Papers by Author: Ryszard Jabłoński

Abstract: Further development of dopant-atom-based transistors requires investigation of the effects of discrete dopant distribution on device operation. Hence, it is important to monitor dopants’ arrangement inside transistor channels. We used Kelvin Probe Force Microscope (KPFM) to measure surface potential profiles of field-effect transistor (FET) channels doped with different concentrations of phosphorus atoms. We observed three basic configurations of dopants: solitary donors, “clusters” of a few coupled donors, and “clusters” of many donors. Our systematic observation provides information about the formation of quantum dots consisting of a single donor or a number of coupled donors.

Abstract: The paper presents the synergic application of inertial, force, image and distance sensors for graffiti creation. The complete painting head and software generating picture were designed and realized. Painting head receives impulses and converts them into electric signal transmitted to the computer. Sensors deliver data information about distance, angles and a force applied on the tip of painting head and special algorithm converts this information into created blur shape. The information about angles distorts created blur and information about force increase-decrease, rarefy and thicken the graffiti blur. Painting head resembles spray can.

Abstract: Kelvin Probe Force Microscopy is an attractive technique for characterizing the surface potential of various samples. The main advantage of this technique is its high spatial resolution together with high sensitivity. However as in any nanoscale measurements also in case of KFM it is extremly difficult to describe the uncertainty of the measurement. Moreover, a wide variety of measuring conditions, together with the complicated operation principle cause situation, where no standard calibration methods are available. In the paper we propose the model of the KFM microscope and analyze the uncertainty of the KFM measurement.

Abstract: This paper presents the development of a color calibration method based on spectrally reproduced colors produced by multi-primary color narrow-band LED’s. The additive mixture of the primary colors can spectrally reproduce an object color. This approach has been used in our work to overcome the insufficient calibration results obtained by commonly used color targets such as the Macbeth Chart. The method has been tested using a developed prototype of digitally controlled light source calibrated to simulate object color under D65 Daylight standard illumination. The method allows for obtaining of the average color difference for the calibrated XYZ camera of ∆E=0.79 and shows significant improvement in comparison with calibration using standard Macbeth (∆E=1.47). Moreover, we explain the advantages of color calibration with usage of multi-primary light source with regard to the amount of the primary colors.

Abstract: The paper presents the method, configuration and calibration of special system for measuring the size of particles. It is designed for real-time measurement of particles in the range up to 10µm, moving with velocity up to 15m/s and under pressure up to 20 bar. The method is based on measuring light scattered by single particle. We focused on studying the output from photomultiplier and finding relationships between pulse shape and particle size, and also the time intervals between pulses.

Abstract: Low temperature Kelvin Probe Force Microscopy (LT-KFM) can be used to monitor the electronic potential of individual dopants under an electric field. This capability is demonstrated for silicon-on-insulator field-effect-transistors (SOI-FETs) with a phosphorus-doped channel. We show results of the detection of individual dopants in Si by LT-KFM. Furthermore, we also observe single-electron charging in individual dopants located in the Si channel region.

Abstract: In laser-scanning measurement of cylindrical objects extremely complex interfering signals occur. They are due to superimposition of: reflected, unobstructed and scattered light. The proportions between these components vary in time and also the total intensity distribution changes. The considerations applying Fraunhofer theory are static and fragmentary, and may be concluded that the existing solutions for diffraction of 3D bodies do not fit to engineering applications. Having the above in view, the close analysis of detector signal was carried out. The obtained differential intensity characteristics allow to determine the important metrological qualities of diffraction field.

Abstract: In laser measuring scanners, in addition to the ideal output signal, interfering signals occur. They are due to superimposition of diffracted, reflected, scattered, incident, transmitted and interfering light. The proportions between the mentioned components vary in time and also the total intensity distribution changes. Having the above in view, a close analysis of detector signal was carried out. It was proved that for certain beam parameters the intensity distribution pattern depends on the geometry of object and the real dimension of an object can be calculated by introduction of the size dependent correction.