title: Microcavity-Integrated Carbon Nanotube Photodetectors.
abstract: Carbon nanotubes (CNTs) are considered to be highly promising nanomaterials for multiwavelength, room-temperature infrared detection applications. Here, we demonstrate a single-tube diode photodetector monolithically integrated with a Fabry-Pérot microcavity. A ∼6-fold enhanced optical absorption can be achieved, because of the confined effect of the designed optical mode. Furthermore, taking advantage of Van-Hove-singularity band structures in CNTs, we open the possibility of developing chirality-specific (n,m) CNT-film-based signal detectors. Utilizing a concept of the "resonance and off-resonance" cavity, we achieved cavity-integrated chirality-sorted CNT-film detectors working at zero bias and resonance-allowed mode, for specific target signal detection. The detectors exhibited a higher suppression ratio until a power density of 0.07 W cm(-2) and photocurrent of 5 pA, and the spectral full width at half-maximum is ∼33 nm at a signal wavelength of 1200 nm. Further, with multiple array detectors aiming at different target signals integrated on a chip, a multiwavelength signal detector system can be expected to have applications in the fields of monitoring, biosensing, color imaging, signal capture, and on-chip or space information transfers. The approach can also bring other nanomaterials into on-chip or information optoelectronics, regardless of the available doping polarity.
authors.forename: Shuang
authors.initials: S
authors.lastname: Liang
authors.forename: Ze
authors.initials: Z
authors.lastname: Ma
authors.forename: Gongtao
authors.initials: G
authors.lastname: Wu
authors.forename: Nan
authors.initials: N
authors.lastname: Wei
authors.forename: Le
authors.initials: L
authors.lastname: Huang
authors.forename: Huixin
authors.initials: H
authors.lastname: Huang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter , Beijing 100190, China.
authors.forename: Huaping
authors.initials: H
authors.lastname: Liu
authors.forename: Sheng
authors.initials: S
authors.lastname: Wang
authors.forename: Lian-Mao
authors.initials: LM
authors.lastname: Peng
keywords: Schottky barrier; carbon nanotube; microcavity; photocurrent; photodetector