Bounty Ended with 50 reputation awarded by Mark Omo
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Here's an annotated version of what is what, from my experience laying out GaAs and GaN HEMTs:

enter image description hereenter image description here

You can see the gate finger peeling off of either side of the two gate contacts if you look closely. I can't tell which side is drain, which side is source, but if it's a symmetric device, they aren't any different physically (e.g. a FET designed for switch applications). My guess is that the dashed-line box is the mesa region.

Very cool photo and background :)

Here's an annotated version of what is what, from my experience laying out GaAs and GaN HEMTs:

enter image description here

You can see the gate finger peeling off of either side of the two gate contacts if you look closely. I can't tell which side is drain, which side is source, but if it's a symmetric device, they aren't any different physically (e.g. a FET designed for switch applications).

Very cool photo and background :)

Here's an annotated version of what is what, from my experience laying out GaAs and GaN HEMTs:

enter image description here

You can see the gate finger peeling off of either side of the two gate contacts if you look closely. I can't tell which side is drain, which side is source, but if it's a symmetric device, they aren't any different physically (e.g. a FET designed for switch applications). My guess is that the dashed-line box is the mesa region.

Very cool photo and background :)

1
source | link

Here's an annotated version of what is what, from my experience laying out GaAs and GaN HEMTs:

enter image description here

You can see the gate finger peeling off of either side of the two gate contacts if you look closely. I can't tell which side is drain, which side is source, but if it's a symmetric device, they aren't any different physically (e.g. a FET designed for switch applications).

Very cool photo and background :)