Ultrafast All-Optical Switching of Germanium-Based Flexible Metaphotonic Devices.
basic_science · Level V
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- Record sourced from PubMed, PMID 29327454.
- Also identified by DOI 10.1002/adma.201705331.
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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.