Stokes and anti‐Stokes Raman spectra of the high‐energy C–C stretching modes in graphene and diamond. Issue 11 (2nd September 2015)

• Record Type: Journal Article
• Authors: Jorio, Ado; Kasperczyk, Mark; Clark, Nick; Neu, Elke; Maletinsky, Patrick; Vijayaraghavan, Aravind; Novotny, Lukas
• Is Part Of: Physica status solidi. Volume 252:Issue 11(2015:Nov.)
• Page Start: 2380
• Page End: 2384
• Publication Date: 2015-09-02
• Subjects: anti‐Stokes scattering -- diamond -- graphene -- Raman spectroscopy; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201552224
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : The Stokes and the anti‐Stokes Raman spectra from the high energy carbon–carbon stretching modes in graphene and diamond are studied, with a focus on their intensity dependence on the excitation laser power. For diamond, the experiment was performed on a 50 μm slice of chemical vapour deposition grown single crystal using a 785 nm laser, in both the continuous wave (CW) and pulsed mode‐locked (ML—130 fs pulses) excitation regimes. For graphene, the experiments were performed on suspended samples, including single layer, bilayer with AB‐staking, twisted bi‐layer and a sample with 4–6 layers, using λ = 532 and 633 nm CW lasers. The Stokes and anti‐Stokes intensities vary largely from sample to sample, and the anti‐Stokes/Stokes intensity ratio shows different excitation laser power behaviours. These differences can be explained on the basis of laser heating or correlated Stokes–anti‐Stokes scattering phenomena. Abstract : This article presents experimental data on the inelastic light scattering in diamond and graphene. While the procedure reported here has been broadly used to measure the local temperature in materials science, the authors show that the theoretical background for such has to be generalized to account for an effect named here "Stokes‐anti‐Stokes correlation". Although this is a rare event, the present work shows evidences that it might be important in nanomaterials.