Antennas are coupled with infrared (IR) detectors for enhancing thermal absorption performance for target detection applications. This work presents the design of a nano-patch antenna on high-permittivity silicon substrates for providing multi-band operation at infrared frequencies, for integration with superconducting IR detector applications. In addition to a superconductor, this patch supports triple-band operation at 16 THz, 21.5 THz and 27 THz. This multi-band resonance has been achieved by the introduction of two slots in an asymmetrical manner. Spatial feeding technique has been utilized for exciting the antenna during the numerical evaluation of its radiation characteristics using the method of moments (MoM) and finite element method (FEM). Radiation characteristics such as efficiency, gain, etc. obtained using both techniques match well. The proposed structure has better impedance matching characteristics at the desired resonance and in multi-band operation with a voltage standing wave ratio (VSWR) value of less than 2 in the band of frequencies. The multi-band characteristics have been confirmed further by obtaining the current distributions through the surface of the top metallic patch. In addition, the effect of ground plane replaced fully with niobium nitride (NbN) has been analyzed and discussed in this paper. Finally, the effect of substrate variations in the radiation performance of the IR patch has been studied and numerical analysis of the corresponding resistive loss behavior for the incident x-polarized electromagnetic wave has been done which confirmed the absorption of incident waves at the designed multi-band frequencies. © 2018, The Minerals, Metals & Materials Society.