Friday, May 29, 2020

Fingerprints in the Optical and Transport Properties of Quantum Dots Book PDF Free download



In recent few years, broadband light sources around 1m have received considerable attention for their use in medical imaging technologies. It is due to the optimal compromise between water absorption and human tissue scattering that the 1000-1100 nm wavelength range has been proposed, and demonstrated, to be more suitable for OCT applications as compared to those that use a light source with a central wavelength of 800nm (Pavazay et al, 4 Fingerprints in the Optical and Transport Properties of Quantum Dots 2003; Pavazay et al, 2007). There are a myriad of choices in selecting such OCT light sources i) femtosecond or fiber lasers that are dispersed to produce super-continuum light and swept source lasers (Hartl et al, 2001; Wang et al, 2003), ii) thermal sources, and iii) superluminescent diodes (Sun et al, 1999; Liu et al, 2005; Lv et al, 2008; Haffouz et al, 2010). Although the reported OCT tomograms with the highest axial resolution (1.8m) were so far achieved in research laboratories with a photonic crystal fibre based source (Wang et al, 2003), superluminescent diodes are considerably lower in cost and complexity as well as being smaller in size, which makes them more attractive for mass production. Superluminescent diodes utilizing quantum-dots (QDs) in the active region are considered to be excellent candidates as light source for an OCT systems. The naturally wide dimensional fluctuations of the self-assembled quantum dots, grown by the StranskiKrastanow mode, are very beneficial for broadening the gain spectra which enhances the spectral width of the SLDs. On the other hand, the three-dimensional carrier confinement provided by the dots’ shape results in high radiative efficiency required for the OCT applications.


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Fingerprints in the Optical and Transport Properties of Quantum Dots Book PDF Free download


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