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首页> 外文期刊>Journal of Applied Physics >Infrared photocurrent with one- and two-photon absorptions in a double-barrier quantum well system
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Infrared photocurrent with one- and two-photon absorptions in a double-barrier quantum well system

机译：双势垒量子阱系统中具有单光子和双光子吸收的红外光电流

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摘要

We present a theoretical investigation of a double-barrier quantum-well infrared photodetector (QWIP) having two-color selectivity. The quantum well is placed between a pair of potential barriers in order to increase selectivity through modulation of the continuum states. This also leads to a potential decrease in the dark current. Calculations are carried in the effective-mass approximation using a single-electron hamiltonian. The approach used to obtain the photocurrent yields the observation of single as well as many-photon transitions in a unified manner, by naturally accounting for real and virtual processes through intermediate states that take part in the generation of photocurrent. The two-color selectivity of the calculated photocurrent spectra comes from both one- and two-photon transitions. The performance of the system studied is compared to the results for the isolated quantum well and the advantages of the double barrier are pointed out.
机译：我们目前对具有双色选择性的双势垒量子阱红外光电探测器（QWIP）进行理论研究。量子阱放置在一对势垒之间，以通过调制连续态来提高选择性。这也导致暗电流的潜在减小。使用单电子哈密顿量以有效质量近似值进行计算。通过自然地考虑参与光电流产生的中间状态的真实和虚拟过程，用于获得光电流的方法可以统一方式观察单光子和多光子跃迁。计算出的光电流谱的双色选择性来自一光子跃迁和两光子跃迁。将所研究系统的性能与孤立量子阱的结果进行了比较，指出了双势垒的优点。

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  • 来源
    《Journal of Applied Physics》 |2011年第10期|p.104313.1-104313.8|共8页
  • 作者

    Marcos H. Degani; Marcelo Z. Maialle; Paulo F. Farinas; Nelson Studart;

  • 作者单位

    Faculdade de Ciencias Aplicadas, Universidade Estadual de Campinas - UNICAMP, R. Pedro Zaccaria, 1300,13484-350 Limeira, SP, Brazil;

    Faculdade de Ciencias Aplicadas, Universidade Estadual de Campinas - UNICAMP, R. Pedro Zaccaria, 1300,13484-350 Limeira, SP, Brazil;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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