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    1.
    发明专利
    未知

    公开(公告)号：DE68923924T2

    公开(公告)日：1996-04-18

    申请号：DE68923924

    申请日：1989-05-22

    Applicant: IBM

    Inventor： DULING III ,  GRISCHKOWSKY DANIEL R ,  HALBOUT JEAN-MARC ,  KETCHEN MARK B

    IPC: H01L31/0248 ,  H01S3/00 ,  H03B11/00 ,  H04B10/00 ,  H04B10/02 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/43 ,  H04L27/04

    Abstract: A communication system for transmitting and receiving terahertz signals has a emitter employing a resonant radiating antenna (5) connected to an ultrafast switch (6). The switch (6) is a subpicosecond photoconducting switch coupled to a coplanar transmission line (11) having a pair of approximately 1 micron wide A1 lines deposited on an SOS substrate. The transmission line (11) is separated from the tip of the antenna (5) by a photoconducting gap forming the switch and is driven by a laser pulse. Utilizing the gap excitation principle, the transmitting antenna (5) radiates a freely propagating signal that may be received by an identical structure either on the same or on different substrates.

    3.
    发明专利
    未知

    公开(公告)号：DE69003565T2

    公开(公告)日：1994-05-11

    申请号：DE69003565

    申请日：1990-02-19

    Applicant: IBM

    Inventor： CHIU GEORGE L ,  HALBOUT JEAN-MARC

    IPC: G01B7/34 ,  G01N27/00 ,  G01N37/00 ,  G01Q60/10 ,  G01Q60/14 ,  H01J37/28

    Abstract: Accurate voltage measurements on fast changing waveforms are carried out via stroboscopic tunneling potentionmetry using a tunneling microscope. The scanning tunneling microscope (STM) includes a test probe (22), having a test probe tip (23), and a sample (24) (with a conductor (25) supported thereon carrying the waveform to be sampled) arranged for measurement. The test probe (22) is supported so that the test probe tip (23) exhibits motion toward and away from the sample (24). The distance between the test probe tip (23) and the sample (24) modulates the tunneling current. In one embodiment, the test probe tip (23) is driven by a mechanical oscillator (100) to produce the desired motion. The mechanical oscillator (100) operates at a very high frequency (for example in the GHz ranges. The tunneling current flowing between the conductor (25) and the tip (23) which is a strong function of the instantaneous potential on the sample (24) is then determined by the convolution of the motion with the exponential dependence of current with respect to distance (between tip (23) and conductor (25)). Sampling is synchronized with the motion of the test probe tip (23). In other embodiments, the mechanical oscillator (100) is driven by a crystal oscillator (10) or replaced by an acoustic modulator in either tip (23) or sample (24) which has the effect of modulating the distance between tip (23) and sample (24) for the same purpose.

    5.
    发明专利
    未知

    公开(公告)号：DE68923924D1

    公开(公告)日：1995-09-28

    申请号：DE68923924

    申请日：1989-05-22

    Applicant: IBM

    Inventor： DULING III ,  GRISCHKOWSKY DANIEL R ,  HALBOUT JEAN-MARC ,  KETCHEN MARK B

    IPC: H01L31/0248 ,  H01S3/00 ,  H03B11/00 ,  H04B10/00 ,  H04B10/02 ,  H04B10/10 ,  H04B10/118 ,  H04B10/22 ,  H04B10/43 ,  H04L27/04

    Abstract: A communication system for transmitting and receiving terahertz signals has a emitter employing a resonant radiating antenna (5) connected to an ultrafast switch (6). The switch (6) is a subpicosecond photoconducting switch coupled to a coplanar transmission line (11) having a pair of approximately 1 micron wide A1 lines deposited on an SOS substrate. The transmission line (11) is separated from the tip of the antenna (5) by a photoconducting gap forming the switch and is driven by a laser pulse. Utilizing the gap excitation principle, the transmitting antenna (5) radiates a freely propagating signal that may be received by an identical structure either on the same or on different substrates.

    7.
    发明专利
    未知

    公开(公告)号：DE69003565D1

    公开(公告)日：1993-11-04

    申请号：DE69003565

    申请日：1990-02-19

    Applicant: IBM

    Inventor： CHIU GEORGE L ,  HALBOUT JEAN-MARC

    IPC: G01B7/34 ,  G01N27/00 ,  G01N37/00 ,  G01Q60/10 ,  G01Q60/14 ,  H01J37/28

    Abstract: Accurate voltage measurements on fast changing waveforms are carried out via stroboscopic tunneling potentionmetry using a tunneling microscope. The scanning tunneling microscope (STM) includes a test probe (22), having a test probe tip (23), and a sample (24) (with a conductor (25) supported thereon carrying the waveform to be sampled) arranged for measurement. The test probe (22) is supported so that the test probe tip (23) exhibits motion toward and away from the sample (24). The distance between the test probe tip (23) and the sample (24) modulates the tunneling current. In one embodiment, the test probe tip (23) is driven by a mechanical oscillator (100) to produce the desired motion. The mechanical oscillator (100) operates at a very high frequency (for example in the GHz ranges. The tunneling current flowing between the conductor (25) and the tip (23) which is a strong function of the instantaneous potential on the sample (24) is then determined by the convolution of the motion with the exponential dependence of current with respect to distance (between tip (23) and conductor (25)). Sampling is synchronized with the motion of the test probe tip (23). In other embodiments, the mechanical oscillator (100) is driven by a crystal oscillator (10) or replaced by an acoustic modulator in either tip (23) or sample (24) which has the effect of modulating the distance between tip (23) and sample (24) for the same purpose.

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