期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 52, 页码 E5623-E5632出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1421991112
关键词
quantum cascade laser; terahertz; circular polarization control; antenna grating; surface emission
资金
- Engineering and Physical Sciences Research Council
- European Research Council program TOSCA
- Engineering and Physical Sciences Research Council [EP/J005282/1, EP/J017671/1] Funding Source: researchfish
- EPSRC [EP/J017671/1, EP/J005282/1] Funding Source: UKRI
We demonstrate surface emission of terahertz (THz) frequency radiation from a monolithic quantum cascade laser with built-in control over the degree of circular polarization by fishbone gratings composed of orthogonally oriented aperture antennas. Different grating concepts for circularly polarized emission are introduced along with the presentation of simulations and experimental results. Fifth-order gratings achieve a degree of circular polarization of up to 86% within a 12 degrees-wide core region of their emission lobes in the far field. For devices based on an alternative transverse grating design, degrees of circular polarization as high as 98% are demonstrated for selected far-field regions of the outcoupled THz radiation and within a collection half-angle of about 6 degrees. Potential and limitations of integrated antenna gratings for polarization-controlled emission are discussed.
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