Special Issue "Nonlinear Absorption Properties of Nanomaterials and Their Applications"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Nanotechnology and Applied Nanosciences".

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 3428

Special Issue Editors

Prof. Dr. Ju Han Lee
E-Mail Website1 Website2
Guest Editor
School of Electrical and Computer Engineering, University of Seoul, Dongdaemun-gu, Seoul 02504, Korea
Interests: fiber lasers; ultrafast lasers; nonlinear fiber optics; optical amplifiers; fiber optic sensors
Dr. Yong-Won Song
E-Mail Website
Guest Editor
Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
Interests: functional nanomaterials; material processes; nonlinear optics; ultrafast fiber lasers; optical data management

Special Issue Information

Dear Colleagues,

Intensive investigations into nanomaterials have recently been conducted in terms of fabrication, characterization, and application, since they can provide unique electronic and optical properties which are not readily available with conventional bulk materials. The nanomaterials, which have been at the center of intensive research until now, include carbon nanotubes (CNTs), graphene, topological insulators (TIs), topological semimetal, transition metal dichalcogenides (TMDCs), transition metal monochalcogenides (TMMCs), filled skutterudites (FSs), black phosphorus (BPs), gold nano-particles, and MXenes. In particular, the nonlinear absorption properties of the aforementioned nanomaterials, such as saturable absorption and multi-photon absorption, have been of high technical interest, since they allow for the realization of absorption-related functional devices such as saturable absorbers (SAs) and multi-photon absorption devices. This Special Issue aims at highlighting the recent technical progress in investigating nonlinear absorption properties of emerging nanomaterials and development of the associated functional devices.

Prof. Dr. Ju Han Lee
Dr. Yong-Won Song
Guest Editors

Manuscript Submission Information

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Keywords

  • nonlinear optical properties
  • saturable absorption
  • multi-photon absorption
  • nanomaterials
  • 2D materials
  • transition metal dichalcogenides
  • topological insulators
  • topological semimetals
  • MXenes
  • metal nanoparticles
  • saturable absorbers for ultrafast lasers
  • multi-photon absorption-based devices

Published Papers (4 papers)

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Research

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Article
Broadband Metallic Carbon Nanotube Saturable Absorber for Ultrashort Pulse Generation in the 1500–2100 nm Spectral Range
Appl. Sci. 2021, 11(7), 3121; https://doi.org/10.3390/app11073121 - 01 Apr 2021
Viewed by 645
Abstract
Herein, we report on the possibility of ultrashort laser pulse generation in the broadband spectral range using a saturable absorber based on free-standing metallic carbon nanotube thin film. Erbium, thulium, and holmium-doped all-fiber lasers were mode-locked with a single saturable absorber containing a [...] Read more.
Herein, we report on the possibility of ultrashort laser pulse generation in the broadband spectral range using a saturable absorber based on free-standing metallic carbon nanotube thin film. Erbium, thulium, and holmium-doped all-fiber lasers were mode-locked with a single saturable absorber containing a 300 nm thick material layer. Subpicosecond pulses were generated at 1559, 1938, and 2082 nm. Our work validates the broadband operation of metallic carbon nanotube-based saturable absorbers and highlights the suitable performance of nanomatematerial for ultrafast photonic applications. Full article
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Article
A Passively Q-Switched Holmium-Doped Fiber Laser with Graphene Oxide at 2058 nm
Appl. Sci. 2021, 11(1), 407; https://doi.org/10.3390/app11010407 - 04 Jan 2021
Cited by 4 | Viewed by 898
Abstract
This study reports a Q-switching-based, 2058-nm holmium (Ho) fiber laser incorporating a saturable absorber (SA) based on graphene oxide (GO). The SA was prepared with a side-polished fiber, while GO particles were deposited onto the fiber-polished surface to realize an all-fiber SA. A [...] Read more.
This study reports a Q-switching-based, 2058-nm holmium (Ho) fiber laser incorporating a saturable absorber (SA) based on graphene oxide (GO). The SA was prepared with a side-polished fiber, while GO particles were deposited onto the fiber-polished surface to realize an all-fiber SA. A continuous-wave thulium-doped all-fiber laser, which was configured with a master-oscillator power-amplifier (MOPA) structure, was constructed as a pumping source. By inserting the fabricated SA into an all-fiber ring resonator based on 1-m length of Ho-doped fiber, Q-switched pulses could readily be obtained at a wavelength of 2058 nm. The pulse width was observed to vary from 2.01 to 1.56 μs as the pump power was adjusted from ~759 to 1072 mW, while the repetition rate was tunable from 45.56 to 56.12 kHz. The maximum values of average optical power and pulse energy were measured as ~11.61 mW and 207.05 nJ, respectively, at a ~1072 mW pump power. Full article
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Review

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Review
Directly Synthesized Graphene-Based Photonics and Optoelectronics Devices
Appl. Sci. 2021, 11(6), 2768; https://doi.org/10.3390/app11062768 - 19 Mar 2021
Cited by 2 | Viewed by 823
Abstract
In the past two decades, extensive research and studies have been performed on graphene because of its exceptional physical properties. Owing to its ultrahigh carrier mobility, quantum Hall effect and unique optical transmittance, graphene is considered to be a multi-functional component for realizing [...] Read more.
In the past two decades, extensive research and studies have been performed on graphene because of its exceptional physical properties. Owing to its ultrahigh carrier mobility, quantum Hall effect and unique optical transmittance, graphene is considered to be a multi-functional component for realizing next-generation optoelectronic and photonic devices. Significant efforts have been made towards efficient synthesis, transfer, and integration of graphene for use in device scale. However, the critical hurdles lie in developing 3D and conformal graphene, which are ideal for integrated hybrid photonic systems. Here, we review different methods of synthesizing graphene, specifically recent advances in the synthesis of direct, conformal, 3D graphene. In addition, we comprehensively summarize the latest progress made towards directly grown, 3D, conformal graphene-based photonic and optoelectronic applications. Finally, several important challenges for large-sale implementation of directly grown graphene-based optoelectronic and photonic devices are discussed. Full article
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Review
Saturable Absorption Dynamics of Highly Stacked 2D Materials for Ultrafast Pulsed Laser Production
Appl. Sci. 2021, 11(6), 2690; https://doi.org/10.3390/app11062690 - 17 Mar 2021
Cited by 2 | Viewed by 703
Abstract
This review summarizes recent developments of saturable absorbers (SAs) based on 2D materials for nonlinear optical absorption and ultrafast pulsed laser generation. Apart from graphene, various 2D materials such as topological insulators and transition metal dichalcogenides are investigated for SA applications and their [...] Read more.
This review summarizes recent developments of saturable absorbers (SAs) based on 2D materials for nonlinear optical absorption and ultrafast pulsed laser generation. Apart from graphene, various 2D materials such as topological insulators and transition metal dichalcogenides are investigated for SA applications and their important potential as passive mode-lockers for femtosecond laser production are extensively investigated. By selecting appropriate 2D materials, a wide spectral range of passively mode-locked pulsed lasers are obtained, covering visible, midinfrared and a terahertz region. A set of different approaches is used for fabricating SA modules of fiber laser photonics, which include sandwiching, side-polishing and tapering methods. Noticeably, through systematic studies, it is demonstrated that layer-stacking seldom deteriorates the SA performance of 2D materials in the evanescent regime, although their ultrathin nature may improve the efficiency in a transmission mode like sandwich-type SAs. The direction for designing new SAs is presented based on material characterization. Full article
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