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    26.
    发明专利
    未知

    公开(公告)号：DE69923890D1

    公开(公告)日：2005-04-07

    申请号：DE69923890

    申请日：1999-07-20

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CAPASSO FEDERICO ,  YI CHO ALFRED ,  GMACHL CLAIRE F ,  HUTCHINSON ALBERT LEE ,  SIVCO DEBORAH LEE ,  FAIST JEROME ,  SIRTORI CARLO

    IPC: H01S5/00 ,  H01S5/042 ,  H01S5/10 ,  H01S5/323 ,  H01S5/34 ,  H01S5/343 ,  H01S5/30

    Abstract: A long wavelength (e.g., mid-IR to far-IR) semiconductor laser comprises an active region and at least one cladding region characterized in that the cladding region includes a light guiding interface between two materials which have dielectric constants opposite in sign. Consequently, the guided modes are transverse magnetic polarized surface waves (i.e., surface plasmons) which propagate along the interface without the need for a traditional dielectric cladding. In a preferred embodiment, the interface is formed between a semiconductor layer and a metal layer. The complex refractive index of the metal layer preferably has an imaginary component which is much larger than its real component. In an illustrative embodiment, our laser includes a Quantum cascade active region sandwiched between a pair of cladding regions one of which is a guiding interface based on surface plasmons and the other of which is a dielectric (e.g., semiconductor) structure.

    28.
    发明专利
    未知

    公开(公告)号：DE60007959D1

    公开(公告)日：2004-03-04

    申请号：DE60007959

    申请日：2000-09-04

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CAPASSO FEDERICO ,  CHO ALFRED YI ,  CHU SUNG-NEE GEORGE ,  GMACHL CLAIRE F ,  KOEHLER RUEDEGER ,  SIVCO DEBORAH LEE ,  TREDICUCCI ALESSANDRO

    IPC: H01S5/125 ,  H01S5/042 ,  H01S5/10 ,  H01S5/12 ,  H01S5/34 ,  H01S5/30

    Abstract: An article comprising a QC-DFB laser is disclosed. In the QC-DFB laser (10), an overlying grating structure achieves relatively strong coupling of the guided mode to the grating, and is thus highly effective in inducing single-mode operation even under cw operating conditions. The grating structure includes grooves (25) etched in a plasmon-enhanced confinement layer (PECL) (22) disposed adjacent and in contact with an upper metallic electrode (23). The grating structure and the PECL (22) are designed such that in the grooves (25), the laser mode travelling in the waveguide can couple efficiently to the surface-plasmon at the electrode interface. This results in strong modulation of the laser mode, leading to strong modulation of, inter alia, the effective refractive index.

    29.
    发明专利
    未知

    公开(公告)号：DE69900427T2

    公开(公告)日：2002-06-27

    申请号：DE69900427

    申请日：1999-05-26

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BAILLARGEON JAMES NELSON ,  CAPASSO FEDERICO ,  CHO ALFRED YI ,  GMACHL CLAIRE F ,  HUTCHINSON ALBERT LEE ,  SIVCO DEBORAH LEE ,  TREDICUCCI ALESSANDRO

    IPC: H01S5/00 ,  H01S5/34 ,  H01S5/343

    Abstract: A novel quantum cascade (QC) laser comprises a multiplicity of identical repeat units, with each repeat unit comprising an active region and an injector region. The injector region comprises quantum wells and barriers, selected to facilitate, under appropriate bias, resonant carrier transport from a lower energy level of a given active region to an upper energy level of an adjacent downstream active region. Carrier transition from the energy level to a lower energy level of an active region results in emission of infrared radiation. The laser is advangeously used in, e.g., a measurement system for detection of trace compounds in air.

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