adjustment device 710 in its light path the adjustment device 710 can be adjusted to stress or distress the interference path 708 slightly increasing or decreasing the path length the reference light path 706 and the interference path 708 terminate in a second coupler 712 that combines light from the paths the combined light departs through an exit path 714 by using the adjustment device 710 the relative phase angles of light arriving at the second coupler can be adjusted to change the intensity of the light departing through the exit path 714 the adjustment device 710 may be constructed of a compliant material the waveguide then becomes a pressure sensor the adjustment device 710 may be constructed of a material with a refractive index sensitive to electromagnetic fields making the device an antenna the adjustment device 710 may be a gap in the interference path making the device a gas sensor the adjustment device 710 may be a different structure from interference path 708 or may be just a continuation of the interference path for example the interference path 708 may be constructed entirely of compliant materials making the path inherently a pressure sensor fig8 shows the waveguide of the present invention used as a light modulator a first coupler 802 splits light from an entry path 804 into a first beam that travels through a reference light path 806 and a second beam that travels through a refraction path 808 both light paths are photonic waveguides identical in structure to waveguide 102 they also feature alternating pillars 202 204 of material that form.