[0] https://www.google.com/search?q=solid+state+microwave+oven
But, in the wrong hands, that's a directed-energy weapon, isn't it? (Hell, stick one of these in the right kind of tube and you've now got a coherent RF beam—a maser pointer. You could probably burn your name into a wooden building from across a football field with one.)
Thinking of that book, I don't think it's likely that libraries would carry that kind of book any more, sadly.
http://www.amazon.com/Build-Laser-Phaser-Working-Projects/dp...
Looking at NXP's "RF Cooking" page, it appears they're pushing this stuff with some optimism... (http://www.nxp.com/video/sage-freescales-vision-of-an-intell...)