T
Takasumi Tanabe
Researcher at Keio University
Publications - 280
Citations - 6780
Takasumi Tanabe is an academic researcher from Keio University. The author has contributed to research in topics: Photonic crystal & Silicon photonics. The author has an hindex of 32, co-authored 262 publications receiving 6137 citations. Previous affiliations of Takasumi Tanabe include Nippon Telegraph and Telephone.
Papers
More filters
Journal ArticleDOI
Sub-femtojoule all-optical switching using a photonic-crystal nanocavity
Kengo Nozaki,Takasumi Tanabe,Akihiko Shinya,Shinji Matsuo,Tomonari Sato,Hideaki Taniyama,Masaya Notomi +6 more
TL;DR: In this article, a combination of an ultrasmall photonic-crystal nanocavity and strong carrier-induced nonlinearity in InGaAsP was used to demonstrate low-energy switching within a few tens of picoseconds.
Journal ArticleDOI
Ultrahigh-Q photonic crystal nanocavities realized by the local width modulation of a line defect
Eiichi Kuramochi,Masaya Notomi,Satoshi Mitsugi,Akihiko Shinya,Takasumi Tanabe,Toshifumi Watanabe +5 more
TL;DR: In this article, the authors proposed an ultrahigh quality factor (Q) photonic crystal slab nanocavity created by the local width modulation of a line defect, which has an intrinsic Q value of up to 7×107.
Journal ArticleDOI
Optical bistable switching action of Si high-Q photonic-crystal nanocavities
TL;DR: All-optical bistable switching operation of resonant-tunnelling devices with ultra-small high-Q Si photonic-crystal nanocavities with potentials to function as various signal processing functions in photonic andcrystal-based optical-circuits are demonstrated.
Journal ArticleDOI
Large-scale arrays of ultrahigh-Q coupled nanocavities
TL;DR: In this paper, an array of more than 100 coupled optical resonators has been demonstrated using a photonic crystal, which can slow light down to below 1% of its speed in a vacuum.
Journal ArticleDOI
Trapping and delaying photons for one nanosecond in an ultrasmall high-Q photonic-crystal nanocavity
TL;DR: In this paper, the authors describe time-domain measurements on photonic-crystal cavities with the highest Q among wavelength-scale cavities, and show directly that photons are trapped for one nanosecond.