[{"date_created":"2019-01-09T10:00:23Z","department":[{"_id":"230"}],"keyword":["Atomically thin 2D materials","carrier and phonon dynamics","ultrafast spectroscopy"],"type":"journal_article","issue":"2","publication":"Nano Letters","abstract":[{"text":"Transient changes of the optical response of WS2 monolayers are studied by femtosecond broadband pump–probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate.","lang":"eng"}],"language":[{"iso":"eng"}],"doi":"10.1021/acs.nanolett.6b03513","author":[{"first_name":"Claudia","last_name":"Ruppert","full_name":"Ruppert, Claudia"},{"last_name":"Chernikov","first_name":"Alexey","full_name":"Chernikov, Alexey"},{"full_name":"Hill, Heather M.","last_name":"Hill","first_name":"Heather M."},{"first_name":"Albert F.","last_name":"Rigosi","full_name":"Rigosi, Albert F."},{"full_name":"Heinz, Tony F.","last_name":"Heinz","first_name":"Tony F."}],"publication_identifier":{"issn":["1530-6984","1530-6992"]},"title":"The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation","year":"2017","intvolume":"        17","article_type":"original","date_updated":"2022-01-06T07:03:11Z","publication_status":"published","citation":{"short":"C. Ruppert, A. Chernikov, H.M. Hill, A.F. Rigosi, T.F. Heinz, Nano Letters 17 (2017) 644–651.","chicago":"Ruppert, Claudia, Alexey Chernikov, Heather M. Hill, Albert F. Rigosi, and Tony F. Heinz. “The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation.” <i>Nano Letters</i> 17, no. 2 (2017): 644–51. <a href=\"https://doi.org/10.1021/acs.nanolett.6b03513\">https://doi.org/10.1021/acs.nanolett.6b03513</a>.","apa":"Ruppert, C., Chernikov, A., Hill, H. M., Rigosi, A. F., &#38; Heinz, T. F. (2017). The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation. <i>Nano Letters</i>, <i>17</i>(2), 644–651. <a href=\"https://doi.org/10.1021/acs.nanolett.6b03513\">https://doi.org/10.1021/acs.nanolett.6b03513</a>","ieee":"C. Ruppert, A. Chernikov, H. M. Hill, A. F. Rigosi, and T. F. Heinz, “The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation,” <i>Nano Letters</i>, vol. 17, no. 2, pp. 644–651, 2017.","ama":"Ruppert C, Chernikov A, Hill HM, Rigosi AF, Heinz TF. The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation. <i>Nano Letters</i>. 2017;17(2):644-651. doi:<a href=\"https://doi.org/10.1021/acs.nanolett.6b03513\">10.1021/acs.nanolett.6b03513</a>","bibtex":"@article{Ruppert_Chernikov_Hill_Rigosi_Heinz_2017, title={The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation}, volume={17}, DOI={<a href=\"https://doi.org/10.1021/acs.nanolett.6b03513\">10.1021/acs.nanolett.6b03513</a>}, number={2}, journal={Nano Letters}, publisher={American Chemical Society (ACS)}, author={Ruppert, Claudia and Chernikov, Alexey and Hill, Heather M. and Rigosi, Albert F. and Heinz, Tony F.}, year={2017}, pages={644–651} }","mla":"Ruppert, Claudia, et al. “The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation.” <i>Nano Letters</i>, vol. 17, no. 2, American Chemical Society (ACS), 2017, pp. 644–51, doi:<a href=\"https://doi.org/10.1021/acs.nanolett.6b03513\">10.1021/acs.nanolett.6b03513</a>."},"project":[{"name":"TRR 142","_id":"53"},{"_id":"54","name":"TRR 142 - Project Area A"},{"name":"TRR 142 - Subproject A1","_id":"58"}],"_id":"6542","publisher":"American Chemical Society (ACS)","page":"644-651","volume":17,"user_id":"49428","status":"public"},{"status":"public","user_id":"49428","volume":56,"page":"3104-3108","_id":"6543","publisher":"OSA","project":[{"name":"TRR 142","_id":"53"},{"name":"TRR 142 - Project Area A","_id":"54"},{"_id":"58","name":"TRR 142 - Subproject A1"}],"citation":{"chicago":"Mundry, J., J. Lohrenz, and M. Betz. “Tunable Femtosecond Near-IR Source by Pumping an OPA Directly with a 90 MHz Yb:Fiber Source.” <i>Applied Optics</i> 56, no. 11 (2017): 3104–8. <a href=\"https://doi.org/10.1364/AO.56.003104\">https://doi.org/10.1364/AO.56.003104</a>.","short":"J. Mundry, J. Lohrenz, M. Betz, Applied Optics 56 (2017) 3104–3108.","ieee":"J. Mundry, J. Lohrenz, and M. Betz, “Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz Yb:fiber source,” <i>Applied Optics</i>, vol. 56, no. 11, pp. 3104–3108, 2017.","apa":"Mundry, J., Lohrenz, J., &#38; Betz, M. (2017). Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz Yb:fiber source. <i>Applied Optics</i>, <i>56</i>(11), 3104–3108. <a href=\"https://doi.org/10.1364/AO.56.003104\">https://doi.org/10.1364/AO.56.003104</a>","bibtex":"@article{Mundry_Lohrenz_Betz_2017, title={Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz Yb:fiber source}, volume={56}, DOI={<a href=\"https://doi.org/10.1364/AO.56.003104\">10.1364/AO.56.003104</a>}, number={11}, journal={Applied Optics}, publisher={OSA}, author={Mundry, J. and Lohrenz, J. and Betz, M.}, year={2017}, pages={3104–3108} }","ama":"Mundry J, Lohrenz J, Betz M. Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz Yb:fiber source. <i>Applied Optics</i>. 2017;56(11):3104-3108. doi:<a href=\"https://doi.org/10.1364/AO.56.003104\">10.1364/AO.56.003104</a>","mla":"Mundry, J., et al. “Tunable Femtosecond Near-IR Source by Pumping an OPA Directly with a 90 MHz Yb:Fiber Source.” <i>Applied Optics</i>, vol. 56, no. 11, OSA, 2017, pp. 3104–08, doi:<a href=\"https://doi.org/10.1364/AO.56.003104\">10.1364/AO.56.003104</a>."},"date_updated":"2022-01-06T07:03:11Z","article_type":"original","intvolume":"        56","title":"Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz Yb:fiber source","year":"2017","author":[{"first_name":"J.","last_name":"Mundry","full_name":"Mundry, J."},{"first_name":"J.","last_name":"Lohrenz","full_name":"Lohrenz, J."},{"full_name":"Betz, M.","last_name":"Betz","first_name":"M."}],"doi":"10.1364/AO.56.003104","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Up to 400 mW of near-IR (1370-1500 nm) femtosecond pulses are generated from an optical parametric amplifier directly driven by a Yb:fiber oscillator delivering 100\\&\\#x00A0;fs pulses at 1036 nm. The process is seeded by a stable supercontinuum obtained from a photonic crystal fiber. We use a single pass through a 3 mm, magnesium oxide-doped, periodically poled LiNbO3 downconversion crystal to produce a near-IR pulse train with a remarkable power stability of 1.4 % (RMS) during one hour. Tuning is achieved by the temperature and the poling period of the nonlinear crystal."}],"publication":"Applied Optics","issue":"11","type":"journal_article","keyword":["Infrared and far-infrared lasers","Ultrafast lasers","Nonlinear optics","parametric processes","Parametric oscillators and amplifiers","Femtosecond pulses","Fiber lasers","Fused silica","Laser systems","Photonic crystal fibers","Pulse propagation"],"department":[{"_id":"230"}],"date_created":"2019-01-09T10:06:44Z"}]