Patent ID: 11863125
Assignee: TOKYO INSTITUTE OF TECHNOLOGY AND
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A producing method of a terahertz oscillator, the producing method comprising steps of:
preparing a substrate structure having four layers including a resonant tunneling diode (RTD) layer as a top layer, an etch stopper layer as a next layer and an n+-InGaAs layer;
forming a mesa at an RTD portion on the RTD layer by a first exposure;
forming an RTD by removing the RTD layer by a first wet etching;
forming an air bridge and stabilizing resistors by removing an etch stopper of the etch stopper layer by a second wet etching;
layering photoresist on a whole surface;
forming a slot antenna by performing a second exposure by using a photomask;
removing the photoresist and the n+-InGaAs layer by a third wet etching; and
producing a terahertz oscillator to oscillate due to a resonance of the RTD and the stabilizing resistors,
wherein the first wet etching and the third wet etching are respectively “H2SO4:H2O2:H2O=1:1:40” at 4 degrees Celsius.