Light modulator, optical pickup, and light modulation module

摘要

A light modulator (101) includes a waveguide (112) through which guided light propagates, a metal layer (113) formed adjacent to the waveguide (112), a conductive oxide layer (114) having electrical conductivity and formed on a surface of the metal layer (113) which is not adjacent to the waveguide (112), an insulating layer (115) formed adjacent to the conductive oxide layer (114), and a modulation circuit (102) that applies a voltage between the metal layer (113) and one of the conductive oxide layer (114) and the insulating layer (115). An interface (11) at which the conductive oxide layer (114) and the insulating layer (115) are adjacent to each other is formed at a distance shorter than a wavelength of the guided light in vacuum, from the surface of the metal layer (113) which is not adjacent to the waveguide (112).

主权项

1. A light modulator comprising:
a waveguide through which guided light propagates; a metal layer formed adjacent to the waveguide; a conductive oxide layer having electrical conductivity and formed on a surface of the metal layer which is not adjacent to the waveguide; an insulating layer formed adjacent to the conductive oxide layer; and a modulation circuit that applies a voltage between the metal layer and one of the conductive oxide layer and the insulating layer, wherein an interface at which the conductive oxide layer and the insulating layer are adjacent to each other is formed at a distance shorter than a wavelength of the guided light in vacuum, from the surface of the metal layer which is not adjacent to the waveguide.