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Arrayed Telecom-Wavelength Compatible THz n-i-pn-i-p Super lattice Photomixers for Spectroscopy Applications

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Preu,  S.
Max Planck Fellow Group, Max Planck Institute for the Science of Light, Max Planck Society;
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;

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Bauerschmidt,  S.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;

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Malzer,  S.
Guests, Max Planck Institute for the Science of Light, Max Planck Society;

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Wang,  L. J.
Max Planck Fellow Group, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Preu, S., Bauerschmidt, S., Malzer, S., Doehler, G. H., Lu, H., Gossard, A. C., et al. (2011). Arrayed Telecom-Wavelength Compatible THz n-i-pn-i-p Super lattice Photomixers for Spectroscopy Applications. In TERAHERTZ AND MID INFRARED RADIATION: GENERATION, DETECTION AND APPLICATIONS (pp. 139-146). PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS: SPRINGER.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6A71-4
Abstract
We report on the progress of room-temperature operating, continuous-wave, tunable n-i-pn-i-p superlattice THz photomixers, compatible with 1.55 mu m telecom laser systems. An output power of 0.65 mu W at 1 THz has been achieved at a photocurrent of 9.5 mA, using a broadband antenna. The spectral power is at a level where high resolution spectroscopy becomes attractive. This is demonstrated by measuring the absorption spectrum of water vapor between 0.4 and 1.6 THz. We constructed an array of 4 mutually coherent photomixers for higher output power and spatial resolution. The interference of the four individual beams was measured in the target plane at a stand-off distance of 4.2 m. We report on both a small THz spot diameter along the array axis of < 1 cm for v > 0.3 THz and a high intensity of the central interference peak, in excellent agreement with numerical simulations. These features are very attractive for stand-off imaging and spectroscopy.