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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11455
Title: Estimation of acoustically induced refractive index perturbation in silicon and germanium slab for optical applications
Authors: Sharma G.
Kumar S.
Kumar D.
Singh V.
Published in: Optica Applicata
Abstract: In-plane displacement field and refractive index variation for silicon and germanium in the presence of Lamb wave is estimated for optical applications. The required dispersion equation in a thin silicon and germanium plates is obtained using the method of potentials with boundary conditions involving the bulk and surface stress of the materials considered. The eigen-values thus obtained are used to compute the Lamb wave modes for the slab of silicon and germanium at same thickness. The fundamental anti-symmetric and symmetric plate modes and their overtones are observed due to confinement of acoustic energy within the slab thickness. In addition, the excited symmetric modes in silicon have longer wavelengths than those of germanium at a fixed frequency. Therefore, the refractive index modulation through the Lamb wave in silicon is always larger as compared to that of germanium. This refractive index modulation can be treated as periodic sinusoidal refractive index variation and may be considered as a tunable one-dimensional photonics crystal.
Citation: Optica Applicata (2015), 45(4): 491-500
URI: https://doi.org/10.5277/oa150405
http://repository.iitr.ac.in/handle/123456789/11455
Issue Date: 2015
Publisher: Technical University of Wroclaw
Keywords: Dispersion relation
Displacement field
Lamb wave mode in silicon and germanium
Refractive index modulation
ISSN: 785466
Author Scopus IDs: 57202965230
7405769266
57202478211
57207179005
Author Affiliations: Sharma, G., Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi, UP, 221005, India
Kumar, S., Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi, UP, 221005, India
Kumar, D., Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi, UP, 221005, India
Singh, V., Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi, UP, 221005, India
Funding Details: This work is supported by the project No. MRP-MAJOR-ELEC-2013-12554, UGC, New Delhi. The authors are grateful to Prof. R.D.S. Yadava, Physics Department, BHU, for his continuous encouragement and support in many ways.
Corresponding Author: Singh, V.; Department of Physics, Faculty of Science, Banaras Hindu UniversityIndia; email: viveks@bhu.ac.in
Appears in Collections:Journal Publications [ME]

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