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Method and device for realizing atomic-scale laser pumping detection

A laser pumping and scale technology, applied in the field of detection, can solve problems such as interference tunneling current, and achieve the effect of improving the signal-to-noise ratio and eliminating the influence.

Inactive Publication Date: 2020-09-29
PEKING UNIV
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Problems solved by technology

However, the thermal effect of the laser will greatly interfere with the tunneling current, which is the biggest challenge for the combination of the two technologies. In addition, the tunneling current induced by the laser is a high-order and small amount compared with the background current, and it is necessary to use the method of weak signal extraction to improve the signal. noise ratio

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  • Method and device for realizing atomic-scale laser pumping detection
  • Method and device for realizing atomic-scale laser pumping detection
  • Method and device for realizing atomic-scale laser pumping detection

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Embodiment Construction

[0022] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described The embodiments are only some of the embodiments in this specification, not all of them. Based on the embodiments in this specification, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of this specification.

[0023] Such as figure 1 As shown, some embodiments of this specification provide a method for realizing atomic-scale laser pumping detection, the method includes the following steps:

[0024] S102. After triggering the first laser to emit the first laser pulse and the second laser to emit the second laser pulse based on the electric pulse, adjust the delay tim...

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Abstract

The invention discloses a method and device for realizing atomic-scale laser pumping detection. The method comprises the steps of triggering a first laser to emit a first laser pulse and a second laser to emit a second laser pulse based on an electric pulse, and adjusting the delay time between the first laser pulse and the second laser pulse; editing the waveform of the electric pulse to modulatethe delay time; combining and collimating the first laser pulse and the second laser pulse and irradiating an object to be detected; detecting the tunneling current signals of the irradiated object to be detected; and extracting a signal related to the delay time in the tunneling current signals. According to the invention, while signal modulation is realized, the laser average power in unit timeis ensured to be constant; therefore, the influence of the heat effect on a scanning tunneling microscope can be eliminated; the combination of the laser pumping detection technology and the scanningtunneling microscope technology is realized; and the atomic-scale spatial resolution and the nanosecond-scale time resolution can be obtained at the same time.

Description

technical field [0001] This specification relates to the field of detection, especially a method and device for realizing atomic-scale laser pumping detection. Background technique [0002] Scanning Tunneling Microscope (STM, Scanning Tunneling Microscope) utilizes the principle of quantum tunneling to obtain atomic-scale spatial resolution through tunneling current. Application prospects. However, since the signal source (tunneling current) of STM needs to be extracted after passing through an electrical amplifier, the time resolution of STM is limited by the bandwidth of the external circuit, which generally can only reach the order of microseconds at present. [0003] The time resolution of the pump-probe technology in optics depends on the laser pulse width. Ultra-high time resolution can be achieved by using ultra-short laser pulses, but its own spatial resolution depends on the spot diameter. Due to the diffraction limit limit, far from reaching the atomic level. By...

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Application Information

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IPC IPC(8): G01Q60/14
CPCG01Q60/14
Inventor 江颖郭钞宇
Owner PEKING UNIV
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