Enhanced optical transmission of metallic nanohole arrays stimulated the blooming research efforts on plasmonics and
rich applications. Here we studied the dependence of enhanced optical absorption on geometric parameters by nanohole
arrays on gold films in infrared wavelength (8~12μm). An empirical modeling for enhanced optical absorption is
summarized (based on a great many of simulation data and deviation analysis, and its goodness-of-fit test and
significance test is acceptable), which takes consideration of not only single parameters but also interaction parameters of
geometries. Through t-test, the interaction parameters with high significance are chosen, which could give high optical
absorption, and the interaction of different parameters was evaluated via Analysis of Variance (ANOVA). Our study
represents a new guiding rule for uncooled infrared detector design.