Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: Plasmonics and Nanooptics III

O 71.10: Vortrag

Donnerstag, 3. April 2014, 12:45–13:00, GER 38

Modified Solid Immersion Lens Design for Efficient Light Extraction — •Andreas W. Schell, Tanja Neumer, and Oliver Benson — Humboldt-Universität zu Berlin, Institut für Physik, AG Nanooptik, D-12489 Berlin, Germany

For solid-state single photon emitters, like quantum dots or defect centers like the nitrogen vacancy (NV) center in diamond, it usually is very difficult to efficiently extract the photons. Due to the high refractive index of the host material, many photons are totally internal reflected at the material's planar interface -- photons which are basically lost. An elegant way to circumvent this problem is to use of so called solid immersion lenses (SILs). In analogy to the immersion oil in oil immersion microscopy these lenses are made to suppress total internal reflection. Standard SILs are based on a spherical geometry, with the hemispherical SIL being most common.

Here, we will show a design based on ellipsoids and verify its usefulness via three-dimensional finite difference time domain (FDTD) simulations. These structures can be easily produced using the process of two-photon direct laser writing, a process which also allows for direct integration of single photon emitters [1]. Our modified SILs are able to not only collect light, but also do also make use of controlled total internal reflection to direct the light into a very small solid angle while maintaining a high overlap with a Gaussian beam, solving two drawbacks of standard SIL designs at once.

[1] A. W. Schell et al., Scientific Reports 3, 1577 (2013).