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(Color online) (a) Micrograph of terahertz array antenna device. (b) Cross-sectional view of terahertz antenna array.
(Color online) Time-resolved scans of terahertz pulse for array emitter (dark line) and single element (light line) and their respective spectra in inlay.
(Color online) Calculated radiation pattern for dipole (black solid line) and measured single element radiation pattern (dashed line). Array radiation pattern calculated based on array theory (light solid line) and measurement (dotted). Inlay: experimental setup with fiber coupled and dispersion compensated (FC) receiver for radiation pattern measurement.
(Color online) Saturation curve for (a) single element (focused optical spot, marks failure point of the device), (b) reference excitation spot (spot size adjusted to maximize terahertz amplitude at low excitation power), and (c) array with large excitation spot compared to reference spot (spot size adjusted to maximize terahertz amplitude at high excitation power).
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