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We present two types of metamaterial-based spectral bandpass filters for theterahertz (THz) frequency range. The metamaterials are specifically designed tooperate for waves at normal incidence and to be independent of the fieldpolarization. The functional structures are embedded in films ofbenzocyclobutene (BCB) resulting in large-area, free-standing and flexiblemembranes with low intrinsic loss.  The proposed filters are investigated by THz time-domain spectroscopy andshow a pronounced transmission peak with over 80]% amplitude transmission inthe passband and a transmission rejection down to the noise level in thestopbands. The measurements are supported by numerical simulations whichevidence that the high transmission response is related to the excitation oftrapped modes.

Highly Selective Terahertz Bandpass Filters Based on Trapped Mode Excitation