The research data zip file contains numerical values necessary to reproduce the Figures 2C, 3, 4, 6 and 7 and Figure SI-1 from the Supplementary Information of the corresponding paper, "Photoelectric tunable-step terahertz detectors: a study on optimal antenna parameters, speed, and temperature performance". In the following, the data contained in the folders of the zip file are explained.

"Figure 2C"
Figure 2C shows the resonant frequency dependence of the dipole antenna with gap size b=190nm, dipole width w=3μm and gate thickness h=100nm on dipole length l, from 15μm to 20μm. "Figure 2C electric field v.s. frequency.xlsx" contains the COMSOL simulation data for the average electric field amplitude within the gap between two gates at different frequencies and with different dipole length l. 

"Figure 3"
This folder contains the COMSOL simulation data for the distribution of Ex along the x-direrction, the 2D maps of the maximum Ex, Ex,max, and the radiation induced ac potential difference, Uac,x, as functions of the gap size b and the 2DEG depth d. The dimensions of the device is dipole length l=18μm, dipole width w=3μm and gate thickness h=100nm.
	"Figure 3A Ex along x axis.csv": The distribution of the absolute value of the x-component of the electric field, abs(Ex), in the 2DEG layer with a 2DEG depth d=90nm. Column 'cpl1x' is the distance in x direction in units of nm. Columns B to Q are the calculated abs(Ex) in units of 'V/m'.
	"Figure 3B Ex,max.csv" contains the data of the maximum x-component of the electric field, Ex,max, as a function of the gap size b and the 2DEG depth d.
	"Figure 3C Uac,x.csv" contains the data of the radiation induced ac potential difference, Uac,x, in the unit µV as a function of the gap size b and the 2DEG depth d.

"Figure 4"
This folder contains the detailed COMSOL simulation data for the dependence of Ex,max and Uac,x on the gap size b, the 2DEG depth d, and the gate thickness h. The length and width of the dipole antenna are fixed to 18μm and 3μm respectively.
	"Figure 4A Ex,max(b).csv": The dependence of Ex,max as a function of the gap size b. Columns B to G are the calculated Ex,max in the unit 'V/m'.
	"Figure 4B Uac,x(b).csv": The dependence of Uac,x as a function of the gap size b. Columns B to E are the calculated Uac,x in the unit 'μV'.
	"Figure 4C Ex,max(d).csv": The dependence of Ex,max as a function of the 2DEG depth d. Columns B to G are the calculated Ex,max in the unit of 'V/m'.
	"Figure 4D Uac,x(d).csv": The dependence of Uac,x as a function of the 2DEG depth d. Columns B to G are the calculated Uac,x in the unit 'μV'.
	"Figure 4E Ex,max(h).csv": The dependence of Ex,max as a function of the gate thickness h. Columns B to I are the calculated Ex,max in the unit 'V/m'.
	"Figure 4F Uac,x(h).csv": The dependence of Uac,x as a function of the gate thickness h. Columns B to E are the calculated Uac,x in the unit 'μV'.

"Figure 6"
This folder contains the conductance, photocurrent, photovoltage, as well as the response speed measurements of the dipole antenna PETS THz detector under 1.9 THz QCL radiation with zero source-drain bias.
	"Figure 6A Conductance 2D map.xlsx" contains the data of the conductance in dependence on the two gate voltages. The data were collected by lock-in amplifiers.
	"Figure 6B Iph 2D map.xlsx" contains the data of the photocurrent Iph as a function of the two gate voltages. The output signal was amplified by a preamplifier with 200 nA/V amplification, then the data was collected by a lock-in amplifier.
	"Figure 6C Vph on_off.xlsx" contains the photovoltage changing with time with "THz on" and "THz off" states. The data was measured by a lock-in amplifier.
	"Figure 6D speed measurement.xlsx": Photocurrent response (black line in the figure) of the device to the reference (blue line in the figure). All data were collected by a 200 MHz oscilloscope. Column 'Time' displays the original time values, which is normalized to align the onset of the reference signal's rising edge to zero, as indicated in the Column 'Normalized time'. Column 'Iph' is the photocurrent response of the device, which is averaged over 250 sweeps. Column 'Reference' is the reference square wave to drive the QCL.

"Figure 7"
This folder contains the maximum photocurrent, photovoltage and the current leakage of the device at different temperatures, ranging from 5K to 75K.
	"Figure 7A Iph v.s. T.xlsx": Column B and C are the maximum signal (i.e. signal with THz radiation incident) and the noise (i.e. signal with THz radiation blocked) in units of Volts. Column D is the real maximum photocurrent response calculated by (Signal_max_volt - Iph_noise_volt) * 200nA/V. Column E is the error bar of the photocurrent response.
	"Figure 7B Vph v.s. T.xlsx": Column B and C are the maximum signal (i.e. signal with THz radiation incident) and the noise (i.e. signal with THz radiation blocked) in units of μV. Column D is the real maximum photovoltage response calculated by (Signal_max - Noise). Column E is the error bar of the photovoltage response.
	"Figure 7C leakage current.xlsx" contains the data of the gate leakage current as a function of the gate voltage at different temperatures, measured with a Keithley 2400 source-measurement unit with 100nA current compliance.

"Figure SI-1"
This folder contains data supporting the first figure in the supplementary information.
	"Figure SI-1A Ez along x axis.csv": The distribution of the absolute value of the z-component of the electric field, abs(Ez), along the x axis in the 2DEG layer with a 2DEG depth d=90nm. Column 'cpl1x' is the distance in x direction in a unit of nm. Columns B to Q are the calculated abs(Ez) in units of 'V/m'.
	"Figure SI-1B Uac,z.csv" contains the data of the radiation induced ac potential difference, Uac,z, in the unit µV as a function of the gap size b and the 2DEG depth d.

"Figure SI-2"
This folder contains data supporting the second figure in the supplementary information.
	"(A) Theoretical Fabry-Perot transmittance.txt": Theoretical calculation of the transmittance for a 500 µm thick GaAs substrate with refractive index 3.55. The first column is the frequency in THz, the second column is the transmittance.
	"(B) Measured transmittance.txt": Experimentally measured transmittance. The first column is the frequency in THz, the second column is the transmittance. The time-domain spectroscopy measurement data underlying this transmittance is contained in the files "air_N2.dat" (nitrogen purged reference) and "sample4GaAsbefore.dat" (transmitted time domain signal through the GaAs wafer). These two files, measured on a Menlo Systems Tera K15 time domain spectroscopy system, contain the time in the unit of ps in the first column, and the THz signal measured on the photoconductive detection antenna in the second column.