Microfabricated device with tunable spectral emission

An apparatus comprising:

• an array of thermal devices, each thermal device comprising:
• a piezoelectric membrane configured to output light with a spectral feature;
• a metal layer disposed on a surface of the piezoelectric membrane, wherein the metal layer is configured to actuate the piezoelectric membrane to adjust the spectral feature of the light based on a control voltage;
• at least one spacer disposed on the piezoelectric membrane;
• and
• a reflector disposed on an opposite side of the at least one spacer from the piezoelectric membrane;
• and
• one or more processors configured to regulate, for each thermal device, the control voltage applied to the metal layer.

A method comprising:

• disposing a metal layer on a surface of a piezoelectric membrane configured to output a light with a spectral feature;
• disposing at least one spacer extending from the piezoelectric membrane;
• and
• disposing a reflector on an opposite side of the at least one spacer from the piezoelectric membrane,
• wherein the metal layer is configured to, based on a control voltage, actuate the piezoelectric membrane to adjust the spectral feature of the light.