A reflective fishing-light-and-heater bracket has a base plate that is designedly rectangular and made to rest on a gunwale of a boat for supporting a gas light and a reflector. Embodiments include removing up to 60 of silicon oxide by immersing the wafer in an acidic solution, such as a solution of hydrofluoric acid and water. A gap is defined between the first and second channels that allows propagation along a waveguide axis of electromagnetic waves in a TE n,0 mode, wherein n is an odd number, but suppresses electromagnetic waves in a TE m,0 mode, wherein m is an even number.