The present invention provides a writing technique which can perform high-accuracy overlay writing in electron beam writing equipment performing mark detection by light. Information recorded in the recorded area is reproduced based on the detected end position, so that an accessing inability can be avoided, and the information in the recorded area can correctly be reproduced. Opening of the gate means to an extent sufficient to allow the contents to fall into the dispensing chamber generates a signal from a limit switch indicative that the loading chamber is empty. The plasmonic all-optical switch may operate at an ultrahigh speed just with a small light energy without any electric method, greatly reduce power consumption of an IT device by applying to an all-optical transistor or the like, and increase a processing rate.