Scholarship 24/09159-7 - - BV FAPESP
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Enabling THz nanoscopy of 2D materials driven by THz gas lasers pumped by a quantum cascade IR source

Grant number: 24/09159-7
Support Opportunities:Scholarships abroad - Research
Start date until: January 06, 2025
End date until: April 05, 2025
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Raul de Oliveira Freitas
Grantee:Raul de Oliveira Freitas
Host Investigator: Jean-Francois Lampin
Host Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia e Inovação (Brasil). Campinas , SP, Brazil
Institution abroad: Institut D'Electronique, De Microélectronique Et De Nanotechnologies, France  
Associated research grant:19/14017-9 - From excitons waves to THz-phonons: 2Ds materials nano-optics via synchrotron infrared nanospectroscopy, AP.JP

Abstract

In the rapidly growing field of nanophotonics, the exploration of two-dimensional (2D) materials in the far-infrared (far-IR) and terahertz (THz) spectral ranges has become increasingly important. These materials display unique optical properties such as high electromagnetic wave confinement and enhanced light-matter interactions, not seen in their bulk forms. However, practical application is hindered by challenges like low absorption coefficients and limited tunability in these spectral ranges, which obstruct the development of efficient photonic devices. In the practical side, generating terahertz radiation (0.3 to 3.0 THz) presents challenges due to its position between microwave and infrared spectral ranges, crucial for applications like wireless communications, radar, spectroscopy, and astronomy. Various techniques are used to produce THz radiation, including harmonic multipliers, vacuum electronics, and ultrafast lasers. However, these methods face limitations such as high costs, low power around 1 THz, and complex operational requirements. Terahertz quantum cascade lasers offer compact solutions but with limited tunability and cryogenic operation needs. Optically pumped far-infrared (OPFIR) lasers, using CO2 lasers for specific molecular transitions, can generate substantial power with narrow linewidths but are bulky and inefficient with poor tunability, reducing their use. This research proposal focuses on implementing scattering Scanning Near-field Microscopy (s-SNOM), a spectral-nanoimaging modality, in the far-IR and THz range, integrated with a custom-designed Quantum cascade Pumped Molecular Laser (QPML) to study various 2D materials at the Institute of Electronics Microelectronics and Nanotechnology (IEMN). This initiative is innovative as it marks the first integration of s-SNOM with a QPML. The project aims to examine Transition Metal Dichalcogenides (TMDs) like MoS2 and WSe2 and the topological insulator Bi2Se3, exploring their phonon activity and potential phonon-polaritonic behaviors as ultra-confined waves. Successful outcomes could significantly enhance nanoscale analyses capabilities, aligning strategically with Brazil's efforts in developing new synchrotron radiation beamlines at LNLS for the far-IR and THz ranges.

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