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Terahertz electrical response of nanoscale three-branch junctions
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Scanning electron microscope image of the TBJ rectifier studied and electrical test configuration for the dc transfer curve measurement; (b) dc transfer curve at room temperature.

Image of FIG. 2.
FIG. 2.

Optics system and integrated device chip for the time-domain EO sampling measurement. The abbreviations are used as follows: beam splitter (BS), translational mirror (TM), acousto-optic modulator (AOM), polarizer (P), analyzer (A), plate (WP), and silicon photodetector (PD).

Image of FIG. 3.
FIG. 3.

Temporal waveform of a voltage pulse generated by the PC switch. The spatial separation between the PC switch and sampling point was 1 mm. The inset shows a waveform sampled at 0.22 mm away from the switch.

Image of FIG. 4.
FIG. 4.

(a) The points represent experimental data on the sampling-position dependence of the FWHM and rise time of the electrical pulse. The solid line represents simulated dependences, as described in the text. (b) Propagation constants calculated from the measured pulse shape and model. Points and solid lines represent the experimental data and the smoothed curves, respectively. Small oscillations visible in both and curves are artifacts caused by truncation of the Fourier transform.

Image of FIG. 5.
FIG. 5.

(a) Temporal shape of incident and reflected signal sampled before the TBJ rectifier. The inset shows the sampling position (). (b) Temporal shape of transmitted signal after the TBJ rectifier. The inset shows the sampling position (). (c) Enlarged view of the main pulses in Figs. 5(a) and 5(b). In this particular measurement, the PC switch was excited with an optical power of 4 mW and biased at 5 V. We stress that the overall temporal dependence of recorded transients did not change significantly with the excitation conditions used.

Image of FIG. 6.
FIG. 6.

Equivalent circuit used to estimate transmission and reflection at the CPW/TBJ interface. are matrix elements of the impedance matrix of the TBJ rectifier.

Image of FIG. 7.
FIG. 7.

Calculated waveform from Eq. (4). The voltage was divided by the pulse height of the incident pulse.

Image of FIG. 8.
FIG. 8.

Incident pulse height dependence of the transmitted pulse height. The points with error bars show experimental data. The solid line represents a scaled dc transfer curve [Fig. 1(b)] with a scaling factor of 0.102 to account for the effective coupling of incident voltage in the sub-THz frequencies.

Image of FIG. 9.
FIG. 9.

Fourier-transformed spectra of the incident and transmitted voltage transient signals. The temporal waveform in Fig. 3 was used for the incident spectrum, and that in Fig. 5(b) was used for the transmitted spectrum. The inset shows the normalized amplitude ratio of the transmitted spectrum to the incident one.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz electrical response of nanoscale three-branch junctions