Abstract:
A monolithic wavelength stabilized system comprises a laser monolithically formed with a waveguide splitter having at least two branches. Non-identical resonators having different wavelengths are operatively coupled to each branch of the splitter and a photodiode is communicatively coupled to receive the output from each non-identical resonator. A control unit receives the photocurrent outputs from the photodiodes, determines based on the photocurrents whether the wavelength of the laser signal is at a desired value, and transmits a feedback signal to the laser to move the laser output toward the desired wavelength. The laser, splitter, resonators, and photodiodes are monolithically formed in a single chip using asymmetric waveguides.
Abstract:
A device is provided, having a first electrode, a second electrode, and a photoactive region disposed between the first electrode and the second electrode. The photoactive region includes a first organic layer comprising a mixture of an organic acceptor material and an organic donor material, wherein the first organic layer has a thickness not greater than 0.8 characteristic transport lengths, and a second organic layer in direct contact with the first organic layer, wherein: the second organic layer comprises an unmixed layer of the organic acceptor material or the organic donor material of the first organic layer, and the second organic layer has a thickness not less than about 0.1 optical absorption lengths. Preferably, the first organic layer has a thickness not greater than 0.3 characteristic transport lengths. Preferably, the second organic layer has a thickness of not less than about 0.2 optical absorption lengths. Embodiments of the invention can be capable of power efficiencies of 2% or greater, and preferably 5% or greater.
Abstract:
A device is provided, having a first electrode, a second electrode, and a photoactive region disposed between the first electrode and the second electrode. The photoactive region includes a first organic layer comprising a mixture of an organic acceptor material and an organic donor material, wherein the first organic layer has a thickness not greater than 0.8 characteristic charge transport lengths, and a second organic layer in direct contact with the first organic layer, wherein: the second organic layer comprises an unmixed layer of the organic acceptor material or the organic donor material of the first organic layer, and the second organic layer has a thickness not less than about 0.1 optical absorption lengths. Preferably, the first organic layer has a thickness not greater than 0.3 characteristic charge transport lengths. Preferably, the second organic layer has a thickness of not less than about 0.2 optical absorption lengths. Embodiments of the invention can be capable of power efficiencies of 2% or greater, and preferably 5% or greater.
Abstract:
Embodiments of the present invention are directed to low complexity, efficient, two-component memory elements for use in low-cost, robust, and reliable WORM memories. The memory element of one embodiment is an organic-on-inorganic heterojunction diode comprising an organic-polymer layer joined to a doped, inorganic semiconductor layer. The organic polymer layer serves both as one later of a two-later, semiconductor-based diode, as well as a fuse. Application of a voltage greater than a threshold WRITE voltage for a period of time greater than a threshold time interval for a WRITE-voltage pulse irreversibly and dramatically increases the resistivity of the organic polymer layer. The memory element that represents one embodiment of the present invention is more easily manufactured than previously described, separate-fuse-and-diode memory elements, and has the desirable characteristics of being switchable at lower voltages and with significantly shorter-duration WRITE-voltage pulses than the previously described memory elements.
Abstract:
A polarization insensitive semiconductor optical amplifier (SOA) is provided. The SOA includes an active waveguide, a passive waveguide, and a taper coupler for coupling optical energy from the passive waveguide into the active waveguide, wherein the taper coupler has width W varying relative to position along a main axis z of propagation of the SOA in proportion to the minimum value of 1/CTE 01 (z) 1/CTM 01 (z), where CTE 01 (z) represents the coefficient of energy coupling between a fundamental mode and a first order mode for the transverse electric polarization as a function of the position z, and CTM 01 (z) represents the coefficient of energy coupling between a fundamental mode and a first order mode for the transverse magnetic polarization as a function of the position z.
Abstract translation:提供了偏振不敏感半导体光放大器(SOA)。 SOA包括有源波导,无源波导和锥形耦合器,用于将来自无源波导的光能耦合到有源波导中,其中锥形耦合器具有相对于沿着SOA的传播主轴线z的位置而变化的宽度W (z)1 / C TM 01(z)的最小值的比例,其中C TE 01(z) )表示作为位置z的函数的横向电极化的基模和一阶模式之间的能量耦合系数,并且C 1(z)表示 作为位置z的函数的横向磁极化的基本模式和一阶模式。
Abstract:
The invention provides a method of depositing a layer of a conductive material, e.g. metal, metal oxide or electroconductive polymer, from a patterned stamp, preferably a soft, elastomeric stamp, to a substrate after an organic layer has been transferred from a patterned stamp to an organic layer over the substrate. The patterned metal or organic layer may be used for example, in a wide range of electronic devices. The present methods are particularly suitable for nanoscale patterning of organic electronic components.
Abstract:
Organic light emitting devices are Disclosed which are comprised of a heterostructure for producing electroluminescence wherein the heterostructure is comprised of an emissive layer containing a phosphorescent dopant compound. For example, the phosphorescent dopant compound may be comprised of platinum octaethylporphine (PtOEP), which is a compound having the chemical structure with the formula:
Abstract:
The present invention relates to a method and system for controlling electrodeposition of a deposition entity in which a solution or suspension of the deposition entity is provided between a pair of superposed electrodes at a predetermined concentration. A potential is applied to the electrodes sufficient to cause migration of the deposition entity to one of the electrodes and deposition of a controlled thickness of the deposition entity. The distance between the electrodes and voltage applied can be controlled to provide migration of the deposition entity. The method and system provide controlled immobilization of deposition entities such as proteins, enzymes, light harvesting complexes, DNA, RNA, PNA onto a substrate without loss of function. In one embodiment, the system can be used on a nanoscale. Additionally, devices can be formed by the method of the present invention.
Abstract:
Organic light emitting devices are disclosed which are comprised of a heterostructure for producing electroluminescence wherein the heterostructure is comprised of an emissive layer containing a phosphorescent dopant compound. For example, the phosphorescent dopant compound may be comprised of platinum octaethylporphine (PtOEP), which is a compound having the chemical structure with the formula:
Abstract:
The present invention is directed to organic light emitting devices comprised of a heterostructure for producing electroluminescence, wherein the heterostructure includes a hole injection enhancement layer between a hole transporting layer and an indium tin oxide anode layer. The hole injection enhancement layer may be comprised of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA), bis(1,2,5-thiadiazolo)-p-quinobis(1,3-dithiole) (BTQBT), or other suitable, rigid organic materials. The present invention is further directed to methods of fabricating such devices.