The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Excitons and plasmons in nanocrystals strongly interact via Coulomb and electromagnetic fields and this interaction leads to characteristic interference effects which can be observed in optical spectra [1–6]. An interaction between a discrete state of exciton and a continuum of plasmonic states gives rise to Fano-like asymmetric resonances and anti-resonances [2,4]. These interference effects can...
Quantum dot nanocrystals (QD) have been the versatile tool of nanophotonic applications with their size tunable narrow emission spectrum and broad-band excitation characteristics. Compared to the conventional dye molecules, they exhibit a longer lifetime, which makes convenient tools to be employed in nonradiative energy transfer applications. QDs can be utilized for the formation of protein/peptide...
We study non-radiative energy transfer between InGaN quantum wells and colloidal InP nanocrystals separated by sub-10nm distance. A significant non-radiative energy transfer between the two layers is accompanied by reduced surface recombination in InGaN.
Time constants of a resonant energy transfer between Er ions in epitaxial Er2O3 grown on Si(111) are investigated for the coherent manipulation of populations and experimentally estimated to be several microseconds by resonant excitation photoluminescence.
We report flexible tapes of high-performance, top-emitting, quantum dot based, light-emitting diodes (QLEDs) with multicolor emission, actively working even when flexed. The resulting QLED tapes reach a high peak luminance level of 19,265 cd/m2.
Semiconductor nanowires grown via the vapour-liquid-solid (VLS) mechanism are promising for miniaturisation of optoelectronic devices. Efficient optoelectronic devices require these nanowires to have high quantum efficiency. While optimizing the growth process to eliminate bulk defects and achieve perfect surface passivation is one approach to increase the quantum efficiency of nanowires1, coupling...
We report electrically pumped ZnO homojunction random lasers based on nitrogen doped p-type ZnO nanowires and undoped n-type ZnO thin film. The laser devices with and without distributed Bragg reflector are studied.
In this paper we discuss design and optimization specifics of composite IIIV/Si waveguide gratings with 2D sub-micron optical confinement, as applied to DFB lasers. Specifically we calculate the coupling coefficient, measure and compare the theoretical and experimental results.
A smartphone augmented with an optical cradle is demonstrated as a handheld detection instrument for measuring modulation of the resonant wavelength of a photonic crystal biosensor with .009 nm accuracy for point-of-use biomolecular assay applications.
We present a truxene-based distributed feedback laser sensor and demonstrate its sensing capabilities. Results for bulk refractive index sensing, detection of nano-layer adsorption at the laser surface and specific biomolecule sensing are shown.
We present a silicon photonics evanescent sensor for glucose absorption spectroscopy. The important design aspects of this miniature sensor are discussed as well as the experimental challenges. We demonstrate detection of glucose down to 14 mmol/L, close to the physiological range of blood glucose in humans.
We report on a nearly 8-fold increase in multi-hole defect photonic crystal biosensor response by incorporating insitu synthesis of DNA probes, as compared to the conventional functionalization method employing pre-synthesized DNA probe immobilization.
Quantitative digital holographic multi-focus phase contrast microscopy provides various parameters for label-free minimally invasive analysis of living cells. The application for quantification of the impact of drugs and toxins, wound healing assays, tissue density and optical manipulation is demonstrated.
We represent differential interference contrast (DIC) microscopy as a new and simple application for diagnostics of RP. We show the possibility that DIC technique may distinguish the RP disease in vivo.
LED micro-displays offer diverse applications with their superior characteristics and unique performance, particularly in high light utilization efficiency (LUE), design simplicity (Backlight Unit (BLU)-free), long lifetime, and excellent visibility under bright day-light. Several LED based displays have been developed in recent years using both passive matrix (PM) and active matrix (AM) programming...
Blue III-nitride laser diodes are explored as a next-generation light source for solid-state lighting. Laser diodes and light-emitting diodes are compared in the areas of color rendering, efficiency, and economics. Both state-of-the-art and future improved devices are considered.
In summary, we confirmed the improved electrical and optical characteristics, with reduced efficiency droop in InGaN µLED-pillars when these devices were scaled down in size. We demonstrated that strain relief contributed to further improvement in EQE characteristics in small InGaN µLED-pillars (D < 50 µm), apart from the current spreading effect. The µLED-pillar can be deployed as the building...
This invited paper overviews Corning® Willow™ Glass substrates and their enabling of new display and lighting applications, devices, and materials. Specific focus is put on flexible glass' mechanical reliability, R2R processing, and organic electronic devices.
We report efficiency enhancement in quantum dot (QD) based LEDs with the aid of excitonic energy transfer from co-doped TCTA:Ir(ppy)3 layer to CdSe/ZnS QDs while providing spectrally pure emission.
Wire grid polarizer is a well-known optical element with many important applications. We observed a transition from a polarizer (broadband transmission) to a color filter (resonant transmission) of a metallic nano-slit array as the period of the array is increased. The effect is explained in terms of the mode mismatch between the slit waveguide mode and the incident plane wave, which causes light...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.