There are applications where silicon photonics outperforms semiconductor electronics. Imagine the performance you could get out of similarly sized optical gates.
Yes, you are right. I didn't know that current tech is using 1550nm light. Wouldn't want to imagine the heat coming off the optical CPU using 2nm light. Yikes.
It's not about heat, it's about rays like that penetrating your receiver instead of setting up a field. It would also give 'side channel attack' a whole new meaning.
There are startups out of MIT like Ayer labs using 30 nm node tech to make grating couplers, but fundamentally if you are using light with a wavelength of 1500 nm, there is a limitation in how much it could possibly matter to go to single digit nms due to the nature of light.
Imagination isn't what drives this, materials science is. This comparison as far as I can see is utterly meaningless, it is about as apples-to-oranges as it gets.
