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The gradient elastic constitutive equation incorporating the second gradient of the strains is used to determine the monochromatic elastic plane wave propagation in a gradient infinite medium and thin rod.The equation of motion,together with the internal material length,has been derived.Various dispersion relations have been determined.We present explicit expressions for the relationship between various wave speeds,wavenumber and internal material length. 相似文献
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The 1.3-μm polarization-insensitive superluminescent diodes (SLDs) with weak tensile strained multiplequantum-well (MQW) and complex strained MQW were demonstrated theoretically based on the simulation of energy band structure and gain spectra at different injected carrier densities. Compared with the weak tensile strained MQW, the complex strained MQW gets higher modal gain and better modal gain matching between TE and TM modes, and the polarization sensitivity of TE and TM optical spectra can remain less than 1.0 dB over a bandwidth of 200 nm. 相似文献
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