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I've taken an optic fiber, some HF, and vibration-isolated table.
This is what came from putting it all together.
Notice the scale and magnification (um/nm applies to whole scale, not to single segments).
Enjoy



greetings
Adam

About a 1 micron tip. Pretty nice. We used to make points like that. The technique was derived from the Electron microscope needle process. Basically, use a platinum disk with a hole in it and a tungsten wire in a "salt" solution with DC voltage applied. You move the wire in and out of the disk with a hole in it in the solution with the voltage applied.

About a 1 micron tip.

Nope. About 60 nm tip

The technique was derived from the Electron microscope needle process. Basically, use a platinum disk with a hole in it and a tungsten wire in a "salt" solution with DC voltage applied. You move the wire in and out of the disk with a hole in it in the solution with the voltage applied.

I've heard about this process - when the wire breaks the electric circuit is also broken and etching stops, right ?
Is there an electroless version ?
What was the diameter of your tip?

greetings
Adam

I've heard about this process - when the wire breaks the electric circuit is also broken and etching stops, right ?

No, We made a automated "drill press" and had the timing down. Then we would inspect and categorize them to size.

Is there an electroless version ?

Manually grinding but could never come close to electro-etching.

What was the diameter of your tip?

Well, we never had a electron microscope to measure it but we were very near 1um.