The present invention relates to an optical device which includes a first laser diode, a beam splitter, a first objective lens, a photo-detector, a second laser diode, a wedged plate beam splitter, a second objective lens and a collimator. Preferably, the method comprises utilizing hierarchical multivariate analysis of spectrometric data at one or more levels of correlation. A first group I having a negative refractive power and a second group II having a positive refractive power are arranged in order from a magnified side toward a reduced side. The insulating layer has VIA 10 which electrically connect the mount-surface-electrodes 5 and the semiconductor-surface-electrodes. Furthermore, this invention concerns the use of the transduction system. The memory operates with a low supply voltage to drive charge, read, and spin currents.