Demonstrating nanophotonic switching using near-field pump-probe photoluminescence spectroscopy of CuCl quantum cubes.
We demonstrated a novel optical switching operation using three CuCl quantum cubes with a size ratio of. Their quantized excitonic energy levels resonate with one another, and the switching mechanism was based on the resonant near-field energy transfer between the quantum cubes. Using near-field pump-probe photoluminescence spectroscopy, we succeeded in controlling the near-field energy transfer and obtained a controlled (i.e. switched) signal in a differential photoluminescence spectrum with and without a pump beam. The internal quantum efficiency of the switching operation was close to 1. These results suggest the possibility of making a nanophotonic switching device smaller than 30 nm.
Kawazoe
T
T
Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Corporation (JST), 687-1 Tsuruma, Machida, Tokyo 194-0004, Japan. kawazoe@ohtsu.jst.go.jp
Kobayashi
K
K
Sangu
S
S
Ohtsu
M
M
D003300:Copper / Q000737:chemistry*; D004553:Electric Conductivity; D004867:Equipment Design; D008163:Luminescent Measurements; D020527:Microscopy, Scanning Probe / Q000379:methods; D036103:Nanotechnology / Q000379:methods*; D017785:Photons; D013050:Spectrometry, Fluorescence; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods*
D003300:Copper; C028419:cuprous chloride