Projects per year
Abstract
Strong-field photoemission produces attosecond (10−18 s) electron pulses that are synchronized to the waveform of the incident light. This nonlinear photoemission lies at the heart of current attosecond technologies. Here we report a new nonlinear photoemission behaviour—the nonlinearity in strong-field regime sharply increases (approaching 40th power-law scaling), making use of sub-nanometric carbon nanotubes and 800 nm pulses. As a result, the carrier-envelope phase sensitive photoemission current shows a greatly improved modulation depth of up to 100% (with a total modulation current up to 2 nA). The calculations reveal that the behaviour is an interplay of valence band optical-field emission with charge interaction, and the nonlinear dynamics can be tunable by changing the bandgap of carbon nanotubes. The extreme nonlinear photoemission offers a new means of producing extreme temporal-spatial resolved electron pulses, and provides a new design philosophy for attosecond electronics and photonics.
Original language | English |
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Article number | 4891 |
Journal | Nature Communications |
Volume | 10 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Dec 2019 |
MoE publication type | A1 Journal article-refereed |
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ATOP: Atomically-engineered nonlinear photonics with two-dimensional layered material superlattices
Sun, Z., Dai, Y., Liapis, A., Nigmatulin, F., Wang, Y., Zhang, Z., Pelgrin, V., Wang, Y., Das, S., Du, M., Yoon, H. H. & Uddin, M.
01/09/2019 → 31/08/2024
Project: EU: ERC grants
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PREIN: Photonics Research and Innovation
01/01/2019 → 31/12/2022
Project: Academy of Finland: Other research funding
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A-Photonics
Sun, Z., Hedberg, D., Dai, Y., Du, M., Kim, M., Pyymaki Perros, A., Lau Kuen Yao, L. & Rajamanickam, R.
01/01/2019 → 31/12/2020
Project: Business Finland: New business from research ideas (TUTLI)