Figure 4: Polarization controlled and optical router anapole nanolaser. | Nature Communications

Figure 4: Polarization controlled and optical router anapole nanolaser.

From: Anapole nanolasers for mode-locking and ultrafast pulse generation

Figure 4

(a) Working principle of the device based on directional coupling of anapole modes. Light pumping the anapole nanolaser placed in the middle of the circuit amplifies the corresponding anapole mode that tunnels energy in neighbouring channels according to the polarization of the input pump. (b) Electromagnetic energy distribution in the nanowire channel at steady state in the case of an Ex polarized pumping beam. (c) Same structure as in a,b, but with an In0.15Ga0.85As spherical nanoparticle replacing the anapole nanolaser (see (e), inset). The nanoparticle has the same radius as the nanodisk and is characterized by a strong resonance at the emission wavelength λ0. The emission of the nanoparticle is more than one order of magnitude larger than the anapole, as observed by comparing (b,c). However, it does not selectively couple to any channel due to the strongly radiating character of the emission intensity. (d,e) Normalized electromagnetic intensity evolution inside the nanowire channels. The intensity is normalized to the intensity of the electromagnetic field inside the nanodisk. The intensity coupled in each nanowire channel from the nanospheres (e) is four order of magnitude lower than for the anapole nanolaser (d).

Back to article page