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(a) Experimental setup, BK7 is glass with a transferred graphene film, L1 and L2 are lenses, HWP is a half-wave plate used to adjust intensity, P1 and P2 are Glan laser polarizers, CCD is a charge-coupled device; (b) determination of graphene layer numbers using the Spin Hall Effect (reproduced with permission from ref. [91], Copyright 2012, AIP).
