1.NEST, CNR - Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
2.School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK
3.Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
Miriam S. Vitiello (miriam.vitiello@sns.it)
纸质出版日期:2020,
网络出版日期:2020-04-09,
收稿日期:2020-01-04,
修回日期:2020-03-06,
录用日期:2020-03-17
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Highly efficient surface-emitting semiconductor lasers exploiting quasi-crystalline distributed feedback photonic patterns[J]. LSA, 2020,9(3):584-594.
Biasco, S. et al. Highly efficient surface-emitting semiconductor lasers exploiting quasi-crystalline distributed feedback photonic patterns. Light: Science & Applications, 9, 584-594 (2020).
Highly efficient surface-emitting semiconductor lasers exploiting quasi-crystalline distributed feedback photonic patterns[J]. LSA, 2020,9(3):584-594. DOI: 10.1038/s41377-020-0294-z.
Biasco, S. et al. Highly efficient surface-emitting semiconductor lasers exploiting quasi-crystalline distributed feedback photonic patterns. Light: Science & Applications, 9, 584-594 (2020). DOI: 10.1038/s41377-020-0294-z.
Quasi-crystal distributed feedback lasers do not require any form
of mirror cavity to amplify and extract radiation. Once implemented on the top surface of a semiconductor laser
a quasi-crystal pattern can be used to tune both the radiation feedback and the extraction of highly radiative and high-quality-factor optical modes that do not have a defined symmetric or anti-symmetric nature. Therefore
this methodology offers the possibility to achieve efficient emission
combined with tailored spectra and controlled beam divergence. Here
we apply this concept to a one-dimensional quantum cascade wire laser. By lithographically patterning a series of air slits with different widths
following the Octonacci sequence
on the top metal layer of a double-metal quantum cascade laser operating at THz frequencies
we can vary the emission from single-frequency-mode to multimode over a 530-GHz bandwidth
achieving a maximum peak optical power of 240 mW (190 mW) in multimode (single-frequency-mode) lasers
with record slope efficiencies for multimode surface-emitting disordered THz lasers up to ≈570 mW/A at 78 K and ≈720 mW/A at 20 K and wall-plug efficiencies of
η
≈ 1%.
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