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Ultrafast All‐Optical Switching of Germanium‐Based Flexible Metaphotonic Devices
Author(s) -
Lim Wen Xiang,
Manjappa Manukumara,
Srivastava Yogesh Kumar,
Cong Longqing,
Kumar Abhishek,
MacDonald Kevin F.,
Singh Ranjan
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201705331
Subject(s) - materials science , ultrashort pulse , germanium , picosecond , optoelectronics , semiconductor , terahertz radiation , optical switch , optics , laser , silicon , physics
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.