Acoustically Driven Photon Antibunching in Nanowires

作者：Hernandez Minguez A^*; Moeller M; Breuer S; Pfuller C; Somaschini C; Lazic S; Brandt O; Garcia Cristobal A; de Lima M M Jr; Cantarero A; Geelhaar L; Riechert H; Santos P V

来源：Nano Letters, 2012, 12(1): 252-258.

DOI：10.1021/nl203481m

• Nanowires
• surface acoustic waves
• acoustic charge transport
• photoluminescence
• single photon emission

The oscillating piezoelectric field of a surface acoustic wave (SAW) is employed to transport photoexcited carriers, as well as to spatially control exciton recombination in GaAs-based nanowires (NWs) on a subns time scale. The experiments are carried out in core-shell NWs transferred to a SAW delay line on a LiNbO3 crystal. Carriers generated in the NW by a focused laser spot are acoustically transferred to a second location, leading to the remote emission of subns light pulses synchronized with the SAW phase. The dynamics of the carrier transport, investigated using spatially and time-resolved photoluminescence, is well-reproduced by computer simulations. The high-frequency contactless manipulation of carriers by SAWs opens new perspectives for applications of NWs in opto-electronic devices operating at gigahertz frequencies. The potential of this approach is demonstrated by the realization of a high-frequency source of antibunched photons based on the acoustic transport of electrons and holes in (In,Ga)As NWs.

• 出版日期2012-1