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Nanoslotted microring resonator for high figure of merit refractive index sensing

Yang Daquan, Duan Bing, Zhang Xuan, Lu Hui

Optica Applicata

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2020

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Vol. 50, nr 1

37--47

EN

A nanoslotted microring resonator (NSMR) with enhanced light-matter interaction has been designed, which can be used for high sensitive refractive index sensing. The performance of the device is investigated theoretically based on a three-dimensional finite-difference time-domain (3D-FDTD) method. In order to achieve high figure of merit sensing, the nanoslot geometry is exploited to make the optical field strongly localized inside the low index region and overlap sufficiently with the analytes. By using the 3D-FDTD method, the proposed NSMR sensor device achieves a high Q-factor (Q > 105) and sensitivity ~100 nm/RIU (RIU – refractive index unit). Moreover, the strong light confinement introduced by the nanoslot in NSMR results in the sensor figure of merit as high as 6.73 × 103. Thus, the design we proposed is a promising platform for refractive index-based biochemical sensing and lab-on-a-chip applications.

2

Theoretical and Experimental Analysis of Thermoelectric Power Generation

Ruciński Adam, Rusowicz Artur

Journal of Power Technologies

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2020

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Vol. 100, nr 3

250--254

EN

This paper deals with thermoelectric technology. Selected new semi conductors with improved figures of merit are presented. Peltier modules are used to generate electric current through temperature difference. The paper indicates applications of thermoelectric modules, as interesting tools for various waste heat recovery. There are zero dimension equations describing the conditions of electric power generation including voltage and current with characteristics of the above parameters. The authors are also interested in the efficiency of electric current generation. The experimental stand, on going research and experimental measurements are described. The authors explore the resistance of the receiver placed in the electric circuit with thermoelectric elements. Finally, the experimental results are analyzed and theoretical conclusions made. Voltage generationof about 1.5 to 2.5 V was observed in the range of temperaturę difference ΔT from 65 to 85K. Measurements were taken from a bismuth telluride thermoelectric couple, which is traditionally used in cooling technology.

3

Effect of Sn dopants on the optical and electrical properties of ZnO films

Aksoy S., Caglar Y., Ilican S., Caglar M.

Optica Applicata

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2010

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Vol. 40, nr 1

7--14

EN

The undoped and tin (Sn) doped ZnO films were deposited by a spray pyrolysis method onto the glass substrates. 0.2 M solution of zinc acetate in a mixture of ethanol and deionised water, in a volume proportion of 3 : 1, was employed. Dopant source was tin chloride. The atomic percentage of dopant in solution were Sn/Zn = 1%, 3% and 5%. The effect of tin doping on the optical and electrical properties of ZnO films was studied. The optical transmittance was about 76% in a visible range for Sn-doped ZnO films. The optical band gaps of the films were calculated. This suggests that the absorption edge shifts to the lower wavelengths with Sn dopant. Optical constants of the films were determined. These parameters changed with Sn dopant.