Light modulating device and electronic apparatus using the same

A light modulating device comprising:

• a plurality of modulation elements that are spaced apart from each other at a regular interval, in a first direction,
• wherein each of the plurality of modulation elements comprises:
• a first semiconductor layer having a grating pattern and doped with a first type of dopant;
• a second semiconductor layer doped with a second type of dopant;
• and
• a quantum well layer that has a multiple quantum well structure and a refractive index that is variable according to a voltage applied thereto, the quantum well layer being provided between the first semiconductor layer and the second semiconductor layer in a second direction that is perpendicular to the first direction, and
• at least one voltage source configured to individually apply a voltage signal between the first semiconductor layer and the second semiconductor layer of each of the plurality of modulation elements,
• wherein the second semiconductor layer comprises a plurality of protruding elements extending in the second direction and on which the quantum well layer and the first semiconductor layer are provided, the plurality of protruding elements corresponding to the grating pattern, and
• wherein, in the second direction, a thickness of each of the plurality of protruding elements is greater than a thickness of the quantum well layer and a thickness of the first semiconductor layer.