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(a) Absorption and λres dependence on HPHMB, (b) R/T/A plot of a polyhexamethylene biguanide (PHMB) coated PA. Here the PHMB is optimized at 100 nm. The geometric parameters of the design are R = 150 nm, d = 260 nm, HSi = 50 nm, HAu = 100 nm and HPHMB = 100 nm.
