研究目的
To develop a functional ZnO photonic crystal (PC) for the terahertz (THz) band using a three-dimensional (3D) printing technique, aiming to control THz radiation.
研究成果
The fabrication of ZnO woodpile PCs by the 3D printing technique has been demonstrated, with the samples showing good optical properties in the THz frequency region. The experimental results are in good agreement with theoretical predictions, indicating the potential for these PCs to be used in efficient THz devices.
研究不足
The study is limited by the volume shrinkage of the sample after thermal treatment, which changes the parameters from the CAD design. Additionally, the technique's capability to process structures with feature sizes ranging from nanoscale to mesoscale may limit the resolution of the fabricated PCs.
1：Experimental Design and Method Selection:
The study focuses on the fabrication of ZnO woodpile photonic crystals (PCs) using a 3D printing technique. The design is based on a woodpile lattice with appropriate periodicity for the THz region.
2：Sample Selection and Data Sources:
Highly concentrated ZnO ink (50 vol%) was used to fabricate the 3D structure on alumina substrates.
3：List of Experimental Equipment and Materials:
A robotic deposition equipment (A3200, Aerotech Inc., USA) controlled by computer-aided design software Robocad
4：4 (3D Inks, USA) was used. ZnO ink was prepared and loaded into a 3 mL syringe fitted with a precision tip nozzle of diameter 200 μm (Nordson EFD, Japan). Experimental Procedures and Operational Workflow:
The 3D structure was patterned on alumina substrates at a pressure of 15 bar and printing velocity of 8 mm/s. The structure consists of 20 layers along the stacking direction, with spacing rods of d = 707 μm and rod diameter w = 200 μm. The structure was sintered at 900 °C for 1 h in air.
5：Data Analysis Methods:
The optical properties were measured using THz time-domain spectroscopy (THz-TDS), and the results were compared with theoretical simulations using the MIT photonic bands (MPB) software package.
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X-ray diffractometer
Siemens D500
Siemens
Used for recording XRD patterns of the samples.
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electronic microscope
JEOL 6400
Jeol Ltd.
Used for studying the microstructure and surface morphology of the samples.
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stereomicroscope
Olympus SZX12
Olympus
Used for studying the surface morphology of the samples.
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photoconductive antennas
Menlo TERA8-1
Menlo
Used for producing and detecting THz waves in the spectrometer.
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robotic deposition equipment
A3200
Aerotech Inc.
Used for fabricating the 3D structure of ZnO woodpile PCs.
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computer-aided design software
Robocad 3.4
3D Inks
Controls the robotic deposition equipment for precise fabrication.
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precision tip nozzle
200 μm
Nordson EFD
Used for depositing the ZnO ink with high precision.
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air-powered fluid dispenser
Performus VII attached to HP7x
Nordson EFD
Supplies pressure for the deposition process.
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THz time-domain spectrometer
THz-TDS
Used for optical characterization of the samples in the THz range.
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