A gold nanoparticle enhanced microwave modulation with 1.55 μm light in graphene-based antenna has been studied in this paper. The modulation of antenna radiation is achieved by the conductivity tunable characteristic of graphene, and the conductivity of graphene is controlled by light. With the introduction of the gold nanoparticles for exciting optical wave localized enhancement, the interaction between the graphene and the light is enhanced. And then the Fermi level is enlarged, leading to the enhancement of the conductivity turning rage of graphene. At last, the modulation of microwave radiation is enhanced. In the simulation, as the Fermi level of graphene increases from 0.1 eV to 0.4 eV, the S11 coefficient of resonant point of antenna changes by 8 dB. In the experiment, the 0-29.4 mw 1550 nm light is used, the S11 coefficient of graphene antenna with gold nanoparticles changes by 1 dB, which is 2 times higher than that of graphene antenna without gold nanoparticles. The result demonstrates that the microwave modulation by light in graphene-based antenna could be enhanced by gold nanostructures with the localized surface plasmons.
This paper proposed a novel pressure sensors based on polymer film with surface microstructures. Polymer film with surface microstructures have displayed unique optoelectronic and electrical properties due to the triboelectric effect. The micro-deformation and moving of polymer microstructures can product electrostatic charge. The pressure sensors can convert external pressure or mechanical deformation into electrical signal. The pressure sensor consists of one polymer film with surface microstructures and one conductive electrode layer. The regular microstructures increase the film roughness and contact triboelectric area to enhance the electrostatic effect. To enhance the performance of the pressure sensor, high-precision microstructures on soft polymer sensitive layers are fabricated using UV nanoimprint lithography to generate more triboelectric charges. The pressure sensor is prepared, which consists of grating with 3 μm- period on the surface of the elastic layer and an indium tin oxide electrode thin film. By converting the friction mechanical energy into electrical power, a maximum power of 423.8 mW/m2 and the sensitivity of 0.7 V/kPa at a frequency of 5 Hz are obtained, which proves the excellent sensing performance of the sensor.
High resolution and high precision polymer nanostructures has unique chemical and physical properties, playing an important role in nano-optics, nano-photonics, and high sensitivity biological detection. This paper demonstrated a novel fabrication method of biological detection chip based on polymer nanostructures via nanoimprint lithography. High precision nanostructures such as nanopillar arrays were prepared on chip film via nanoimprint lithography. The polymer nanostructures were used to enhance adhesion to cancer cells, which is low-cost and suitable for mass production. The replication polymer was biocompatibility materials that has no effect on cells. The experiment results show that the nanopillar arrays chip can adhere lung cancer cells in the size of 10-15 μm to achieve the purpose of filtering and detecting cells. Results of the experiments show that this new biological detection chip has potential applications of cancer detection, targeted therapy, food safety testing, and environmental monitoring.
We report a temperature measurement method based on fixed wavelength transmission intensity of long-period fiber grating. Relative to wavelength or edge filtering, this method has obvious advantages in measurement accuracy and cost. The relationship between the transmission intensity and temperature at a fixed wavelength is simulated based on the theory of long-period fiber grating coupling mode. The results show that the transmission intensity of the fixed wavelength is linearly related to the temperature with the appropriate parameters. In the experiment, the transmission spectrum shows two resonant peaks at 1485 and 1538 nm. Two fixed wavelengths at 1480.4 and 1549.7 nm were selected, and the results show a linear relationship between transmission intensity and temperature. The temperature sensitivity of the transmission intensity at 1480.4 nm is about 0.0544 dB / ° C, which means the value of I1480.4 nm / I0 changes by 1.3% for every 1°C. To eliminate the influence of light source and enhance the measurement sensitivity, the ratio of the transmission intensity of two fixed wavelengths was selected to carry out the temperature measurement. The temperature sensitivity of the ratio of I1480.4 nm / I1549.7 nm was 0.0729 dB / ° C, that is, the light intensity ratio changed by 1.7% when the temperature changed by 1°C. A more reasonable design of long-period fiber grating and a more appropriate selection of fixed wavelength should be able to obtain higher temperature sensitivity.
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