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By Robert Jan Moerland.

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Therefore, once a mode has been set for the molecule to emit into, it usually cannot be changed. This chapter describes how a priori control, and reversible change of the polarization of the emitted light of a single molecule can be manipulated by changing the local environment of the molecule with a nanoscale object. 2 Polarization control in the near field With simplifications, the general principle of polarization control of a single molecule, and the physics involved, can be explained with electrostatics.

The height of the probe above the molecule, is obtained from the experiments for molecule 1, with the same probe. f. 10. The values obtained are plotted in the graph shown in Fig. 12. The absolute height, corresponding to an engaged shear-force feedback, is set to 23 nm as found at φ = 0 for the model incorporating probe tilt. g. the engaged feedback probe–surface distance, is approximately 2. 4. 12 – Polarization ratio as a function of distance. The measured polarization ratio goes up to a factor of 2 for the engaged height feedback.

5 depicts the particular configuration where the dipole is located right underneath the vertical edge of the disk. The local electric field distribution is obtained by use of the multiple multipole (MMP) method [73]. For this situation the x-polarized and y-polarized intensity distributions in the back focal plane of a high-NA objective are calculated. The objective is positioned in the −z half-space with its optical axis aligned to the z-axis. For a z-oriented dipole having no objects in its near field, one expects a cylindrically symmetric emission pattern [81, 82].

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