Narrow band emitter devices

Claim 1

AN ELECTRICAL APPARATUS COMPRISING A THIN DIELECTRIC FILM, A FIRST MEMBER BONDED TO ONE SIDE OF SAID FILM, AND A SECOND MEMBER BONDED TO THE OTHER SIDE OF SAID FILM, SAID FIRST MEMBER BEING OF A MATERIAL HAVING A NARROW CONDUCTIVE ENERGY BAND LOCATED ABOVE A SUBSTANTIALLY WIDER FORBIDDEN ENERGY GAP, SAID SECOND MEMBER BEING A THIN FILM OF METALLIC MATERIAL HAVING A THICKNESS IN THE ORDER OF THE MEAN FREE PATH OF AN ELECTRON THEREIN AND HAVING AN EXTERNAL WORK FUNCTION PREVENTING THE ESCAPE OF ELECTRONS FROM THE LOWER UNOCCUPIED ENERGY LEVELS, A SOURCE OF OPERATING VOLTAGE FOR ESTABLISHING AN OPERATING POTENTIAL BETWEEN SAID FIRST AND SECOND MEMBERS ACROSS SAID THIN DIELECTRIC FILM, AND SAID DIELECTRIC FILM HAVING A THICKNESS PERMITTING APPRECIABLE QUANTUM MECHANICAL TUNNELING OF ELECTRONS FROM SAID FIST MEMBER THROUGH THE DIELECTRIC FILM INTO SAID SECOND MEMBER ONLY WHEN THE AMPLITUDE OF AN OPERATING POTENTIAL ESTABLISHES THE POTENTIAL OF THE OCCUPIED ENERGY LEVELS OF THE NARROW CONDUCTIVE ENERGY BAND OF SAID FIRST MEMBER SUBSTANTIALLY AT OR ABOVE THE POTENTIAL LEVEL OF THE WORK FUNCTION OF SAID SECOND MEMBER.