Application Cases

Experiment Name: Characterization of Novel Reconfigurable Metasurface Devices

Research Direction: Novel Terahertz Functional Devices Based on Metasurfaces

Experiment Content: The experiment involves using a power amplifier to amplify the voltage signal output from a signal generator and connecting the signal to a novel metasurface device. By leveraging the Joule heating effect generated by the electrical signal, the temperature of the metasurface device is increased, inducing changes in the crystalline state and electrical conductivity of the non-volatile phase-change material within the device, thereby modulating the response characteristics of the metasurface device.

Testing Equipment: Signal generator, ATA-308 power amplifier, oscilloscope, etc.

Figure 1: Experimental Setup

Experiment Process: Initially, a single-pulse square wave signal with adjustable width is generated by the signal generator and input into the power amplifier. An appropriate amplification factor is set in the power amplifier to obtain a single-pulse voltage signal with the target peak value. Subsequently, the amplified voltage signal is connected to the electrodes of the novel metasurface device, and an oscilloscope used for monitoring the amplitude of the voltage signal waveform is connected in parallel with the metasurface. Using manual triggering, a single-pulse excitation is applied to the metasurface device, inducing a phase change in the phase-change material within the device.

Test Results:

Based on the Joule heating effect of the voltage signal, changes in the crystalline state and electrical conductivity of the phase-change material within the metasurface device lead to alterations in the device's response in the terahertz frequency band. Through subsequent terahertz time-domain spectroscopy measurements, clear changes in the device's response under different electrical pulse excitations can be observed.

Power Amplifier Recommendation: ATA-308C Power Amplifier

Figure: Specifications of the ATA-308C Power Amplifier