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Gap independent coupling into parallel plate terahertz waveguides using cylindrical horn antennas
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10.1063/1.4754846
/content/aip/journal/jap/112/7/10.1063/1.4754846
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/7/10.1063/1.4754846

Figures

Image of FIG. 1.
FIG. 1.

Top: Dimensions of the CYLWG. Top figure is the side view, and the bottom figure is the top-down view of a single plate showing the milled out 28 × 30 mm region for the plate of the PPWG. The dashed 15.7 × 30 mm region defines the open area of the waveguide. The centered hole pattern is 21 mm × 20 mm, and the total length of the CYLWG is 111.5 mm. The spacers are shown in grey with precisely located punched holes for passage of the connecting screws. Bottom: Standard THz-TDS system.

Image of FIG. 2.
FIG. 2.

Top: Transmitted THz pulses through free-space and the aluminum CYLWG with various gap sizes and through free-space. The measured pulse durations have been cut to show only from 3 to 8 ps for clarity. Bottom: Corresponding amplitude spectra.

Image of FIG. 3.
FIG. 3.

Top: Transmitted THz pulses through the aluminum CYLWG. Bottom: Corresponding amplitude spectra.

Image of FIG. 4.
FIG. 4.

Top: Transmitted THz pulses through the copper CYLWG. Bottom: Corresponding amplitude spectra.

Image of FIG. 5.
FIG. 5.

The measured amplitude absorption coefficients (ACs) for an aluminum CYLWG with different gaps. The dashed lines are the theoretical fits using the strength parameter S from Table I and the dependence. From the top curve, g = 11.9 μm, g = 22.5 μm, g = 50 μm and to the bottom curve g = 100 μm. The upper boundary is AC for each high-lighted curve, and the lower boundary is the relative amplitude absorption coefficient (RAC), relative to the 200 μm gap measurement. RAC = RA/L, where L is the waveguide length of 3 cm and RA = −ln [Atg(ω)/At200(ω)] from Eq. (4). As shown by Eqs. (8) and (9), AC = RAC + AC (g = 200 μm), for which RAC (g = 100 μm) = AC (g = 200 μm). The S/N ratio and the dynamic range of the receiver limits the accuracy of the g = 11.9 μm measurement to 2.0 THz and the g = 22.5 μm measurement to 3.0 THz. The sharp fall-offs beyond these limits are instrumental limitations.

Image of FIG. 6.
FIG. 6.

The measured ACs for a copper CYLWG with different gaps. The dashed lines are the theoretical fits using the strength parameter S from Table I and the dependence. From the top curve, g = 10 μm, g = 23.4 μm, g = 50 μm, and bottom curve g = 100 μm. The upper boundary is AC for each high-lighted curve, and the lower boundary is the RAC, relative to the 200 μm gap measurement. RAC = RA/L, where L is the waveguide length of 3 cm and RA = −ln [Atg(ω)/At200(ω)] from Eq. (4). As shown by Eqs. (8) and (9), AC = RAC + AC (g = 200 μm), for which RAC (g = 100 μm) =AC (g = 200 μm). The S/N ratio and the dynamic range of the receiver limits the accuracy of the g = 10.0 μm measurement to 2.5 THz and the g = 23.4 μm and g = 50 μm measurements to 3.5 THz. The sharp fall-offs beyond these limits are instrumental limitations.

Tables

Generic image for table
Table I.

Measured strength parameters S of the different gaps, given in units of 1/cm. To obtain the absorption coefficient, multiply by in THz. Note that S = α at 1 THz.

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/content/aip/journal/jap/112/7/10.1063/1.4754846
2012-10-01
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Gap independent coupling into parallel plate terahertz waveguides using cylindrical horn antennas
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/7/10.1063/1.4754846
10.1063/1.4754846
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