Plasmon-Assisted Selective Enhancement of Direct-Band Transitions in Multi-Layer MoS<sub>2</sub>
Multi-layer MoS<sub>2</sub> offers numerous advantages over mono-layer MoS<sub>2</sub> in terms of improved absorption, enhanced emission and high optical density of states, which make it a better candidate for devices. However, the selective tuning of the direct-band emissio...
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IEEE
2019-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/8795554/ |
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| author | Tejendra Dixit Ankit Arora Miryala Muralidhar Masato Murakami Pramoda K. Nayak Kolla Lakshmi Ganapathi M. S. Ramachandra Rao |
| author_facet | Tejendra Dixit Ankit Arora Miryala Muralidhar Masato Murakami Pramoda K. Nayak Kolla Lakshmi Ganapathi M. S. Ramachandra Rao |
| author_sort | Tejendra Dixit |
| collection | DOAJ |
| description | Multi-layer MoS<sub>2</sub> offers numerous advantages over mono-layer MoS<sub>2</sub> in terms of improved absorption, enhanced emission and high optical density of states, which make it a better candidate for devices. However, the selective tuning of the direct-band emissions in multi-layer MoS<sub>2</sub> is essential for various optoelectronic applications. In this work, we have demonstrated a systematic tuning of direct-band transitions in multi-layer MoS<sub>2</sub> using Au coating prepared by sputtering and e-beam evaporation. We observed nearly 80-fold enhancement in the ratio of direct-to indirect-peak intensity with Au coating (e-beam) to that of the direct-to indirect-peak intensity of pristine samples. Along with that, complete quenching in the emissions corresponding to I-valley has been observed with Au coating. This work provides new dimensions towards the realization of plasmonic/optoelectronic devices based on multi-layer MoS<sub>2</sub>. |
| format | Article |
| id | doaj-art-6899b4e9cca0458bb5a861a307fadd1d |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-6899b4e9cca0458bb5a861a307fadd1d2025-08-20T03:30:57ZengIEEEIEEE Photonics Journal1943-06552019-01-011151610.1109/JPHOT.2019.29350008795554Plasmon-Assisted Selective Enhancement of Direct-Band Transitions in Multi-Layer MoS<sub>2</sub>Tejendra Dixit0https://orcid.org/0000-0002-7182-3907Ankit Arora1https://orcid.org/0000-0003-4899-1336Miryala Muralidhar2https://orcid.org/0000-0003-2205-0378Masato Murakami3Pramoda K. Nayak4Kolla Lakshmi Ganapathi5https://orcid.org/0000-0002-8693-5733M. S. Ramachandra Rao6https://orcid.org/0000-0002-7806-2151Materials Science Research Centre and Department of Physics, Indian Institute of Technology Madras, Chennai, IndiaMaterials Science Research Centre and Department of Physics, Indian Institute of Technology Madras, Chennai, IndiaSuperconducting Material Laboratory, Graduate School of Science and Engineering, Shibaura Institute of Technology, Tokyo, JapanSuperconducting Material Laboratory, Graduate School of Science and Engineering, Shibaura Institute of Technology, Tokyo, JapanMaterials Science Research Centre and Department of Physics, Indian Institute of Technology Madras, Chennai, IndiaMaterials Science Research Centre and Department of Physics, Indian Institute of Technology Madras, Chennai, IndiaMaterials Science Research Centre and Department of Physics, Indian Institute of Technology Madras, Chennai, IndiaMulti-layer MoS<sub>2</sub> offers numerous advantages over mono-layer MoS<sub>2</sub> in terms of improved absorption, enhanced emission and high optical density of states, which make it a better candidate for devices. However, the selective tuning of the direct-band emissions in multi-layer MoS<sub>2</sub> is essential for various optoelectronic applications. In this work, we have demonstrated a systematic tuning of direct-band transitions in multi-layer MoS<sub>2</sub> using Au coating prepared by sputtering and e-beam evaporation. We observed nearly 80-fold enhancement in the ratio of direct-to indirect-peak intensity with Au coating (e-beam) to that of the direct-to indirect-peak intensity of pristine samples. Along with that, complete quenching in the emissions corresponding to I-valley has been observed with Au coating. This work provides new dimensions towards the realization of plasmonic/optoelectronic devices based on multi-layer MoS<sub>2</sub>.https://ieeexplore.ieee.org/document/8795554/Photoluminescence spectroscopyexciton-plasmon couplingdirect band transitionmulti-layer MoS<inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$_{2}$</tex-math> </inline-formula>. |
| spellingShingle | Tejendra Dixit Ankit Arora Miryala Muralidhar Masato Murakami Pramoda K. Nayak Kolla Lakshmi Ganapathi M. S. Ramachandra Rao Plasmon-Assisted Selective Enhancement of Direct-Band Transitions in Multi-Layer MoS<sub>2</sub> IEEE Photonics Journal Photoluminescence spectroscopy exciton-plasmon coupling direct band transition multi-layer MoS<inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$_{2}$</tex-math> </inline-formula>. |
| title | Plasmon-Assisted Selective Enhancement of Direct-Band Transitions in Multi-Layer MoS<sub>2</sub> |
| title_full | Plasmon-Assisted Selective Enhancement of Direct-Band Transitions in Multi-Layer MoS<sub>2</sub> |
| title_fullStr | Plasmon-Assisted Selective Enhancement of Direct-Band Transitions in Multi-Layer MoS<sub>2</sub> |
| title_full_unstemmed | Plasmon-Assisted Selective Enhancement of Direct-Band Transitions in Multi-Layer MoS<sub>2</sub> |
| title_short | Plasmon-Assisted Selective Enhancement of Direct-Band Transitions in Multi-Layer MoS<sub>2</sub> |
| title_sort | plasmon assisted selective enhancement of direct band transitions in multi layer mos sub 2 sub |
| topic | Photoluminescence spectroscopy exciton-plasmon coupling direct band transition multi-layer MoS<inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$_{2}$</tex-math> </inline-formula>. |
| url | https://ieeexplore.ieee.org/document/8795554/ |
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