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The brightness, large absorption cross-section and flexibility of colloidal nanocrystal quantum-dots (QDs) make these materials promising candidates for light harvesting applications. The difficulty of efficiently extracting photogenerated carriers from the QDs however drastically limits the power conversion efficiency of NQD solar cells. A possible way to circumvent these issues is to engineer hybrid...
We present experimental proof of principle for all-optical excitonic routers and all-optical excitonic transistors with a high ratio between the excitonic signal at the optical drain and the excitonic signal due to the optical gate.
We implement a simple and fast technique to detect spectral shifts in the light scattering of gold nanoparticles due to refractive index changes of the surrounding medium. Spectral shifts are detected using spectrally balanced photon counting from the scattering spectrum of colloidal gold nanoparticles. We demonstrate the use of this technique for sensing ethanol concentration down to 0.1M.
Single-mode lasing at ∼628 nm above an absorbed pump power threshold of 67.5 μW, tunable within a 2.1-nm range (30% of the free-spectral-range) was obtained from colloidal CdSe/CdS core/shell nanorods on whispering-gallery-mode silica microspheres.
Gold nanoparticles (GPs) are employed as versatile labels for the optical detection of chemical or bio-recognition events by monitoring local and surrounding Refractive Index (RI)[1,2]. The change of RI affects GPs localized surface plasmon resonance spectra (LSPR), depending on the size and shape of the individual particles [3].
Colloidal semiconductor quantum rods (nanorods) exhibit size tunable absorption and emission spectra with a high oscillator strength in combination with the emission of linearly polarised light [1]. The emission of light polarised along the long axis of the nanorod has been observed on the single particle level, where an individual nanorod can serve as a single photon source [2]. The optical properties...
A biosensor which takes advantage of surface stress changes during biological interactions and is able to translate them into a capacitive signal is presented. The sensor consists of an ultrathin silicon membrane on which receptor molecules are immobilized. During biomolecular interactions, the surface stress changes and the membrane deflects resulting in a change in device capacitance. The biosensor...
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