Experimental study of near-field light collection efficiency of aperture fiber probe at near-infrared wavelengths

Nobuhiro Tsumori; Motoki Takahashi; Yoshiki Sakuma; Toshiharu Saiki

doi:10.1364/AO.50.005710

Experimental study of near-field light collection efficiency of aperture fiber probe at near-infrared wavelengths

Appl Opt. 2011 Oct 10;50(29):5710-3. doi: 10.1364/AO.50.005710.

Authors

Nobuhiro Tsumori¹, Motoki Takahashi, Yoshiki Sakuma, Toshiharu Saiki

Affiliation

¹ Graduate school of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa 228-8522, Japan. tsumori@saiki.elec.keio.ac.jp

PMID: 22015365
DOI: 10.1364/AO.50.005710

Abstract

We examined the near-field collection efficiency of near-infrared radiation for an aperture probe. We used InAs quantum dots as ideal point light sources with emission wavelengths ranging from 1.1 to 1.6 μm. We experimentally investigated the wavelength dependence of the collection efficiency and compared the results with computational simulations that modeled the actual probe structure. The observed degradation in the collection efficiency is attributed to the cutoff characteristics of the gold-clad tapered waveguide, which approaches an ideal conductor at near-infrared wavelengths.