US 12,461,401 B2
Optical device and optical system
Tetsuya Shibata, Tokyo (JP); Hideaki Fukuzawa, Tokyo (JP); Takashi Kikukawa, Tokyo (JP); and Tomohito Mizuno, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Mar. 15, 2022, as Appl. No. 17/694,917.
Claims priority of application No. 2021-056795 (JP), filed on Mar. 30, 2021; and application No. 2021-206036 (JP), filed on Dec. 20, 2021.
Prior Publication US 2022/0317484 A1, Oct. 6, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G02F 1/05 (2006.01); H01S 5/00 (2006.01)
CPC G02F 1/0508 (2013.01) [G02F 1/0516 (2013.01); H01S 5/0085 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An optical device comprising:
at least one magnetic element including a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer;
a control circuit;
a substrate; and
a waveguide,
wherein the waveguide and the magnetic element are located on or above the substrate,
at least some of light propagating in the waveguide is applied to the magnetic element, and
the magnetic element is a magnetic tunnel junction element,
the magnetic tunnel junction element outputs a voltage or a current in accordance with an intensity of the light applied thereto, and
the control circuit receives an electric signal from the magnetic tunnel junction element, and outputs an output signal to another circuit, based on the electric signal.