devices and techniques are disclosed for sequencing , fingerprinting , or mapping bio - polymer molecules in micro - array format by tagging molecules with radiation absorbing particles and exposing tagged molecules to electromagnetic radiation such as microwave radiation . the use of radiation absorbing material for tagging enhances detection sensitivity by dissipating energy of the radiation in spots on surface where tagged molecules are located . proposed system can be particularly beneficial when used as a reader system for dna and protein microarrays in genomic and proteomic applications , for reading affinity assays , and for detection of a trace amount of chemical or biological species of interest on a surface .