NOVELTY - The system comprises superlattice detector (10) of semiconductor material having layered structure with distinct natural energy band gap, electrode units attached to opposite extremes of layered structure, tuner for tuning the response energy gap of superlattice and to alter wavelength band to which detector responds, and sensor connected to electrode units, to sense the detector response.    USE - For use in photoconductive detectors and photovoltaic detectors.    ADVANTAGE - The detector system is excellent in electromagnetic tunability, and increase in conductivity is detected. The wavelengths of the peak response or energy band gap of the detector in response to electromagnetic radiation, may be modulated. The semiconductor response output can be detected by conventional current or voltage methods measuring long utilized for such detectors. The band gap energy associated with the superlattice material may also be varied, i.e. tunability is achieved, through the application of mechanical and physical pressure such as compressive force, to the superlattice detector system. The detector enables to synthesize semiconductors with any required band gap and eliminates the need for expensive optical filters.    DETAILED DESCRIPTION - The detector has conductive layers (C1) spaced by alternate conductive layers (C2). The layered structured has distinct natural energy band gap which produces a characteristic response to electromagnetic radiation of given range of wavelengths which incident on the structure. The electrode units join the conductive layers. Tuning unit for tuning response energy gap of superlattice material, comprises variable magnetic field generators. The superlattice structure produces a photoconductive response to incident electromagnetic radiation of tuned band gap. The superlattice material consists of alternate layers of indium-arsenic and gallium-antimony, of thickness 20-150 Angstrom.    DESCRIPTION OF DRAWING(S) - The figure shows perspective view of detection system.    Superlattice detector (10)