In one general aspect, a computer-readable storage medium can store instructions that when executed cause a computing device to perform a process. The device includes a cannula and a hub. The quick release includes an operator having a handle portion and a stem portion. The second receive path includes fewer configuration switches than the first receive path and is selectively configured to supply the amplified second signals to the receiver via the second antenna, the second low noise amplifier, and the second configuration switch. The second polarization grating is configured to analyze and diffract the first and second beams from the liquid crystal layer to alter the different directions of propagation thereof in response to the state of the liquid crystal layer.