Infrared optical detection system and method based on quartz tuning fork surface plasmon enhanced absorption

A surface plasmon, quartz tuning fork technology, applied in the field of infrared light detection of sensors, can solve problems such as low sensitivity and poor light absorption, and achieve the effects of improved detection sensitivity, enhanced resonance absorption, and high noise immunity.

Pending Publication Date: 2022-04-19
HEBEI UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to provide an infrared optical detection system and method based on quartz tuning fork surface plasmon enhanced absorption to solve the problems of poor light absorption and low sensitivity of the existing detection system

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  • Infrared optical detection system and method based on quartz tuning fork surface plasmon enhanced absorption
  • Infrared optical detection system and method based on quartz tuning fork surface plasmon enhanced absorption
  • Infrared optical detection system and method based on quartz tuning fork surface plasmon enhanced absorption

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Embodiment Construction

[0026] Such as Figure 1 to Figure 3 As shown, the present invention proposes a quartz tuning fork infrared optical detection system based on the surface plasmon-enhanced absorption of the quartz tuning fork. The specific structure includes:

[0027] The light source under test uses an infrared laser as the light source under test, and its output power is controlled by the driving current. The laser modulation signal is provided by a function generator. The continuous light output by the light source passes through an optical chopper and becomes pulsed light with a certain pulse repetition frequency and a certain pulse width. After that, the focusing lens focuses the laser beam to the root area of ​​the tuning fork arm.

[0028] Quartz tuning fork system, using the thermoelastic effect of quartz tuning fork for light detection. The pulsed light is irradiated on the tuning fork arm, the tuning fork arm is heated and deformed, and the deformation is converted into an electrical...

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Abstract

The invention provides an infrared optical detection system and method based on quartz tuning fork surface plasmon enhanced absorption, the detection system comprises a detected light source, a quartz tuning fork system and a signal processing system, and the surface of a tuning fork arm is provided with a plasmon nanostructure. The composite material sequentially comprises a metal layer, a polydimethylsiloxane layer, a silicon dioxide layer, polystyrene microspheres and a nanogold gel composite layer from bottom to top. Based on the thermoelastic effect of the quartz tuning fork, perfect light absorption is achieved through the surface plasmon effect, tiny thermoelastic deformation generated by a cantilever of the quartz tuning fork due to light absorption is converted into an electric signal through the piezoelectric effect, signal demodulation is conducted through the lock-in amplifier, and therefore low-cost and high-sensitivity infrared detection at the room temperature is achieved.

Description

technical field [0001] The invention relates to the technical field of infrared light detection of sensors, in particular to an infrared optical detection system and method based on quartz tuning fork surface plasmon enhanced absorption. Background technique [0002] Photodetectors play an important role in applications such as spectroscopic analysis, gas detection, and optical communication. Photodiodes (PDs) are fast in response and high in sensitivity, however, typically they generate signals only in a narrow wavelength range, depending on the bandgap of the materials used to construct them. For example, InGaAs photodetectors have good responsivity in the range of 800-1700 nm, and the detection wavelength of HgCdTe detectors can reach 5500 nm. Thermopile sensors use the photothermoelectric effect to convert incident light into heat energy, but their thermal noise is usually large. High-sensitivity broadband infrared light detection is still a great challenge at this sta...

Claims

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Application Information

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IPC IPC(8): G01J1/04G01J1/42
CPCG01J1/0407G01J1/42G01J2001/4295
Inventor娄存广刘秀玲王宇代佳亮刘欣张瑜李依凡
OwnerHEBEI UNIVERSITY