity on pillar diameter. Analysis of surface and bulk contributions to SHG from the pillars including the calculations of the electric field profiles and coupling efficiencies is in very good agreement with the experimental data. Complementary measurements of surface optical phonons by Raman spectroscopy are also in agreement with the calculated field intensities at the surface. Finally, polarization of the measured light is used to distinguish between the bulk and surface SHG from GaP nanopillars.
Place, publisher, year, edition, pages
2012. Vol. 12, no 2, 820-826 p.
Nanopillars, nanoscopic light source, second-harmonic generation, surface SHG, surface phonons, gallium phosphide
Other Engineering and Technologies
IdentifiersURN: urn:nbn:se:kth:diva-92065DOI: 10.1021/nl203866yISI: 000299967800049ScopusID: 2-s2.0-84856962962OAI: oai:DiVA.org:kth-92065DiVA: diva2:512105
FunderSwedish Research Council
QC 201203262012-03-262012-03-262014-11-04Bibliographically approved