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The influence of coating fabrication processes on the optical efficiency of replicated Moiré diffraction gratings

100%

Ribeiro J. E.

Metrology and Measurement Systems

2013

tom Vol. 20, nr 1

119-126

One of the most important parameters in the study of diffraction gratings is their optical efficiency. This paper analyzes the different manufacturing processes to cover gratings of Moiré interferometry and their influence on the quality and absolute efficiency of replicated gratings on the surfaces of specimens. The Moiré interferometry is a field measurement technique that has been used in many different fields such as applied mechanics, microelectronics, biomechanics or micromechanics, hence the importance of this study. The applied reflected coating was done by sputtering and aluminium vaporization processes. In this work different materials and thickness layers were analyzed. The obtained coatings have a high degree of reflectivity on the replicated gratings.

Czynniki wpływające na efektywność kolektorów słonecznych

63%

Trząski A.

Materiały Budowlane

2014

tom nr 6

30--32

Evaluation of optical quality and properties of Ga₀.₆₄In₀.₃₆N₀.₀₀₆As₀.₉₉₄ lattice matched to GaAs by using photoluminescence spectroscopy

63%

Gholami M. , Esmaeili M. , Haratizadeh H. , Holtz P. O. , Hammar M.

Opto-Electronics Review

2009

tom Vol. 17, No. 3

260-264

We have investigated optical properties of Ga₀.₆₄In₀.₃₆N₀.₀₀₆As₀.₉₉₄GaAs single quantum-well structures using photoluminescence technique. We have found that nitrogen creates potential fluctuations in the InGaNAs structures, so it is the cause of trap centres in these structures and leads to localized excitons recombination dynamics. The near-band edge PL at 2 K exhibited a blueshift with an increase in excitation intensity of a sample but there is not such a shift in the PL peak position energy of same sample at 150 K. It has been found that PL spectra have a large full width at half maximum (FWHM) value at 2 K. These results are discussed in terms of carrier localization. Additionally, our results suggest decreasing PL integrated intensity in this structure, possibly due to non-radiative recombination. It has been shown that thermal annealing reduces the local strain created by nitrogen. By annealing process, a blue shifted emission can be observed.