InGaAs nano-photodetectors based on photonic crystal waveguide including ultracompact buried heterostructure.
Ultrasmall InGaAs photodetectors based on a photonic crystal waveguide with a buried heterostructure (BH) were demonstrated for the first time. A sufficiently high DC responsivity of ~1 A/W was achieved for the 3.4-μm-long detector. The dynamic response revealed a 3-dB bandwidth of 6 GHz and a 10-Gb/s eye pattern. These results were thanks to the strong confinement of both photons and carriers in a small BH and will pave the way for unprecedented nano-photodetectors with a high quantum efficiency and small capacitance. Our device potentially has an ultrasmall junction capacitance of much less than 1 fF and may enable us to eliminate electrical amplifiers for future optical receivers and subsequent ultralow-power optical links on a chip.
NTT Nanophotonics Center, NTT Corp., 3-1, Morinosato Wakamiya Atsugi, Kanagawa 243-0198, Japan. nozaki.kengo@lab.ntt.co.jp
Kengo
K
Nozaki
Shinji
S
Matsuo
Koji
K
Takeda
Tomonari
T
Sato
Eiichi
E
Kuramochi
Masaya
M
Notomi