Optical sensor and modulator

An optical device for use in at least one of modulation of light and sensing an external field, by at least partially exposing the device to an external field, the device comprising:

• a waveguide structure configured to define first and second light channels, each of the first and second channels having a light input and a light output, the first and second channels being optically coupled at their outputs;
• the first channel comprising a first resonating structure which is deformable and has a first resonant wavelength, the second channel comprising a second resonating structure having a second resonant wavelength of a predetermined relation with said first resonant wavelength, light coupled at the outputs of said first and second channels thus presenting a superposition of first and second light components passed through the first and second resonant structures and having a beat frequency and an amplitude, the device thereby allowing exposure of at least the first channel to the external field of the kind affecting a deformation of said at least first resonant structure thus causing a change in at least the first resonant wavelength, resulting in a corresponding change in at least one of said beat frequency and said amplitude parameters of light coupled at the outputs from said first and second channels, said change being indicative of the external field, wherein at least said first channel of the waveguide structure is coupled to a flexing structure configured with a predetermined negative Poisson ratio.