dualband perfect absorber for multispectral plasmonenhanced infrared spectroscopy metamaterialbased perfect absorbers utilize intrinsic loss with the aid of appropriate structural design to achieve near unity absorption at a certain wavelength for most of the reported absorbers the absorption occurs only at a single wavelength where plasmon resonances are excited in the nanostructures here we introduce a dualband perfect absorber based on a gold nanocross structure two bands of maximum absorption of 94 are experimentally accomplished by breaking the symmetry of the cross structure furthermore we demonstrate the two bands can be readily tuned throughout the midinfrared with their associated resonances giving rise to large nearfield enhancements these features are ideal for multiband surfaceenhanced infrared spectroscopy applications we experimentally demonstrate this application by simultaneously detecting two molecular vibrational modes of a 4 nm thick polymer film utilizing our proposed absorber furthermore in response to variations in the interaction strength between the plasmonic and molecular dipoles we observe an anticrossing behavior and modification in the spectral line shape of the molecular absorption peak which are characteristic of the coupling between the two modes