Patent ID: 8514027

Claim:
A terahertz oscillator having the construction comprising two or more structures bonded to each other manufactured by a method of multi-stage substrate etching, the method comprising the steps of: applying an oxide layer onto the first substrate; performing a photoresist-coating onto any one surface of the first substrate applied with the oxide layer, and forming an alignment key pattern on the photoresist-coated surface; forming a first mask pattern on a surface of the first substrate that is opposed to the photo-resist coated surface; and forming a hole by etching the first substrate using the first mask pattern as an etching mask; bonding, to the first substrate, a second substrate having the same thickness as a depth to be etched, the second substrate being bonded to the first substrate on a surface of the first substrate which is opposite the alignment key pattern on the photoresist-coated surface; forming a second mask pattern on the second substrate bonded; forming a hole by etching the second substrate using the second mask pattern as an etching mask; and removing an oxide layer having the etching selectivity between the first substrate and the second substrate.