The present invention provides an improved integrated system for biological marker identification. The electrode design of this piezoelectric element is characterized by two electrodes mounted on at least one of the surfaces. The fire retardant system of the present invention is essentially halogen-free. Furthermore, the light attenuating compounds are useful for absorbing light at shorter wavelengths. Further, the invention provides control of backscattering and, controlling any combination of scattering, absorption and backscattering of electromagnetic waves.