Fig. 1: Linear and spinning Janus dipoles. | Light: Science & Applications

Fig. 1: Linear and spinning Janus dipoles.

From: Experimental demonstration of linear and spinning Janus dipoles for polarisation- and wavelength-selective near-field coupling

Fig. 1

A nanoparticle whose electric and magnetic polarisabilities have a fixed phase difference at a specified wavelength scatters light like a dipolar source with electric and magnetic dipole moments that feature a phase difference determined by the intrinsic polarisabilities. Left: incident E and H fields as functions of time. Right: dipole moments p and m of the nanoparticle as functions of time. When the phase difference between the two polarisabilities is π/2, a the nanoparticle under linearly polarised plane wave illumination will scatter like a linear Janus dipole. b The same nanoparticle under circularly polarised plane wave illumination will scatter like a spinning Janus dipole (the electric and magnetic fields rotate in the same way and are oriented antiparallel at all times). An additional global phase-delay between the excitation fields and the resulting dipoles is omitted from the sketch

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