We investigate characteristic fluctuations in multi-quantum well (MQW)-based waveguides whose absorption spectrum experimentally changes as a ∼5 nm blue shift when dielectric passivation layers are employed. We theoretically show that the blue shift corresponds to a ∼0.03% compressive strain in the MQW resulting in a group refractive index change (Δng) of ∼-0.01. The estimated Δng agrees with an experimentally obtained free spectral range of transmittance of an asymmetric Mach-Zehnder interferometer composed of the MQW structure. The results indicate that our theoretical estimation is an efficient way to evaluate the MQW-based waveguide performance with an external stress.
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CITATION STYLE
Ueda, Y., Hashizume, Y., Yamada, T., Matsuzaki, H., & Ishikawa, M. (2021). Theoretical and experimental investigation of external-stress effect on quantum-well-based semiconductor interferometer performance. Applied Physics Express, 14(9). https://doi.org/10.35848/1882-0786/ac17d1