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. 2020 Dec 23;15(1):809–818. doi: 10.1021/acsnano.0c07198

Figure 2.

Figure 2

Schematic illustration of the sector areas on a PDG for (a) SEF and SERS (PDG Δr = 450 nm, d = 140 nm; Stokes shift = 2400 cm–1; λex = 633 nm) and (b) SECARS (PDG Δr = 700 nm, d = 400 nm; anti-Stokes shift = 1070 cm–1; λpump = 955 nm; λStokes = 1064 nm; λanti-Stokes = 867 nm). The range of azimuthal angle for each sector area is analytically calculated. The expected situations of enhancement are summarized on the right side of Figure 2.