Polarization-sensitive near-field investigation of photonic crystal microcavities

Abstract

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Percolating plasmonic networks for light emission control

“…24 Scanning a sub-wavelength SNOM probe over the nanostructure surface gives information on the LDOS map. [25][26][27] These techniques are restricted to small areas of up to few mm 2 , and cannot be easily applied to the large systems we are investigating here. In disordered media, the LDOS is best studied statistically.…”

Scanning near-field optical microscopy of quantum dots in photonic crystal cavities

“…Thus, for cavity QED systems operating in the telecom wavelength range the achievable optical resolution is in the order of 1 m. The typical QD size is in the range of a few nanometers. Likewise, the mode pattern of a PhCC has spatial features well below 1 m [1,2]. Comparing this to the resolution of PL it is evident that the spatial resolution of PL is far from providing the relevant details of the QD-PhC coupling.…”

“…Both modes are displaced to the right side of the cavity center, as compared to the topography (the holes of the PhC are drawn as white circles to guide the eye). We attribute these unexpected features to an asymmetric geometry of the tip [1] and manufacturing imperfections of the PhCC.…”

Far-field emission profiles from L3 photonic crystal cavity modes

“…However, higher order modes can still be important for, e.g., efficient pumping in nanocavity lasers [11], selective excitation of quantum dots embedded within the cavity [12,13], or mutually coupling quantum dots in different spatial positions [14]. Several groups have studied the near-field emission profiles of photonic crystal nanocavities [15,16], even with polarization-resolving imaging [17]. In this paper we report an experimental and theoretical investigation of the spatial far-field profile of the out-ofplane emission for the two lowest-order modes of L3-type PhC nanocavities.…”