High sensitivity and high Q-factor nanoslotted parallel quadrabeam photonic crystal cavity for real-time and label-free sensing

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Daquan Yang
  • Shota Kita
  • Feng Liang
  • Huiping Tian
  • Yuefeng Ji
  • Marko Lončar
  • Qimin Quan

Detail(s)

Original languageEnglish
Article number063118
Journal / PublicationApplied Physics Letters
Volume105
Issue number6
Publication statusPublished - 11 Aug 2014
Externally publishedYes

Abstract

We experimentally demonstrate a label-free sensor based on nanoslotted parallel quadrabeam photonic crystal cavity (NPQC). The NPQC possesses both high sensitivity and high Q-factor. We achieved sensitivity (S) of 451 nm/refractive index unit and Q-factor >7000 in water at telecom wavelength range, featuring a sensor figure of merit >2000, an order of magnitude improvement over the previous photonic crystal sensors. In addition, we measured the streptavidin-biotin binding affinity and detected 10 ag/mL concentrated streptavidin in the phosphate buffered saline solution.

Citation Format(s)

High sensitivity and high Q-factor nanoslotted parallel quadrabeam photonic crystal cavity for real-time and label-free sensing. / Yang, Daquan; Kita, Shota; Liang, Feng; Wang, Cheng; Tian, Huiping; Ji, Yuefeng; Lončar, Marko; Quan, Qimin.

In: Applied Physics Letters, Vol. 105, No. 6, 063118, 11.08.2014.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review