Figure 2 | Scientific Reports

Figure 2

From: Vortex Laser based on III-V semiconductor metasurface: direct generation of coherent Laguerre-Gauss modes carrying controlled orbital angular momentum

Figure 2

Schematics of (a) Plano-concave type cavity supporting LG basis, and (b) same cavity with an intensity selective filter and SPM. (c) Photon energy (frequency ν) -momentum (quantum number) dispersion diagram for the first three non degenerate and degenerate LGpl transverse modes, with longitudinal mode number q; modes having same OAM charge but opposite handedness have degenerate frequencies and symmetric wave-functions; momenta are normalized to ħΔkφ (see Eq. 2). (d) Introduction of the SPM lifts orbital frequency degeneracy and breaks orbital wave-function symmetry for modes with opposite charge ±l.

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