title: Site-selective optical coupling of PbSe nanocrystals to Si-based photonic crystal microcavities.
abstract: A novel method for patterning optically active colloidal PbSe nanocrystals on Si surfaces is reported. Oleate-capped PbSe nanocrystals were found to adhere preferentially to H-terminated Si surfaces over oxide and alkyl-terminated Si surfaces. Scanning probe lithography was used to oxidize locally a dodecyl monolayer on the Si surface of a silicon-on-insulator wafer prepatterned with photonic crystal microcavities. Aqueous HF was then used to remove the oxide and expose H-terminated Si areas, yielding patterned PbSe nanocrystals on the Si surface after exposure to a nanocrystal solution. This patterning technique allows for the selective deposition of PbSe nanocrystals at the main antinode of the silicon-based microcavities. More than a 10-fold photoluminescence enhancement due to the cavity-nanocrystal coupling was observed.
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: Andras G
authors.initials: AG
authors.lastname: Pattantyus-Abraham
authors.forename: Haijun
authors.initials: H
authors.lastname: Qiao
authors.forename: Jingning
authors.initials: J
authors.lastname: Shan
authors.forename: Keith A
authors.initials: KA
authors.lastname: Abel
authors.forename: Tian-Si
authors.initials: TS
authors.lastname: Wang
authors.forename: Frank C J M
authors.initials: FC
authors.lastname: van Veggel
authors.forename: Jeff F
authors.initials: JF
authors.lastname: Young