Ultrafast terahertz saturable absorbers using tailored intersubband polaritons
| Autor: | Nils Dessmann, A. Giles Davies, Christoph Lange, Francesco P. Mezzapesa, Miriam S. Vitiello, Jürgen Raab, Leonardo Viti, Lianhe Li, Laura K. Diebel, Rupert Huber, Edmund H. Linfield |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Materials science Terahertz radiation Science Population 610 Medizin General Physics and Astronomy Quantum cascade lasers Polaritons Physics::Optics 02 engineering and technology General Biochemistry Genetics and Molecular Biology Article law.invention 03 medical and health sciences law Polariton education lcsh:Science Quantum Terahertz optics education.field_of_study ddc:610 Multidisciplinary business.industry Condensed Matter::Other Electronics photonics and device physics Saturable absorption General Chemistry 021001 nanoscience & nanotechnology Laser 530 Physik 030104 developmental biology Optoelectronics lcsh:Q Photonics 0210 nano-technology business Ultrashort pulse |
| Zdroj: | Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020) Nature Communications Nature communications 11 (2020). doi:10.1038/s41467-020-18004-8 info:cnr-pdr/source/autori:Raab J.; Mezzapesa F.P.; Viti L.; Dessmann N.; Diebel L.K.; Li L.; Davies A.G.; Linfield E.H.; Lange C.; Huber R.; Vitiello M.S./titolo:Ultrafast terahertz saturable absorbers using tailored intersubband polaritons/doi:10.1038%2Fs41467-020-18004-8/rivista:Nature communications/anno:2020/pagina_da:/pagina_a:/intervallo_pagine:/volume:11 |
| ISSN: | 2041-1723 |
| Popis: | Semiconductor heterostructures have enabled a great variety of applications ranging from GHz electronics to photonic quantum devices. While nonlinearities play a central role for cutting-edge functionality, they require strong field amplitudes owing to the weak light-matter coupling of electronic resonances of naturally occurring materials. Here, we ultrastrongly couple intersubband transitions of semiconductor quantum wells to the photonic mode of a metallic cavity in order to custom-tailor the population and polarization dynamics of intersubband cavity polaritons in the saturation regime. Two-dimensional THz spectroscopy reveals strong subcycle nonlinearities including six-wave mixing and a collapse of light-matter coupling within 900 fs. This collapse bleaches the absorption, at a peak intensity one order of magnitude lower than previous all-integrated approaches and well achievable by state-of-the-art QCLs, as demonstrated by a saturation of the structure under cw-excitation. We complement our data by a quantitative theory. Our results highlight a path towards passively mode-locked QCLs based on polaritonic saturable absorbers in a monolithic single-chip design. Structures that can enhance the capabilities of quantum cascade lasers are highly sought after to improve their practicality for a range of applications. Here the authors demonstrate such a structure in a saturable absorber that takes advantage of intersubband polaritons in the terahertz range and study coherent nonlinear dynamics in the system. |
| Databáze: | OpenAIRE |
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