“SON OF A WITCH” • DARK SWAMP BLUES on the Dobro Duolian Resonator Guitar There's something dark and eerie about the tone of this old Dobro Duolian resonator... it always sounds like it was just pulled out of the swamp. I picked it up today, and started a slow rhythm on the bass string, with my foot tapping on a tambourine, and this melody began to snake it's way out. Most of the time when I am writing new songs, all it takes is grabbing the right guitar for the moment, and listening to it until

In this optical ring resonator, light propagates around the loop and remains in the waveguides. How? Due to a phenomenon called total internal reflection. This behavior is ideal for optical filters, notch filters, and other applications that require the blocking of light. To ensure that an optical ring resonator performs as expected, you can use wave optics modeling to evaluate the spectral properties. Get details in this blog post: https://buff.ly/2P9cFiX | COMSOL Multiphysics