Optical switch

About: Optical switch is a research topic. Over the lifetime, 28538 publications have been published within this topic receiving 351176 citations.

Method and apparatus providing optical input/output through the back side of an integrated circuit die

Abstract: A method and an apparatus providing optical input/output in an integrated circuit. In one embodiment, optical modulators and demodulators, which are coupled to integrated circuit input/output nodes, are disposed on or within the back side semiconductor substrate of a flip chip packaged integrated circuit. Since a flip chip packaged integrated circuit die is utilized, full access to the optical modulators and demodulators is provided from the back side of the integrated circuit die for optical input/output. In one embodiment, a heat sink including a light source and an optical assembly is thermally and optically coupled to the back side of the integrated circuit die. A light beam is directed to the optical modulators and the deflected modulated light beam is routed and directed to the optical demodulators to realize optical input/output. In one embodiment, infrared light may be utilized such that the optical modulators and demodulators are disposed within a silicon semiconductor substrate. Since silicon is partially transparent to infrared light, optical input/output is realized through the back side and through the semiconductor substrate of the flip chip packaged integrated circuit die.

Ultrafast All-Optical Switching of Germanium-Based Flexible Metaphotonic Devices.

Abstract: Incorporating semiconductors as active media into metamaterials offers opportunities for a wide range of dynamically switchable/tunable, technologically relevant optical functionalities enabled by strong, resonant light-matter interactions within the semiconductor. Here, a germanium-thin-film-based flexible metaphotonic device for ultrafast optical switching of terahertz radiation is experimentally demonstrated. A resonant transmission modulation depth of 90% is achieved, with an ultrafast full recovery time of 17 ps. An observed sub-picosecond decay constant of 670 fs is attributed to the presence of trap-assisted recombination sites in the thermally evaporated germanium film.

Optical transitions in a step quantum well

Abstract: We have theoretically studied the field‐dependent optical properties of a step quantum‐well structure, which consists of a small well inside a big well. The wave functions of the small and big wells overlap and their eigenenergies have different field dependencies. The transition from a small‐well state to a big well state thus gives a large Stark shift at low applied field without degrading the oscillator strength. Another advantage is to allow optical transitions that are forbidden in simple single‐well structures. This relaxation of the selection rule makes it possible to provide optical pumping for intersubband lasing. Also, since the step well is asymmetric, many nonlinear properties are expected.

Dc-to-Dc converters using multi-resonant switches

Abstract: A generalized multi-resonant switch that combines current-mode and voltage-mode resonant switches. Application of the multi-resonant switch in zero-voltage switched multi-resonant converters results in reduction of the voltage stress to the switching transistor, increase of the load range and reduction of the switching frequency bandwidth. Each embodiment of the multi-resonant converter includes a multi-resonant switch having an active switch, a passive switch and reactive components for causing the active and passive switches to operate in a multi-resonant manner.