Abstract
Gold nanohole arrays of various hole sizes with fixed thickness are fabricated using colloidal lithography. The degree of ordering of gold nanohole arrays was obtained by using a pair correlation function and a bond-orientation order parameter. Reflectance studies show signatures of surface plasmon polaritons and their coupling with localized surface plasmon resonance (LSPR). These optical responses are found to be dependent on the hole size variations and their ordering. The spectral resolution of resonances is evaluated and found to improve with long-range ordering and a higher bond-orientational order parameter of nanohole arrays. Based on order quantification and optical response, the optimal sample exhibiting coupling of LSPR and surface plasmon polaritons is chosen for refractive index sensing, yielding sensitivity of 470.49 nm/RIU and figure of merit of 14.42.
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