Multimode, Aperiodic Terahertz Surface-Emitting Laser Resonators
Quasi-crystal structures are conventionally built following deterministic generation rules although they do not present a full spatial periodicity. If used as laser resonators, they open up intriguing design possibilities that are simply not possible in conventional periodic photonic crystals: the d...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2016-05-01
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| Series: | Photonics |
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| Online Access: | http://www.mdpi.com/2304-6732/3/2/32 |
| _version_ | 1811263198525915136 |
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| author | Simone Biasco Lianhe Li Edmund H. Linfield A. Giles Davies Miriam S. Vitiello |
| author_facet | Simone Biasco Lianhe Li Edmund H. Linfield A. Giles Davies Miriam S. Vitiello |
| author_sort | Simone Biasco |
| collection | DOAJ |
| description | Quasi-crystal structures are conventionally built following deterministic generation rules although they do not present a full spatial periodicity. If used as laser resonators, they open up intriguing design possibilities that are simply not possible in conventional periodic photonic crystals: the distinction between symmetric (vertically radiative but low quality factor Q) and anti-symmetric (non-radiative, high Q) modes is indeed here fully overcome, offering a concrete perspective of highly efficient vertical emitting resonators. We here exploit electrically pumped terahertz quantum cascade heterostructures to devise two-dimensional seven-fold quasi-crystal resonators, exploiting rotational order or irregularly distributed defects. By lithographically tuning the lattice quasi-periodicity and/or the hole radius of the imprinted patterns, efficient multimode surface emission with a rich sequence of spectral lines distributed over a 2.9–3.4 THz bandwidth was reached. We demonstrated multicolor emission with 67 mW of peak optical power, slope efficiencies up to ≈70 mW/A, 0.14% wall plug efficiencies and beam profile results of the rich quasi-crystal Fourier spectrum that, in the case of larger rotational order, can reach very low divergence. |
| first_indexed | 2024-04-12T19:40:22Z |
| format | Article |
| id | doaj.art-ff3848e7ec57492da6feabdc914a78ff |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-04-12T19:40:22Z |
| publishDate | 2016-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-ff3848e7ec57492da6feabdc914a78ff2022-12-22T03:19:06ZengMDPI AGPhotonics2304-67322016-05-01323210.3390/photonics3020032photonics3020032Multimode, Aperiodic Terahertz Surface-Emitting Laser ResonatorsSimone Biasco0Lianhe Li1Edmund H. Linfield2A. Giles Davies3Miriam S. Vitiello4NEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, ItalySchool of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UKSchool of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UKSchool of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UKNEST, CNR—Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, ItalyQuasi-crystal structures are conventionally built following deterministic generation rules although they do not present a full spatial periodicity. If used as laser resonators, they open up intriguing design possibilities that are simply not possible in conventional periodic photonic crystals: the distinction between symmetric (vertically radiative but low quality factor Q) and anti-symmetric (non-radiative, high Q) modes is indeed here fully overcome, offering a concrete perspective of highly efficient vertical emitting resonators. We here exploit electrically pumped terahertz quantum cascade heterostructures to devise two-dimensional seven-fold quasi-crystal resonators, exploiting rotational order or irregularly distributed defects. By lithographically tuning the lattice quasi-periodicity and/or the hole radius of the imprinted patterns, efficient multimode surface emission with a rich sequence of spectral lines distributed over a 2.9–3.4 THz bandwidth was reached. We demonstrated multicolor emission with 67 mW of peak optical power, slope efficiencies up to ≈70 mW/A, 0.14% wall plug efficiencies and beam profile results of the rich quasi-crystal Fourier spectrum that, in the case of larger rotational order, can reach very low divergence.http://www.mdpi.com/2304-6732/3/2/32Terahertzquantum cascade lasersquasi-crystals |
| spellingShingle | Simone Biasco Lianhe Li Edmund H. Linfield A. Giles Davies Miriam S. Vitiello Multimode, Aperiodic Terahertz Surface-Emitting Laser Resonators Photonics Terahertz quantum cascade lasers quasi-crystals |
| title | Multimode, Aperiodic Terahertz Surface-Emitting Laser Resonators |
| title_full | Multimode, Aperiodic Terahertz Surface-Emitting Laser Resonators |
| title_fullStr | Multimode, Aperiodic Terahertz Surface-Emitting Laser Resonators |
| title_full_unstemmed | Multimode, Aperiodic Terahertz Surface-Emitting Laser Resonators |
| title_short | Multimode, Aperiodic Terahertz Surface-Emitting Laser Resonators |
| title_sort | multimode aperiodic terahertz surface emitting laser resonators |
| topic | Terahertz quantum cascade lasers quasi-crystals |
| url | http://www.mdpi.com/2304-6732/3/2/32 |
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