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Title: Dependence of the saturable absorption of graphene upon excitation photon energy

Abstract

Using an optical parametric oscillation laser as the excitation source, the dependence of the saturable absorption of multiple-layer graphene upon photon energy is investigated and, in all cases, the saturation intensity is lower for lower excitation photon energy. This result experimentally proves the hourglass shape of the energy band of graphene, which is a well-known theoretical deduction from first principles. The modulation depth increases from 1.5% to 5.1% when the layer number increases from a monolayer to 5–7 layers and, at the same time, the saturation intensity decreases with increasing number of layers. The results demonstrate that, as a saturable absorber of a pulsed laser, graphene can more easily achieve optical modulation in the low energy region, i.e., the infrared waveband.

Authors:
; ; ; ;  [1];  [2]
  1. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22412737
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ELECTROMAGNETIC PULSES; EXCITATION; GRAPHENE; LASERS; LAYERS; MODULATION; OSCILLATIONS; PHOTONS

Citation Formats

Zhang, Fang, Han, Shuo, Liu, Yanqing, Wang, Zhengping, E-mail: zpwang@sdu.edu.cn, Xu, Xinguang, and Key Laboratory of Functional Crystal Materials and Devices, Shandong University, Ministry of Education, Jinan 250100. Dependence of the saturable absorption of graphene upon excitation photon energy. United States: N. p., 2015. Web. doi:10.1063/1.4913607.
Zhang, Fang, Han, Shuo, Liu, Yanqing, Wang, Zhengping, E-mail: zpwang@sdu.edu.cn, Xu, Xinguang, & Key Laboratory of Functional Crystal Materials and Devices, Shandong University, Ministry of Education, Jinan 250100. Dependence of the saturable absorption of graphene upon excitation photon energy. United States. doi:10.1063/1.4913607.
Zhang, Fang, Han, Shuo, Liu, Yanqing, Wang, Zhengping, E-mail: zpwang@sdu.edu.cn, Xu, Xinguang, and Key Laboratory of Functional Crystal Materials and Devices, Shandong University, Ministry of Education, Jinan 250100. Mon . "Dependence of the saturable absorption of graphene upon excitation photon energy". United States. doi:10.1063/1.4913607.
@article{osti_22412737,
title = {Dependence of the saturable absorption of graphene upon excitation photon energy},
author = {Zhang, Fang and Han, Shuo and Liu, Yanqing and Wang, Zhengping, E-mail: zpwang@sdu.edu.cn and Xu, Xinguang and Key Laboratory of Functional Crystal Materials and Devices, Shandong University, Ministry of Education, Jinan 250100},
abstractNote = {Using an optical parametric oscillation laser as the excitation source, the dependence of the saturable absorption of multiple-layer graphene upon photon energy is investigated and, in all cases, the saturation intensity is lower for lower excitation photon energy. This result experimentally proves the hourglass shape of the energy band of graphene, which is a well-known theoretical deduction from first principles. The modulation depth increases from 1.5% to 5.1% when the layer number increases from a monolayer to 5–7 layers and, at the same time, the saturation intensity decreases with increasing number of layers. The results demonstrate that, as a saturable absorber of a pulsed laser, graphene can more easily achieve optical modulation in the low energy region, i.e., the infrared waveband.},
doi = {10.1063/1.4913607},
journal = {Applied Physics Letters},
number = 9,
volume = 106,
place = {United States},
year = {Mon Mar 02 00:00:00 EST 2015},
month = {Mon Mar 02 00:00:00 EST 2015}
}