Resonator optimisation

A device comprising:

• a substrate;
• a plurality of resonators on the substrate, each of the resonators of the plurality of resonators being resonant at a predetermined wavelength of electromagnetic radiation and at least some of the resonators being arranged to operate in different resonance orders;
• and
• a waveguide on the substrate, the waveguide being coupled to the plurality of resonators for guiding electromagnetic radiation to the plurality of resonators, wherein a resonance order of each resonator along the waveguide is selected to provide a maximum coupling of light into the resonators.

A method of configuring a device having a substrate, a plurality of resonators on the substrate, each of the plurality of resonators being resonant at a predetermined wavelength of electromagnetic radiation, and a waveguide on the substrate, the waveguide being coupled to the plurality of resonators for guiding the electromagnetic radiation to the plurality of resonators, the method comprising:

• selecting predetermined wavelengths of interest;
• determining a target wavelength for each resonator from the wavelengths of interest;
• and
• determining a resonance order of each resonator of the plurality of resonators such that the resonant wavelength of the resonator falls at the target wavelength for that resonator and such that resonance depth is increased, a resonance order of at least one resonator being different than a resonance order of at least one other resonator of the plurality of resonators.