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Bloch surface waves-controlled fluorescence emission: Coupling into nanometer-sized polymeric waveguides APL: Org. Electron. Photonics 5, 39 (2012) Bloch surface waves-controlled fluorescence emission: Coupling into nanometer-sized polymeric waveguides Appl. Phys. Lett. 100, 063305 (2012) Identifying and evaluating organic nonlinear optical materials via molecular moments J. Appl. Phys. 111, 033512 (2012) Elastomeric silicone substrates for terahertz fishnet metamaterials Appl. Phys. Lett. 100, 061101 (2012) Functionalizing the rear scatterer in a luminescent solar concentrator J. Renewable Sustainable Energy 4, 013103 (2012) Additional information on Appl. Phys. Lett.

Using evanescent field coupling via frustrated total internal reflection, we measured whispering-gallery optical resonances of polystyrene microspheres held in aqueous buffer by optical tweezers, as a function of the distance from the planar coupling substrate. An intrinsic Q factor of 4×106 was found for a microsphere of 30μm diameter, indicating the potential of such microresonators for highly sensitive biomolecular detection. These measurements provide an upper limit of 2×10−7 for the imaginary part of the complex refractive index of polystyrene at 770nm wavelength.

We investigate the detuning of whispering gallery modes (WGMs) in solid polystyrene microspheres (PM) as a function of axisymmetric stress applied to two antipodal points of the microsphere we call poles. We specifically investigate WGMs passing close to these poles, so-called polar WGMs. The applied uniaxial pressure reduces the geometrical circumference of the PM but also increases locally the refractive index at the flattened poles. Our experiments show that the WGMs shift to higher frequencies with increasing pressure and that the magnitude of the strain-induced shift depends on the radial mode number n. Furthermore an energy splitting between azimuthal modes linearly increasing with the pressure is observed. A theoretical model based on a classical ray optics approach is presented which reproduces the main results of our experimental observations. V

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