TY - JOUR
T1 - Ultrafast all-optical modulation by near-infrared intersubband transition in n-doped InGaAs/AlAsSb quantum wells
AU - Neogi, A.
AU - Yoshida, H.
AU - Mozume, T.
AU - Georgiev, N.
AU - Akiyama, T.
AU - Tackeuchi, A.
AU - Wada, O.
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) in the framework of Femtosecond Technology Project. The authors thank Mr T. Kuroda for his assistance in the PL measurement.
PY - 2001/7
Y1 - 2001/7
N2 - We demonstrate the ultrafast modulation of interband (IB)-resonant light (1.0-1.1 μm) by near-infrared intersubband (ISB)-resonant light (1.55-1.9 μm) in n-doped InGaAs/AlAsSb multiple quantum wells (QWs) using non-degenerate pump-probe spectroscopy. A modulation with an absorption recovery time of 1.0-2.0 ps has been observed in a planer-type modulation device due to ultrafast ISB relaxation of the carriers. The IB carrier relaxation process in the absence of an ISB-resonant light has also been investigated by time-resolved photoluminescence (PL) measurement. The modulation speed is determined by the inter- and intra-subband relaxation of the carriers in the conduction subband. The modulation speed at 1.1 μm due to an ISB-resonant pump light at 1.95 μm has been observed to be 1.4 ps at excitation energy of 500 fJ/μm2.
AB - We demonstrate the ultrafast modulation of interband (IB)-resonant light (1.0-1.1 μm) by near-infrared intersubband (ISB)-resonant light (1.55-1.9 μm) in n-doped InGaAs/AlAsSb multiple quantum wells (QWs) using non-degenerate pump-probe spectroscopy. A modulation with an absorption recovery time of 1.0-2.0 ps has been observed in a planer-type modulation device due to ultrafast ISB relaxation of the carriers. The IB carrier relaxation process in the absence of an ISB-resonant light has also been investigated by time-resolved photoluminescence (PL) measurement. The modulation speed is determined by the inter- and intra-subband relaxation of the carriers in the conduction subband. The modulation speed at 1.1 μm due to an ISB-resonant pump light at 1.95 μm has been observed to be 1.4 ps at excitation energy of 500 fJ/μm2.
KW - Antimonides pump-probe spectroscopy
KW - Intersubband transition
KW - Ultrafast optical modulation
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U2 - 10.1023/A:1017551212236
DO - 10.1023/A:1017551212236
M3 - Article
AN - SCOPUS:0035387665
SN - 0306-8919
VL - 33
SP - 975
EP - 983
JO - Optical and Quantum Electronics
JF - Optical and Quantum Electronics
IS - 7-10
ER -