نتایج جستجو برای: qd lasers
تعداد نتایج: 26741 فیلتر نتایج به سال:
مقدمه: سرطان تخمدان رایج ترین علت مرگ و میر ناشی از سرطان دستگاه ژنیتال و پنجمین علت مرگ و میر ناشی از سرطان در خانمها می باشد. این سرطان معمولاً تا مراحل پیشرفته بیماری تشخیص داده نمی شود و به همین دلیل میزان بقاء در بیماران مبتلا به نحو قابل توجهی پائین است. یکی از شناخته شده ترین تومورمارکرهای سرطان تخمدان، مولکول هیپرگلیکوزیله ca 125 است که بیان آن در سرطان تخمدان افزایش یافته و به عنوان یک ...
Quantum dot (QD) labeling combined with fluorescence lifetime imaging microscopy is proposed as a powerful transduction technique for the detection of DNA hybridization events. Fluorescence lifetime analysis of DNA microarray spots of hybridized QD labeled target indicated a characteristic lifetime value of 18.8 ns, compared to 13.3 ns obtained for spots of free QD solution, revealing that QD l...
A homodyne measurement technique is demonstrated that enables direct observation of the coherence and phase of light that passed through a coupled quantum dot (QD)-microcavity system, which in turn enables clear identification of coherent and incoherent QD transitions. As an example, we study the effect of power-induced decoherence, where the QD transition saturates and incoherent emission from...
We combine optical absorption spectroscopy, ex situ transmission electron microscopy (TEM) imaging, and variable-temperature measurements to study the effect of ultraviolet (UV) light and heat treatments on ethanedithiol-treated PbS quantum dot (QD) films as a function of ambient atmosphere, temperature, and QD size. Film aging occurs mainly by oxidation or ripening and sintering depending on Q...
Let f be a binary string and d C 1. Then the generalized Lucas cube Qd(JÐf ) is introduced as the graph obtained from the d-cube Qd by removing all vertices that have a circulation containing f as a substring. The question for which f and d, the generalized Lucas cube Qd(JÐf ) is an isometric subgraph of the d-cube Qd is solved for all binary strings of length at most five. Several isometricall...
Carbon disulfide, a potentially therapeutic small molecule, is generated via oxidative cleavage of 1,1-dithiooxalate (DTO) photosensitized by CdSe quantum dots (QDs). Irradiation of DTO-QD conjugates leads to λ(irr) independent photooxidation with a quantum yield of ~4% in aerated pH 9 buffer solution that drops sharply in deaerated solution. Excess DTO is similarly decomposed, indicating labil...
این پایان نامه به تشریح روش های بهبود در عملکرد qd-vcsoa از جمله سرعت بخشیدن به فرآیند بازیابی بهره و فاز و همچنین افزایش پهنای باند بهره می پردازد. نیاز به ارتباطات سریع تر، دائماً رو به افزایش است. بنابراین، شمار زیادی از پژوهش های مرتبط با تقویت کننده های نوری نیمه هادی، به موضوع زمان بازیابی بهره اختصاص یافته است. این مشخصه ی زمانی، به خصوص در نرخ بیت های زیاد اهمیت زیادی دارد. برای اولین ب...
One of the biggest challenges of nanotechnology is the fabrication of nano-objects with perfectly controlled properties. Here we employ a focused laser beam both to characterize and to in-situ modify single semiconductor structures by heating them from cryogenic to high temperatures. The heat treatment allows us to blue-shift, in a broad range and with resolution-limited accuracy, the quantized...
We demonstrate exciton energy transfer from a thin film of phosphorescent dye fac tris(2-phenylpyridine) iridium (Ir(ppy)3) to a monolayer of colloidal CdSe/ZnS core/shell quantum dots (QDs). The energy transfer is manifested in time-resolved photoluminescence (PL) measurements as elongation of the QD PL time constant from 40 to 400 ns, and a concomitant 55% increase of time-integrated QD PL in...
– A potential scheme is proposed for realizing a two-qubit quantum gate in semiconductor quantum dots. Information is encoded in the spin degrees of freedom of one excess conduction electron of each quantum dot. We propose to use two lasers, radiating two neighboring QDs, and tuned to blue detuning with respect to the resonant frequencies of individual excitons. The two-qubit phase gate can be ...
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