Strong quantum-confined Stark effect from light hole related direct-gap transitions in Ge quantum wells
P Chaisakul, D Marris-Morini, MS Rouifed… - Applied Physics …, 2013 - pubs.aip.org
A strong quantum-confined Stark effect (QCSE) from light hole related transitions at the Γ
point (LH1-cΓ1) in Ge/Si 0.15 Ge 0.85 multiple quantum wells is demonstrated from both
photocurrent and optical transmission measurements. Our experimental results show a large
and sharp optical absorption peak due to LH1-cΓ1 transitions, and its associated strong
absorption change based on the QCSE. By exploiting LH1-cΓ1 transitions, optical
modulators with improved compactness and competitive extinction ratio and optical loss can …
point (LH1-cΓ1) in Ge/Si 0.15 Ge 0.85 multiple quantum wells is demonstrated from both
photocurrent and optical transmission measurements. Our experimental results show a large
and sharp optical absorption peak due to LH1-cΓ1 transitions, and its associated strong
absorption change based on the QCSE. By exploiting LH1-cΓ1 transitions, optical
modulators with improved compactness and competitive extinction ratio and optical loss can …
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