Fig. 4: Experimental measurement of PL spectra and valley polarization in momentum space. | Light: Science & Applications

Fig. 4: Experimental measurement of PL spectra and valley polarization in momentum space.

From: Routing valley exciton emission of a WS2 monolayer via delocalized Bloch modes of in-plane inversion-symmetry-broken photonic crystal slabs

Fig. 4

a–d σ+ and σ− PL intensity distribution in momentum space at 615 nm (upper) and 628 nm (lower). These are for the WS2 monolayer on the PhC slab without in-plane inversion symmetry. e, f Images of valley polarization P(k) in momentum space. The maximum calculated P reaches 88%

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