A waveguide with localized optical alterations diffractively focuses light into a compact structure.
A thermally-assisted magnetic recording head uses a variable gap between the magnetic pole and near-field optical device.
Embedded heater generates preheat and steering heat to stabilize laser temperature, reducing mode hopping and data errors during write operations.
A multilayered waveguide structure with varying refractive indices stabilizes the light-emitting spot center position.