Abstract: A thermal sensor, a thermal sensor array, an electronic apparatus including the thermal sensor, and an operating method of the thermal sensor are provided. The thermal sensor includes a first region onto which first infrared light is incident, a visible light radiation region configured to radiate visible light generated by incidence of the first infrared light on the first region, a second region onto which second infrared light is incident, and an image sensor configured to receive the visible light radiated from the visible light radiation region. The first region, the second region, and the visible light radiation region each include a nonlinear optical material.

Abstract: An infrared detector includes a substrate in which a void is formed, a micro-resonator suspended over the void, an infrared absorber on an upper surface of the micro-resonator, a thermal isolation bridge supporting the micro-resonator, a first waveguide optically coupled with the micro-resonator, a second waveguide intersecting the first waveguide and optically coupled with the micro-resonator, a light source optically coupled with the first waveguide, and a photodetector optically coupled with the second waveguide.