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In this book, Transfer matrix method theory of the DBR optical multilayer and calculation on reflectivity and transmissivity will be presented. Using Matlab programs to simulate and analize of the microcavity for UV Light enhancement and study the effects of variation of certain parameters on DBR efficiency. The fabrication microcavity and measurement light extraction results of the active medium( GaN, AlGaN), the dielectric DBR and metal (Ag, Al) mirrors have been studied. Appendix contents all the programs code in MATLAB technical langue ( program displays the emission pattern for different...

This book explain the conditions in forming porous silicon and we compare the differences on porous formation using alternating current (AC) and direct current (DC) conditions.The purpose of porous is to change energy gap and surface area of silicon substrate. By making porous on silicon substrate, the photodetector device will become more efficient than the normal silicon substrate. The basic idea of metal-semiconductor-metal photodetector based porous silicon is to reduce the light reflection in order to enhance the light sensitivity and on the other hand to enhance the effects of the...