Coupling terahertz radiation between sub-wavelength metal-metal waveguides and free space using monolithically integrated horn antennae | Zendy

James LloydHughes | Zendy; Giacomo Scalari | Zendy; A. van Kolck | Zendy; Milan Fischer | Zendy; Mattias Beck | Zendy; Jérôme Faist | Zendy

Open Access

Coupling terahertz radiation between sub-wavelength metal-metal waveguides and free space using monolithically integrated horn antennae

Author(s) -

James LloydHughes,

Giacomo Scalari,

A. van Kolck,

Milan Fischer,

Mattias Beck,

Jérôme Faist

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.018387

Subject(s) - terahertz radiation , optics , photomixing , laser , terahertz spectroscopy and technology , optoelectronics , materials science , far infrared laser , picosecond , terahertz gap , wavelength , terahertz time domain spectroscopy , physics , terahertz metamaterials

Broadband horn antennae are presented that efficiently couple terahertz radiation between sub-wavelength metal-metal waveguides and free space. Sub-picosecond terahertz pulses were coupled into and out from sub-wavelength parallel-plate waveguides by using the horn antennae in a terahertz time-domain spectrometer. Monolithic antennae were fabricated at the facets of metal-metal terahertz quantum cascade lasers, and laser action was observed for devices emitting at 1.4 THz, 2.3 THz and 3.2 THz. A good far-field laser radiation pattern (FWHM less than 11 degrees) is obtained as a result of the significant expansion of the optical mode by the antenna.

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