Frequency tunability of terahertz photonic transmitters

Kao, Tzeng Fu; Chang, Hsu Hao; Chen, Li Jin; Lu, Ja Yu; Liu, An Shyi; Yu, Yi Chun; Wu, Ruey Beei; Liu, Wei Sheng; Chyi, Jen Inn; Sun, Chi‐Kuang

doi:10.1063/1.2176848

Cited by 9 publications

(7 citation statements)

References 10 publications

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“…As shown in Fig. 3(b), a maximum average output power of 0.97 W (corresponding to 1.3-mW peak power and 9-ps pulsewidth) could be achieved at a dc bias of 28 V. The corresponding external (including coupling and collection loss) power conversion efficiency is W mW , which agrees well with our previous results [3], [14], [15].…”

Section: Experimental Setup and Resultssupporting

confidence: 90%

“…We could observe that there was a relatively higher radiation power at 907 GHz, which corresponds to our designed resonant frequency, within the 800-to 1000-GHz range. In addition, a strong resonant frequency at about 500 GHz was also observed and could be attributed to the impedance mismatch at the resonant point [3]. The bias-dependent output power at 907 GHz under a fixed 4.5-mW optical excitation power was also measured.…”

Section: Experimental Setup and Resultsmentioning

confidence: 88%

“…After precisely controlling the delay time of the two arms in a Michelson interferometer, we could control the overlap of two stretched pulses in the time domain and thus controlled the optical beating frequency of our excitation. The tuning range of our excitation frequency was up to 1.1 THz [3]. We focused the coherently controlled optical pulses into the absorption region of the photonic transmitter by a microscope objective.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

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Highly Directed Radiation Pattern From a THz Photonic Transmitter With a Two-Dimensional Rampart Slot Array Antenna

Huang

Kuo

Chiu

et al. 2008

IEEE Photon. Technol. Lett.

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In this study, we investigate the directivity of the terahertz (THz) radiation pattern from a newly designed two-dimensional rampart slot array antenna integrated in an edge-coupled membrane photonic transmitter. The antenna design is based on the array theory which is well-developed in the microwave regime. By means of the array arrangement of rampart slot antennas, we demonstrate that the 3-dB beam width of the THz radiation pattern at 907 GHz is successfully confined within 30 in both H and E planes.

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Section: Experimental Setup and Resultssupporting

confidence: 90%

Section: Experimental Setup and Resultsmentioning

confidence: 88%

Section: Experimental Setup and Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Highly Directed Radiation Pattern From a THz Photonic Transmitter With a Two-Dimensional Rampart Slot Array Antenna

Huang

Kuo

Chiu

et al. 2008

IEEE Photon. Technol. Lett.

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“…6. The THz wave was radiated from a photonic transmitter [27] excited by an optical coherent control system [27] to control the central frequency of radiation. The radiation was collimated and coupled into one end of the fiber by a pair of identical parabolic mirrors (3.82 cm focal length).…”

Section: Attenuation Constant Measurement Of a 200µm Pe Fibermentioning

confidence: 99%

Subwavelength plastic fiber for terahertz wave guiding

Sun

Chen

et al. 2006

SPIE Proceedings

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We report a simple subwavelength-diameter plastic wire, similar to an optical fiber, for guiding terahertz wave with a low attenuation constant. With a large wavelength-to-fiber-core ratio, the fractional power delivered inside the lossy core is reduced, thus lowering the effective fiber attenuation constant. In our experiment, we adopt a polyethylene fiber with a 200-500 µm diameter for guiding terahertz waves in the frequency range of 0.2-0.5 THz in which the attenuation constant is reduced to the order of or less than 0.01 cm -1 . Direct free-space coupling efficiency, as high as 20%, can be achieved by using an off-axis parabolic mirror. Furthermore, all the plastic wires are easily available in our daily life without complex processes and expensive costs.

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“…[6][7][8] The a or materials. F t has also rem Figure 1: Elect ng is a compa tuneable freq toconductor.…”

Section: Introductionmentioning

confidence: 99%

GaN for THz sources

Marso

2011

Quantum Sensing and Nanophotonic Devices VIII

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In this work we investigate two different approaches to generate THz radiation by the use of the unique electrical and thermal properties of GaN. One method is heterodyne photomixing, a compact and inexpensive approach to generate continuous electromagnetic radiation in the terahertz range, with tuneable frequency. It uses two lasers with slightly different wavelengths that illuminate an ultrafast photoconductor. The interference of both laser beams generates a beat frequency of the illumination intensity in the terahertz range. One drawback of the conventionally used LT GaAs as ultrafast photoconductor material is the relatively low THz power in the nW to µW range. The aim of our work is to increase the output power by replacing the LT GaAs with GaN. This semiconductor is rather known as basic material for blue LEDs and lasers, but it has also remarkable electrical and thermal properties that allow higher laser power and bias voltage.A more conventional, electronic approach to generate THz radiation consists in the fabrication of an oscillator circuit based on ultrafast transistors, e.g. Hetero Field Effect Transistors based on InGaAs. These circuits can be designed up to about 100 GHz oscillation frequency. The THz region is achieved by frequency multipliers, e.g. realized by very smallsized Schottky diodes. However, each multiplier stage considerable reduces the output power. In this field we investigate GaN based transistor devices to profit from the much better power performance of this material, compared to classical semiconductors. Devices in this material system are usually used for high power applications at moderate frequencies, but the very high electron saturation velocity of GaN allows the application above 100 GHz as well.

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Frequency tunability of terahertz photonic transmitters

Cited by 9 publications

References 10 publications

Highly Directed Radiation Pattern From a THz Photonic Transmitter With a Two-Dimensional Rampart Slot Array Antenna

Highly Directed Radiation Pattern From a THz Photonic Transmitter With a Two-Dimensional Rampart Slot Array Antenna

Subwavelength plastic fiber for terahertz wave guiding

GaN for THz sources

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