InGaAs/InP multiple quantum well modulators in experiment and theory

Schwedler, R.; Mikkelsen, H.; Wolter, K.; Laschet, D.; Hergeth, J.; Kurz, H.

doi:10.1051/jp3:1994281

Cited by 1 publication

(2 citation statements)

References 29 publications

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“…4 show greater barrier height in the valence band, suggesting recombination is limited by holes. The wavefunction overlap is lower in the ASQW, which reduces the overall absorption magnitude, but may have benefits for detection through increased recombination lifetime [37], and for modulation through reduced insertion loss. The height of the step in the ASQW valence band is 43meV lower than the barrier in the SQW structure, which may also assist thermal escape [28], [29].…”

Section: Resultsmentioning

confidence: 99%

“…𝜂, and hence responsivity, 𝑅, were highly sensitive to 𝜏 𝑟,𝑖 , which had high uncertainty and was used as a fitting parameter in external quantum efficiency studies [35]. 𝜏 𝑟,𝑖 is directly proportional to temperature [36], inversely proportional to wavefunction overlap [37], and observed to be larger with the removal of aluminimum based alloys [26], [27]. Though these considerations were expected to increase 𝜏 𝑟,𝑖 in ASQW structures there was a large range of values from 0.1ns-1.5μs reported for varying structures in [18], [33], [35].…”

Section: F Parameterizationmentioning

confidence: 99%

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Photovoltaic Modulating Retroreflectors for Low Power Consumption Free Space Optical Communication Systems

Maglio,

Quintana,

Thueux

et al. 2024

IEEE J. Quantum Electron.

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InGaAs-InAsP-GaInP asymmetric stepped quantum well structure is proposed for unbiased detection and subsequent modulation of an incident continuous wave optical signal for application in compact, retroreflective, free-space optical communication platforms. Such operation drastically reduces onboard power consumption in large-area, pixelated arrays by driving only optically activated pixels. A modelling routine involving calculations of band structure, fraction of light absorbed, and responsivity have been used to analyse structures exhibiting an asymmetric quantum confined Stark effect. The proposed structure, compared with devices following similar modelling approaches, is predicted to exhibit an unbiased responsivity of 0.004 A/W enabling single pixel detection prior to triggering modulation. The calculated photocurrent of 4μA offers adequate signal to noise against dark current when operated in a photovoltaic mode. Furthermore, the strong blueshift in the ground state transition energy calculated for the applied field results in extinction ratios in excess of 4dB for the modulated signal. These findings suggest performance enhancements at a fraction of current onboard power consumption in modulating retroreflectors for compact, free-space optical communication platforms.

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Section: Resultsmentioning

confidence: 99%