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Title: Single-nanoparticle detection with slot-mode photonic crystal cavities

Optical cavities that are capable for detecting single nanoparticles could lead to great progress in early stage disease diagnostics and the study of biological interactions on the single-molecule level. In particular, photonic crystal (PhC) cavities are excellent platforms for label-free single-nanoparticle detection, owing to their high quality (Q) factors and wavelength-scale modal volumes. Here, we demonstrate the design and fabrication of a high-Q (>10{sup 4}) slot-mode PhC nanobeam cavity, which is able to strongly confine light in the slotted regions. The enhanced light-matter interaction results in an order of magnitude improvement in both refractive index sensitivity (439 nm/RIU) and single-nanoparticle sensitivity compared with conventional dielectric-mode PhC cavities. Detection of single polystyrene nanoparticles with radii of 20 nm and 30 nm is demonstrated in aqueous environments (D{sub 2}O), without additional laser and temperature stabilization techniques.
Authors:
; ;  [1] ;  [2] ;  [1] ;  [3]
  1. School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 (United States)
  2. Rowland Institute at Harvard University, Cambridge, Massachusetts 02142 (United States)
  3. (China)
Publication Date:
OSTI Identifier:
22483106
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 26; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPARATIVE EVALUATIONS; CRYSTALS; DESIGN; DETECTION; DIELECTRIC MATERIALS; DISEASES; FABRICATION; HEAVY WATER; LASERS; MOLECULES; NANOPARTICLES; POLYSTYRENE; REFRACTIVE INDEX; SENSITIVITY