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Plasmon-enhanced InAs Single Quantum Dot Fluorescence Radiation Changes Nanoscale Size Tuning Wavelength Research

  • Categories:Industry News
  • Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
  • Origin:
  • Time of issue:2022-02-15
  • Views:

(Summary description)Plasmon-enhanced InAs Single Quantum Dot Fluorescence Radiation Changes Nanoscale Size Tuning Wavelength Research: Semiconductor quantum dots are quantum structures with limited three-dimensional dimensions, which restrict the spatial distribution and motion of carriers, and thus have some unique physical properties, such as discrete energy levels, density of states similar to functions, etc. Quantum dots have good application prospects in single-photon emitting devices. After the surface plasmon treatment of metal nanostructures, it has rich and unique physical properties, which makes the optical field localized in the sub-wavelength size range, and has a strong localized electromagnetic field enhancement effect. Changing the nanometer size of metals can tune the resonant wavelength of surface plasmons. At the same time, metal nanostructures will also reduce the lifetime of fluorescence, reduce the intensity of fluorescence, or cause fluorescence quenching. When the nanostructures only resonate with the excitation light field, the fluorescence lifetime of the quantum dots remains unchanged; when the nanostructures resonate with the fluorescence of the quantum dots, the quantum yield can be improved, while the fluorescence lifetime of the quantum dots is reduced. The luminescence lifetime, luminescence intensity and saturation excitation power of the obtained quantum dots are all modulated by the gold island film. This is mainly manifested in the following three aspects: One is the enhancement of the localized laser field. The nanostructure of the gold island film allows the optical field to be localized in the sub-wavelength size, especially at some sharp corners or slits, which increases the localized strength of the electric field, which will lead to saturated excitation power. reduce; 2. The coupling between the quantum dot dipole transition and the gold island film leads to a decrease in the fluorescence lifetime, which belongs to the non-radiative recombination process of excitons. At the same time, the luminous energy is absorbed by the gold island film and lost, resulting in a decrease in the luminous intensity and an increase in the saturation excitation power; 3. The gold island film structure is used as a directional coupling-out antenna for quantum dot light emission, which increases the PL collection efficiency, resulting in a higher spectral collection efficiency, but has little effect on the saturated excitation power and fluorescence lifetime. The coupling between the gold island film and the quantum dot emission is related to the emission wavelength of the quantum dot and the specific nanostructure of the gold island film in the quantum dot sample. The metal nanostructure can change the radiation direction of the light field to form the directional emission of the light field. Therefore, metal nanostructures are widely used to study excitation light field enhancement, fluorescence emission coupling and their interaction with dipole luminescence, such as using Tam plasmon modes, nanoparticles, nanoantennas, metal films, nanostructures And plasmon resonance, etc., improve the fluorescence radiation intensity of quantum dots, form fluorescence directional emission, improve fluorescence collection efficiency, etc. Plasma enhances the fluorescence radiation of single quantum dots and improves the quality of the luminous effect of the product. The main physical mechanism of the fluorescence enhancement effect is that the gold island film structure acts as an effective directional coupling output of quantum dots, and the antenna increases the PL collection efficiency of the quantum dots, thereby obtaining a higher spectral collection efficiency. The gold island film structure mainly enhances the collection efficiency of quantum dot spectra, providing an efficient method for preparing bright single-photon sources. At the same time, it is also observed that a small number of quantum dots like QD2 have the phenomenon that the luminescence lifetime is shortened (about 270ps), the saturation excitation power is increased (about 1nW), and the total fluorescence intensity is weakened. This is because the luminescence energy is reduced by gold. The island film is absorbed and lost, and no radiation recombination plays a major role. The gold island film has a certain modulation effect on the luminescence lifetime, luminescence intensity and saturation excitation power of quantum dots. The gold island film nanostructure is beneficial to improve the collection efficiency of PL spectra of quantum dots, which provides an efficient method for fabricating bright single-photon sources.

Plasmon-enhanced InAs Single Quantum Dot Fluorescence Radiation Changes Nanoscale Size Tuning Wavelength Research

(Summary description)Plasmon-enhanced InAs Single Quantum Dot Fluorescence Radiation Changes Nanoscale Size Tuning Wavelength Research:
Semiconductor quantum dots are quantum structures with limited three-dimensional dimensions, which restrict the spatial distribution and motion of carriers, and thus have some unique physical properties, such as discrete energy levels, density of states similar to functions, etc. Quantum dots have good application prospects in single-photon emitting devices. After the surface plasmon treatment of metal nanostructures, it has rich and unique physical properties, which makes the optical field localized in the sub-wavelength size range, and has a strong localized electromagnetic field enhancement effect. Changing the nanometer size of metals can tune the resonant wavelength of surface plasmons.
At the same time, metal nanostructures will also reduce the lifetime of fluorescence, reduce the intensity of fluorescence, or cause fluorescence quenching. When the nanostructures only resonate with the excitation light field, the fluorescence lifetime of the quantum dots remains unchanged; when the nanostructures resonate with the fluorescence of the quantum dots, the quantum yield can be improved, while the fluorescence lifetime of the quantum dots is reduced. The luminescence lifetime, luminescence intensity and saturation excitation power of the obtained quantum dots are all modulated by the gold island film. This is mainly manifested in the following three aspects:
One is the enhancement of the localized laser field. The nanostructure of the gold island film allows the optical field to be localized in the sub-wavelength size, especially at some sharp corners or slits, which increases the localized strength of the electric field, which will lead to saturated excitation power. reduce;
2. The coupling between the quantum dot dipole transition and the gold island film leads to a decrease in the fluorescence lifetime, which belongs to the non-radiative recombination process of excitons. At the same time, the luminous energy is absorbed by the gold island film and lost, resulting in a decrease in the luminous intensity and an increase in the saturation excitation power;
3. The gold island film structure is used as a directional coupling-out antenna for quantum dot light emission, which increases the PL collection efficiency, resulting in a higher spectral collection efficiency, but has little effect on the saturated excitation power and fluorescence lifetime. The coupling between the gold island film and the quantum dot emission is related to the emission wavelength of the quantum dot and the specific nanostructure of the gold island film in the quantum dot sample.
The metal nanostructure can change the radiation direction of the light field to form the directional emission of the light field. Therefore, metal nanostructures are widely used to study excitation light field enhancement, fluorescence emission coupling and their interaction with dipole luminescence, such as using Tam plasmon modes, nanoparticles, nanoantennas, metal films, nanostructures And plasmon resonance, etc., improve the fluorescence radiation intensity of quantum dots, form fluorescence directional emission, improve fluorescence collection efficiency, etc.
Plasma enhances the fluorescence radiation of single quantum dots and improves the quality of the luminous effect of the product. The main physical mechanism of the fluorescence enhancement effect is that the gold island film structure acts as an effective directional coupling output of quantum dots, and the antenna increases the PL collection efficiency of the quantum dots, thereby obtaining a higher spectral collection efficiency.
The gold island film structure mainly enhances the collection efficiency of quantum dot spectra, providing an efficient method for preparing bright single-photon sources. At the same time, it is also observed that a small number of quantum dots like QD2 have the phenomenon that the luminescence lifetime is shortened (about 270ps), the saturation excitation power is increased (about 1nW), and the total fluorescence intensity is weakened. This is because the luminescence energy is reduced by gold. The island film is absorbed and lost, and no radiation recombination plays a major role.
The gold island film has a certain modulation effect on the luminescence lifetime, luminescence intensity and saturation excitation power of quantum dots. The gold island film nanostructure is beneficial to improve the collection efficiency of PL spectra of quantum dots, which provides an efficient method for fabricating bright single-photon sources.

  • Categories:Industry News
  • Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
  • Origin:
  • Time of issue:2022-02-15 15:49
  • Views:
Information

Plasmon-enhanced InAs Single Quantum Dot Fluorescence Radiation Changes Nanoscale Size Tuning Wavelength Research:
Semiconductor quantum dots are quantum structures with limited three-dimensional dimensions, which restrict the spatial distribution and motion of carriers, and thus have some unique physical properties, such as discrete energy levels, density of states similar to functions, etc. Quantum dots have good application prospects in single-photon emitting devices. After the surface plasmon treatment of metal nanostructures, it has rich and unique physical properties, which makes the optical field localized in the sub-wavelength size range, and has a strong localized electromagnetic field enhancement effect. Changing the nanometer size of metals can tune the resonant wavelength of surface plasmons.

At the same time, metal nanostructures will also reduce the lifetime of fluorescence, reduce the intensity of fluorescence, or cause fluorescence quenching. When the nanostructures only resonate with the excitation light field, the fluorescence lifetime of the quantum dots remains unchanged; when the nanostructures resonate with the fluorescence of the quantum dots, the quantum yield can be improved, while the fluorescence lifetime of the quantum dots is reduced. The luminescence lifetime, luminescence intensity and saturation excitation power of the obtained quantum dots are all modulated by the gold island film. This is mainly manifested in the following three aspects:
One is the enhancement of the localized laser field. The nanostructure of the gold island film allows the optical field to be localized in the sub-wavelength size, especially at some sharp corners or slits, which increases the localized strength of the electric field, which will lead to saturated excitation power. reduce;
2. The coupling between the quantum dot dipole transition and the gold island film leads to a decrease in the fluorescence lifetime, which belongs to the non-radiative recombination process of excitons. At the same time, the luminous energy is absorbed by the gold island film and lost, resulting in a decrease in the luminous intensity and an increase in the saturation excitation power;
3. The gold island film structure is used as a directional coupling-out antenna for quantum dot light emission, which increases the PL collection efficiency, resulting in a higher spectral collection efficiency, but has little effect on the saturated excitation power and fluorescence lifetime. The coupling between the gold island film and the quantum dot emission is related to the emission wavelength of the quantum dot and the specific nanostructure of the gold island film in the quantum dot sample.
The metal nanostructure can change the radiation direction of the light field to form the directional emission of the light field. Therefore, metal nanostructures are widely used to study excitation light field enhancement, fluorescence emission coupling and their interaction with dipole luminescence, such as using Tam plasmon modes, nanoparticles, nanoantennas, metal films, nanostructures And plasmon resonance, etc., improve the fluorescence radiation intensity of quantum dots, form fluorescence directional emission, improve fluorescence collection efficiency, etc.
Plasma enhances the fluorescence radiation of single quantum dots and improves the quality of the luminous effect of the product. The main physical mechanism of the fluorescence enhancement effect is that the gold island film structure acts as an effective directional coupling output of quantum dots, and the antenna increases the PL collection efficiency of the quantum dots, thereby obtaining a higher spectral collection efficiency.
The gold island film structure mainly enhances the collection efficiency of quantum dot spectra, providing an efficient method for preparing bright single-photon sources. At the same time, it is also observed that a small number of quantum dots like QD2 have the phenomenon that the luminescence lifetime is shortened (about 270ps), the saturation excitation power is increased (about 1nW), and the total fluorescence intensity is weakened. This is because the luminescence energy is reduced by gold. The island film is absorbed and lost, and no radiation recombination plays a major role.
The gold island film has a certain modulation effect on the luminescence lifetime, luminescence intensity and saturation excitation power of quantum dots. The gold island film nanostructure is beneficial to improve the collection efficiency of PL spectra of quantum dots, which provides an efficient method for fabricating bright single-photon sources.

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