1
|
Ai R, Xia X, Zhang H, Chui KK, Wang J. Orientation-Dependent Interaction between the Magnetic Plasmons in Gold Nanocups and the Excitons in WS 2 Monolayer and Multilayer. ACS NANO 2023; 17:2356-2367. [PMID: 36662164 PMCID: PMC9933610 DOI: 10.1021/acsnano.2c09099] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 01/17/2023] [Indexed: 06/17/2023]
Abstract
The integration of two-dimensional transition metal dichalcogenides with plasmonic nanostructures is extremely attractive for the investigation of the resonance coupling between plasmons and excitons, which offers a framework for the study of cavity quantum electrodynamics and is of great potential for exploring diverse quantum technologies. Herein we report on the coupling between the magnetic plasmons supported by individual asymmetric Au nanocups and the excitons in WS2 monolayer and multilayer. Resonance coupling with the strength varying from weak to strong regimes is realized by adjusting the orientation of the individual Au nanocups on WS2 monolayer. Different energy detunings between the magnetic plasmons and the excitons are achieved by varying the size of the Au nanocup. The Rabi splitting energies extracted at zero detuning are up to 106 meV. The anticrossing feature is observed in the measured scattering spectra and simulated absorption spectra, which indicates that the resonance coupling between the magnetic plasmons in the Au nanocup and the excitons in WS2 monolayer enters the strongly coupled regime. A dependence of the coupling strength on the layer number is further observed when the Au nanocups are coupled with WS2 multilayer. Our study suggests a promising approach toward the realization of different coupling regimes in a simple hybrid system made of individual Au nanocups and two-dimensional materials.
Collapse
Affiliation(s)
- Ruoqi Ai
- Department
of Physics, The Chinese University of Hong
Kong, Shatin, Hong Kong SAR999077, China
| | - Xinyue Xia
- Department
of Physics, The Chinese University of Hong
Kong, Shatin, Hong Kong SAR999077, China
| | - Han Zhang
- School
of Materials Science and Engineering, Zhejiang
Sci-Tech University, Hangzhou310018, China
| | - Ka Kit Chui
- Department
of Physics, The Chinese University of Hong
Kong, Shatin, Hong Kong SAR999077, China
| | - Jianfang Wang
- Department
of Physics, The Chinese University of Hong
Kong, Shatin, Hong Kong SAR999077, China
| |
Collapse
|
2
|
Villani M, Rossi F, Calestani D, Salviati G, Fabbri F. Evaluating the plasmon-exciton interaction in ZnO tetrapods coupled with gold nanostructures by nanoscale cathodoluminescence. NANO EXPRESS 2021. [DOI: 10.1088/2632-959x/abe277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
Plasmon-exciton coupling is gaining increasing interest for enhancing the performance of optoelectronic, photonic and photo-catalytic devices. Herein we evaluate the interaction of excitons in zinc oxide tetrapods with surface plasmons of gold nanostructures with different morphologies. The gold nanostructures are grown in situ on ZnO tetrapods by means of a photochemical process, resulting in clean interfaces. The modification of the synthesis parameters results in different morphologies, as isolated nanoparticles, nano-domes or nanoparticles aggregates. Plasmon-exciton interaction is evaluated by means of cathodoluminescence spectroscopy and mapping at the nanoscale. The ZnO excitonic emission is strongly blue-shifted and broadened in close proximity of the gold nanostructures. This effect is explained by the formation of a Schottky barrier that is strongly mediated by the morphology of metal nanostructures.
Collapse
|
3
|
Suppressing material loss in the visible and near-infrared range for functional nanophotonics using bandgap engineering. Nat Commun 2020; 11:5055. [PMID: 33028825 PMCID: PMC7542432 DOI: 10.1038/s41467-020-18793-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Accepted: 09/07/2020] [Indexed: 11/16/2022] Open
Abstract
All-dielectric nanostructures have recently opened exciting opportunities for functional nanophotonics, owing to their strong optical resonances along with low material loss in the near-infrared range. Pushing these concepts to the visible range is hindered by their larger absorption coefficient, thus encouraging the search for alternative dielectrics for nanophotonics. Here, we employ bandgap engineering to synthesize hydrogenated amorphous Si nanoparticles (a-Si:H NPs) offering ideal features for functional nanophotonics. We observe significant material loss suppression in a-Si:H NPs in the visible range caused by hydrogenation-induced bandgap renormalization, producing strong higher-order resonant modes in single NPs with Q factors up to ~100 in the visible and near-IR range. We also realize highly tunable all-dielectric meta-atoms by coupling a-Si:H NPs to photochromic spiropyran molecules. ~70% reversible all-optical tuning of light scattering at the higher-order resonant mode under a low incident light intensity is demonstrated. Our results promote the development of high-efficiency visible nanophotonic devices. Large absorption of high-index semiconductors has hindered the application of all dielectric nanostructures in the visible range. Here, the authors present bandgap-engineered hydrogenated amorphous Si nanoparticles with Q-factors up to 100 and their integration with photochromic molecules as tunable meta-atoms.
Collapse
|
4
|
Munkhbat B, Baranov DG, Bisht A, Hoque MA, Karpiak B, Dash SP, Shegai T. Electrical Control of Hybrid Monolayer Tungsten Disulfide-Plasmonic Nanoantenna Light-Matter States at Cryogenic and Room Temperatures. ACS NANO 2020; 14:1196-1206. [PMID: 31904217 DOI: 10.1021/acsnano.9b09684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Hybrid light-matter states-polaritons-have attracted considerable scientific interest recently, motivated by their potential for development of nonlinear and quantum optical schemes. To realize such states, monolayer transition metal dichalcogenides (TMDCs) have been widely employed as excitonic materials. In addition to neutral excitons, TMDCs host charged excitons, which enables active tuning of hybrid light-matter states by electrical means. Although several reports demonstrated charged exciton-polaritons in various systems, the full-range interaction control attainable at room temperature has not been realized. Here, we demonstrate electrically tunable charged exciton-plasmon polaritons in a hybrid tungsten disulfide (WS2) monolayer-plasmonic nanoantenna system. We show that electrical gating of monolayer WS2 allows tuning the oscillator strengths of neutral and charged excitons not only at cryogenic but also at room temperature, both at vacuum and atmospheric pressure. Such electrical control enables a full-range tunable switching from strong neutral exciton-plasmon coupling to strong charged exciton-plasmon coupling. Our experimental findings allow discussing beneficial and limiting factors of charged exciton-plasmon polaritons, as well as offer routes toward realization of charged polaritonic devices at ambient conditions.
Collapse
Affiliation(s)
- Battulga Munkhbat
- Department of Physics , Chalmers University of Technology , 412 96 , Göteborg , Sweden
| | - Denis G Baranov
- Department of Physics , Chalmers University of Technology , 412 96 , Göteborg , Sweden
| | - Ankit Bisht
- Department of Physics , Chalmers University of Technology , 412 96 , Göteborg , Sweden
| | - Md Anamul Hoque
- Department of Microtechnology and Nanoscience-MC2 , Chalmers University of Technology , 412 96 , Göteborg , Sweden
| | - Bogdan Karpiak
- Department of Microtechnology and Nanoscience-MC2 , Chalmers University of Technology , 412 96 , Göteborg , Sweden
| | - Saroj P Dash
- Department of Microtechnology and Nanoscience-MC2 , Chalmers University of Technology , 412 96 , Göteborg , Sweden
| | - Timur Shegai
- Department of Physics , Chalmers University of Technology , 412 96 , Göteborg , Sweden
| |
Collapse
|
5
|
Hu A, Zhang W, Liu S, Wen T, Zhao J, Gong Q, Ye Y, Lu G. In situ scattering of single gold nanorod coupling with monolayer transition metal dichalcogenides. NANOSCALE 2019; 11:20734-20740. [PMID: 31650146 DOI: 10.1039/c9nr06152e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We investigated in situ the interaction between a single gold nanorod and monolayer transition metal dichalcogenides (TMDCs) by atomic force microscopy nanomanipulation and single-particle spectroscopy. We observed that the resonant scattering peak of the hybrid redshifted, the full width at half maximum of the scattering resonance narrowed and the scattering intensity increased compared with those of the same nanorod before coupling with monolayer TMDCs. These results were understood with the aid of finite-difference time-domain simulations, the Fano model, and the classical oscillator model. Also, the spectral features varied with the distance between the nanorod and TMDCs, and the interaction was mainly attributed to the resonant energy transfer effect. Our findings clarify the influence of TMDCs on the plasmonic resonance and contribute to a deeper understanding of the plasmon exciton interaction. These results are beneficial for the optimization of plasmonic nanostructure-TMDC hybrids and their corresponding applications.
Collapse
Affiliation(s)
- Aiqin Hu
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China. and Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Weidong Zhang
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China. and Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Shuai Liu
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China.
| | - Te Wen
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China.
| | - Jingyi Zhao
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China.
| | - Qihuang Gong
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China. and Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Yu Ye
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China.
| | - Guowei Lu
- State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China. and Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
| |
Collapse
|
6
|
Wang M, Wu Z, Krasnok A, Zhang T, Liu M, Liu H, Scarabelli L, Fang J, Liz-Marzán LM, Terrones M, Alù A, Zheng Y. Dark-Exciton-Mediated Fano Resonance from a Single Gold Nanostructure on Monolayer WS 2 at Room Temperature. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1900982. [PMID: 31183956 DOI: 10.1002/smll.201900982] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 05/16/2019] [Indexed: 06/09/2023]
Abstract
Strong spatial confinement and highly reduced dielectric screening provide monolayer transition metal dichalcogenides with strong many-body effects, thereby possessing optically forbidden excitonic states (i.e., dark excitons) at room temperature. Herein, the interaction of surface plasmons with dark excitons in hybrid systems consisting of stacked gold nanotriangles and monolayer WS2 is explored. A narrow Fano resonance is observed when the hybrid system is surrounded by water, and the narrowing of the spectral Fano linewidth is attributed to the plasmon-enhanced decay of dark K-K excitons. These results reveal that dark excitons in monolayer WS2 can strongly modify Fano resonances in hybrid plasmon-exciton systems and can be harnessed for novel optical sensors and active nanophotonic devices.
Collapse
Affiliation(s)
- Mingsong Wang
- Department of Mechanical Engineering, Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Zilong Wu
- Department of Mechanical Engineering, Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Alex Krasnok
- Photonics Initiative, Advanced Science Research Center, Physics Program, Graduate Center, Department of Electrical Engineering, City College of the City University of New York, New York, NY, 10031, USA
| | - Tianyi Zhang
- Department of Materials Science and Engineering, Department of Physics, Department of Chemistry, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Mingzu Liu
- Department of Materials Science and Engineering, Department of Physics, Department of Chemistry, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA, 16802, USA
| | - He Liu
- Department of Materials Science and Engineering, Department of Physics, Department of Chemistry, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Leonardo Scarabelli
- Department of Chemistry and Biochemistry, California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Jie Fang
- Department of Mechanical Engineering, Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Luis M Liz-Marzán
- Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, 20014, Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, 48013, Bilbao, Spain
- Biomedical Research Networking Center in Bioengineering Biomaterials, and Nanomedicine, CIBER-BBN, 20014, Donostia-San Sebastián, Spain
| | - Mauricio Terrones
- Department of Materials Science and Engineering, Department of Physics, Department of Chemistry, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Andrea Alù
- Photonics Initiative, Advanced Science Research Center, Physics Program, Graduate Center, Department of Electrical Engineering, City College of the City University of New York, New York, NY, 10031, USA
| | - Yuebing Zheng
- Department of Mechanical Engineering, Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA
| |
Collapse
|
7
|
Szustakiewicz P, González‐Rubio G, Scarabelli L, Lewandowski W. Robust Synthesis of Gold Nanotriangles and their Self-Assembly into Vertical Arrays. ChemistryOpen 2019; 8:705-711. [PMID: 31205847 PMCID: PMC6559201 DOI: 10.1002/open.201900082] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/11/2019] [Indexed: 12/26/2022] Open
Abstract
We report an efficient, seed-mediated method for the synthesis of gold nanotriangles (NTs) which can be used for controlled self-assembly. The main advantage of the proposed synthetic protocol is that it relies on using stable (over the course of several days) intermediate seeds. This stability translates into increasing time efficiency of the synthesis and makes the protocol experimentally less demanding ('fast addition' not required, tap water can be used in the final steps) as compared to previously reported procedures, without compromising the size and shape monodispersity of the product. We demonstrate high reproducibility of the protocol in the hands of different researchers and in different laboratories. Additionally, this modified seed-mediated method can be used to produce NTs with edge lengths between ca. 45 and 150 nm. Finally, the high 'quality' of NTs allows the preparation of long-range ordered assemblies with vertically oriented building blocks, which makes them promising candidates for future optoelectronic technologies.
Collapse
Affiliation(s)
- Piotr Szustakiewicz
- Faculty of ChemistryUniversity of WarsawPasteura 1 st.Warsaw02-093Poland
- CICbiomaGUNEPaseo de Miramón 182Donostia-San Sebastián20014Spain
| | | | - Leonardo Scarabelli
- CICbiomaGUNEPaseo de Miramón 182Donostia-San Sebastián20014Spain
- California NanoSystems InstituteUniversity of California, Los AngelesLos Angeles90095 CaliforniaUSA
| | - Wiktor Lewandowski
- Faculty of ChemistryUniversity of WarsawPasteura 1 st.Warsaw02-093Poland
- CICbiomaGUNEPaseo de Miramón 182Donostia-San Sebastián20014Spain
| |
Collapse
|
8
|
Wang Y, Li X, Su Z, Wang H, Xia H, Chen H, Zhou J. Single Plasmonic Particle with Exposed Sensing Hot Spot for Exploring Gas Molecule Adsorption in Nanolocalized Space. Anal Chem 2019; 91:4063-4069. [DOI: 10.1021/acs.analchem.8b05653] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yangyang Wang
- Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Xuemeng Li
- Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Zhenning Su
- Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Hao Wang
- State Key Lab of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Hongqi Xia
- Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Huanjun Chen
- State Key Lab of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Jianhua Zhou
- Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou 510275, China
| |
Collapse
|
9
|
Catalán-Gómez S, Garg S, Redondo-Cubero A, Gordillo N, de Andrés A, Nucciarelli F, Kim S, Kung P, Pau JL. Photoluminescence enhancement of monolayer MoS 2 using plasmonic gallium nanoparticles. NANOSCALE ADVANCES 2019; 1:884-893. [PMID: 36132234 PMCID: PMC9473177 DOI: 10.1039/c8na00094h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 11/18/2018] [Indexed: 05/21/2023]
Abstract
2D monolayer molybdenum disulphide (MoS2) has been the focus of intense research due to its direct bandgap compared with the indirect bandgap of its bulk counterpart; however its photoluminescence (PL) intensity is limited due to its low absorption efficiency. Herein, we use gallium hemispherical nanoparticles (Ga NPs) deposited by thermal evaporation on top of chemical vapour deposited MoS2 monolayers in order to enhance its luminescence. The influence of the NP radius and the laser wavelength is reported in PL and Raman experiments. In addition, the physics behind the PL enhancement factor is investigated. The results indicate that the prominent enhancement is caused by the localized surface plasmon resonance of the Ga NPs induced by a charge transfer phenomenon. This work sheds light on the use of alternative metals, besides silver and gold, for the improvement of MoS2 luminescence.
Collapse
Affiliation(s)
- Sergio Catalán-Gómez
- Grupo de Electrónica y Semiconductores, Departamento de Física Aplicada, Universidad Autónoma de Madrid Cantoblanco E-28049 Madrid Spain
| | - Sourav Garg
- Electrical and Computer Engineering Department, University of Alabama Tuscaloosa Alabama USA
| | - Andrés Redondo-Cubero
- Grupo de Electrónica y Semiconductores, Departamento de Física Aplicada, Universidad Autónoma de Madrid Cantoblanco E-28049 Madrid Spain
| | - Nuria Gordillo
- Grupo de Electrónica y Semiconductores, Departamento de Física Aplicada, Universidad Autónoma de Madrid Cantoblanco E-28049 Madrid Spain
| | - Alicia de Andrés
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas (ICMM-CSIC) C/Sor Juana Inés de la Cruz, 4 E-28049 Madrid Spain
| | - Flavio Nucciarelli
- Grupo de Electrónica y Semiconductores, Departamento de Física Aplicada, Universidad Autónoma de Madrid Cantoblanco E-28049 Madrid Spain
- Physics Department, Lancaster University Lancaster LA1 4YB UK
| | - Seonsing Kim
- Electrical and Computer Engineering Department, University of Alabama Tuscaloosa Alabama USA
| | - Patrick Kung
- Electrical and Computer Engineering Department, University of Alabama Tuscaloosa Alabama USA
| | - Jose Luis Pau
- Grupo de Electrónica y Semiconductores, Departamento de Física Aplicada, Universidad Autónoma de Madrid Cantoblanco E-28049 Madrid Spain
| |
Collapse
|
10
|
Valley-Selective Response of Nanostructures Coupled to 2D Transition-Metal Dichalcogenides. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8071157] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Monolayer (1L) transition-metal dichalcogenides (TMDCs) are attractive materials for several optoelectronic applications because of their strong excitonic resonances and valley-selective response. Valley excitons in 1L-TMDCs are formed at opposite points of the Brillouin zone boundary, giving rise to a valley degree of freedom that can be treated as a pseudospin, and may be used as a platform for information transport and processing. However, short valley depolarization times and relatively short exciton lifetimes at room temperature prevent using valley pseudospins in on-chip integrated valley devices. Recently, it was demonstrated how coupling these materials to optical nanoantennas and metasurfaces can overcome this obstacle. Here, we review the state-of-the-art advances in valley-selective directional emission and exciton sorting in 1L-TMDC mediated by nanostructures and nanoantennas. We briefly discuss the optical properties of 1L-TMDCs paying special attention to their photoluminescence/absorption spectra, dynamics of valley depolarization, and the valley Hall effect. Then, we review recent works on nanostructures for valley-selective directional emission from 1L-TMDCs.
Collapse
|
11
|
Krasnok A, Lepeshov S, Alú A. Nanophotonics with 2D transition metal dichalcogenides [Invited]. OPTICS EXPRESS 2018; 26:15972-15994. [PMID: 30114850 DOI: 10.1364/oe.26.015972] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 04/17/2018] [Indexed: 06/08/2023]
Abstract
Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) have recently become attractive materials for several optoelectronic applications, such as photodetection, light harvesting, phototransistors, light-emitting diodes, and lasers. Their bandgap lies in the visible and near-IR range, and they possess strong excitonic resonances, high oscillator strengths, and valley-selective response. Coupling these materials to optical nanocavities enhances the quantum yield of exciton emission, enabling advanced quantum optics and nanophotonics devices. Here, we review the state-of-the-art advances of hybrid exciton-polariton structures based on monolayer TMDCs coupled to plasmonic and dielectric nanocavities. We discuss the optical properties of 2D WS2, WSe2, MoS2 and MoSe2 materials, paying special attention to their energy bands, photoluminescence/absorption spectra, excitonic fine structure, and to the dynamics of exciton formation and valley depolarization. We also discuss light-matter interactions in such hybrid exciton-polariton structures. Finally, we focus on weak and strong coupling regimes in monolayer TMDCs-based exciton-polariton systems, envisioning research directions and future opportunities for this material platform.
Collapse
|
12
|
Lepeshov S, Wang M, Krasnok A, Kotov O, Zhang T, Liu H, Jiang T, Korgel B, Terrones M, Zheng Y, Alú A. Tunable Resonance Coupling in Single Si Nanoparticle-Monolayer WS 2 Structures. ACS APPLIED MATERIALS & INTERFACES 2018; 10:16690-16697. [PMID: 29651843 DOI: 10.1021/acsami.7b17112] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) are extremely attractive materials for optoelectronic applications in the visible and near-infrared range. Coupling these materials to optical nanocavities enables advanced quantum optics and nanophotonic devices. Here, we address the issue of resonance coupling in hybrid exciton-polariton structures based on single Si nanoparticles (NPs) coupled to monolayer (1L)-WS2. We predict a strong coupling regime with a Rabi splitting energy exceeding 110 meV for a Si NP covered by 1L-WS2 at the magnetic optical Mie resonance because of the symmetry of the mode. Further, we achieve a large enhancement in the Rabi splitting energy up to 208 meV by changing the surrounding dielectric material from air to water. The prediction is based on the experimental estimation of TMDC dipole moment variation obtained from the measured photoluminescence spectra of 1L-WS2 in different solvents. An ability of such a system to tune the resonance coupling is realized experimentally for optically resonant spherical Si NPs placed on 1L-WS2. The Rabi splitting energy obtained for this scenario increases from 49.6 to 86.6 meV after replacing air by water. Our findings pave the way to develop high-efficiency optoelectronic, nanophotonic, and quantum optical devices.
Collapse
Affiliation(s)
| | | | | | - Oleg Kotov
- Institute of MicroelectronicsTechnology and High Purity Materials , Russian Academy of Sciences , 142432 Chernogolovka , Russia
| | | | | | | | | | - Mauricio Terrones
- Department of Materials Science and Engineering & Chemical Engineering , Carlos III University of Madrid , Avenida Universidad 30 , Leganés, Madrid 28911 , Spain
- IMDEA Materials Institute , Eric Kandel 2 , Getafe, Madrid 28005 , Spain
| | | | - Andrea Alú
- Photonics Initiative, Advanced Science Research Center , City University of New York , New York , New York 10031 , United States
- Physics Program, Graduate Center , City University of New York , New York 10016 , United States
- Department of Electrical Engineering , City College of The City University of New York , New York 10031 , United States
| |
Collapse
|
13
|
Tao Y, Yu X, Li J, Liang H, Zhang Y, Huang W, Wang QJ. Bright monolayer tungsten disulfide via exciton and trion chemical modulations. NANOSCALE 2018; 10:6294-6299. [PMID: 29577131 DOI: 10.1039/c7nr09442f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Atomically thin transition metal dichalcogenides (TMDCs) with exceptional electrical and optical properties have drawn tremendous attention for use in novel optoelectronic applications as photodetectors, transistors, light emitters, etc. However, electron bound trions formed through the combination of neutral excitons and electrons significantly decrease the photoluminescence (PL) efficiency of TMDCs. In this study, we report a simple yet efficient chemical doping strategy to modulate the optical properties of monolayer tungsten disulfide (WS2). As a demonstrative example, a chemically doped monolayer of WS2 exhibits remarkable PL enhancement of about one order of magnitude higher than that of pristine WS2. This outstanding PL enhancement is attributed to the fact that excess electrons, which promote the formation of electron-bound trions, are reduced in number through charge transfer from WS2 to the chemical dopant. Furthermore, an improved degree of circular polarization from ∼9.0% to ∼41.5% was also observed in the chemically doped WS2 monolayer. This work describes a feasible strategy to manipulate the optical properties of TMDCs via exciton modulation, making TMDCs promising candidates for versatile semiconductor-based photonic devices.
Collapse
Affiliation(s)
- Ye Tao
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
| | | | | | | | | | | | | |
Collapse
|
14
|
Liu JT, Tong H, Wu ZH, Huang JB, Zhou YS. Greatly enhanced light emission of MoS 2 using photonic crystal heterojunction. Sci Rep 2017; 7:16391. [PMID: 29180676 PMCID: PMC5703902 DOI: 10.1038/s41598-017-16502-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 11/14/2017] [Indexed: 11/20/2022] Open
Abstract
We present theoretical study on developing a one-dimensional (1D) photonic crystal heterojunction (h-PhC) that consists of a monolayer molybdenum disulfide (MoS2) structure. By employing the transfer matrix method, we obtained the analytical solution of the light absorption and emission of two-dimensional materials in 1D h-PhC. Simultaneously enhancing the light absorption and emission of the medium in multiple frequency ranges is easy as h-PhC has more modes of photon localization than the common photonic crystal. Our numerical results demonstrate that the proposed 1D h-PhC can simultaneously enhance the light absorption and emission of MoS2 and enhance the photoluminescence spectrum of MoS2 by 2-3 orders of magnitude.
Collapse
Affiliation(s)
- Jiang-Tao Liu
- College of Mechanical and electrical engineering, Guizhou Minzu University, Guiyang, 550025, China.
- Department of Physics, Nanchang University, Nanchang, 330031, China.
- Institute for Advancfed Study, Nanchang University, Nanchang, 330031, China.
| | - Hong Tong
- College of Mechanical and electrical engineering, Guizhou Minzu University, Guiyang, 550025, China
| | - Zhen-Hua Wu
- Key Laboratory of Microelectronic Devices and Integrated Technology, Institute of Microelec-tronics, Chinese Academy of Sciences, Beijing, 100029, China
| | - Jin-Bao Huang
- College of Mechanical and electrical engineering, Guizhou Minzu University, Guiyang, 550025, China
| | - Yun-Song Zhou
- Department of Physics, Capital Normal University, Beijing, 100037, China.
| |
Collapse
|