Method for making T type grating through combination of X-ray etching and optical etching
An X-ray and lithography technology, which is used in the field of mixing X-ray lithography and optical lithography to make T-shaped gratings, can solve the problems that the electron beam time cannot be adapted to large-scale production, and the electron beam lithography is complicated.
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[0026] Such as diagram 2-1 As shown, first coat the underlying X-ray photoresist 202 on the PHEMT or MESFET chip 201, the thickness of the photoresist is between 150-300nm, and the photoresist 202 can be PMMA or ZEP 520 or UVIII.
[0027] Such as Figure 2-2 As shown, the X-ray lithography method exposes the underlying X-ray photoresist 202 .
[0028] Such as Figure 2-3 As shown, the top layer of optical photoresist 203 is coated. The optical photoresist can be S9912 or I-line adhesive, and the thickness of the adhesive is 1000-1500 nm.
[0029] Such as Figure 2-4 As shown, the photolithography method exposes the top photoresist, and develops the top photoresist to obtain the wide gate pattern 204 .
[0030] Such as Figure 2-5 As shown, develop the underlying X-ray photoresist to obtain the gate groove pattern 205, use oxygen plasma to prime the glue for 40 seconds, and the oxygen flow rate is 20 sccm, then soak in phosphoric acid: deionized water=1:10 for 50 seconds,...
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