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Contrast in transmission spectroscopy of a single quantum dot

2007; American Institute of Physics; Volume: 90; Issue: 22 Linguagem: Inglês

10.1063/1.2743750

1520-8842

Brian D. Gerardot, Stefan Seidl, Paul A. Dalgarno, Richard J. Warburton, Martin Kroner, K. Karraï, A. Badolato, P. M. Petroff,

Molecular Junctions and Nanostructures

The authors perform transmission spectroscopy on single quantum dots and examine the effects of a resident carrier’s spin, the incident laser spot size, polarization, and power on the experimental contrast. They demonstrate a factor of 5 improvement in the maximum contrast by using a solid immersion lens to decrease the spot area. This increase yields a maximum signal to noise ratio of ∼2000Hz−1∕2, which will allow for megahertz detection frequencies. The authors anticipate that this improvement will allow further investigation of spectral fluctuation and open up the feasibility for an all-optical readout of an electron spin in a quantum dot.