Disclosed is the device for adding and dropping optical signals using a bulk dielectric optical thin film and four lens elements. The memory circuitry may include memory cell transistors and associated pass transistors. The magnetic coil is periodically connected and disconnected from a DC power supply in response to a series of drive pulses having a timing and duration such that the magnetic forces generated by the interaction of the permanent magnet and the electromagnetic coil maintains resonant oscillations of the device.