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(a) Configuration of single-nanoparticle detection with mode splitting. (b) Illustration of transmission spectra with (solid curve) and without (dashed curve) mode splitting.
Detection signal depending on its refraction index for different geometries in cavity mode fields (TE or TM). The orientations of the nanoparticle are sketched in the insets: (a) a nanosphere lying and a nanoclylinder standing (b) or lying (c) on the cavity surface. Here, the refraction index of the liquid surrounding is set as . The height and aspect ratio of the nanocylinder are 50 nm and 2:1. The nanosphere has the same volume with the nanocylinder.
Detection signal depending on the nanocylinder orientation on the microcavity surface. (a) and (b) correspond to the cases that the nanoparticle is polarized by TE and TM modes, respectively. Here, is defined as the angle between the axis of the nanocylinder and the electric field direction of TM mode (normal of the microcavity surface), while is defined as the angle between the electric field direction of TE mode (tangent of the microcavity surface) and the projection of the axis of the nanocylinder on surface, as shown in the inset of (a).
Detection limit volume of nanoparticle vs its refraction index for different geometries in cavity mode fields (TE and TM). The refraction index of the liquid surrounding is set as . The used toroidal microcavity has principal and minor diameters of 60 and , respectively, and , , and .
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