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Line-defect photonic crystal terahertz quantum cascade laser
Klimont, A.1; Ottomaniello, A.2,3,4; Degl'Innocenti, R.5; Masini, L.2,3; Bianco, F.2,3; Wu, Y.1; Shah, Y. D.1,6; Ren, Y.1,7; Jessop, D. S.1; Tredicucci, A.2,3,4; Beere, H. E.1; Ritchie, D. A.1
2019-10-21
Source PublicationJOURNAL OF APPLIED PHYSICS
ISSN0021-8979
Volume126Issue:15Pages:8
Corresponding AuthorDegl'Innocenti, R.(r.deglinnocenti@lancaster.ac.uk)
AbstractThe terahertz (THz) quantum cascade laser (QCL) provides a versatile tool in a plethora of applications ranging from spectroscopy to astronomy and communications. In many of these fields, compactness, single mode frequency emission, and low threshold are highly desirable. The proposed approach, based on line defects in a photonic crystal (PhC) matrix, addresses all these features while offering unprecedented capabilities in terms of flexibility, light waveguiding, and emission directionality. Nine line-defect QCLs were realized in a triangular lattice of pillars fabricated in the laser active region (AR), centered around similar to 2 THz by tuning the photonic design. A maximal 36% threshold reduction was recorded for these ultraflat dispersion line-defect QCLs in comparison to standard metal-metal QCL. The mode selectivity is an intrinsic property of the chosen fabrication design and has been achieved by lithographically scaling the dimension of the defect pillars and by acting on the PhC parameters in order to match the AR emission bandwidth. The measured line-defect QCLs emitted preferentially in the single frequency mode in the propagation direction throughout the entire dynamic range. An integrated active platform with multiple directional outputs was also fabricated as proof-of-principle to demonstrate the potential of this approach. The presented results pave the way for integrated circuitry operating in the THz regime and for fundamental studies on microcavity lasers. (C) 2019 Author(s).
DOI10.1063/1.5120025
WOS KeywordSLOW-LIGHT ; SPONTANEOUS EMISSION ; WAVE-GUIDE ; OPERATION ; GAIN
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Applied
WOS IDWOS:000503996400009
PublisherAMER INST PHYSICS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35356
Collection中国科学院紫金山天文台
Corresponding AuthorDegl'Innocenti, R.
Affiliation1.Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England
2.CNR, Ist Nanosci, NEST, Piazza San Silvestro 12, I-56127 Pisa, Italy
3.Scuola Normale Super Pisa, Piazza San Silvestro 12, I-56127 Pisa, Italy
4.Univ Pisa, Dipartimento Fis, Largo Pontecorvo 3, I-56127 Pisa, Italy
5.Univ Lancaster, Dept Engn, Lancaster LA1 4YW, England
6.Univ Glasgow, Sch Phys & Astron, Glasgow G12 8SU, Lanark, Scotland
7.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Klimont, A.,Ottomaniello, A.,Degl'Innocenti, R.,et al. Line-defect photonic crystal terahertz quantum cascade laser[J]. JOURNAL OF APPLIED PHYSICS,2019,126(15):8.
APA Klimont, A..,Ottomaniello, A..,Degl'Innocenti, R..,Masini, L..,Bianco, F..,...&Ritchie, D. A..(2019).Line-defect photonic crystal terahertz quantum cascade laser.JOURNAL OF APPLIED PHYSICS,126(15),8.
MLA Klimont, A.,et al."Line-defect photonic crystal terahertz quantum cascade laser".JOURNAL OF APPLIED PHYSICS 126.15(2019):8.
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