UGC-DAE Consortium for Scientific Research
( An Autonomous Institution of University Grants Commission, New Delhi )
Micro Raman spectrometer
Dr. Vasant Sathe
Raman spectroscopy is widely used to study the phonons in solids, liquids and gases. Our micro-Raman spectrometer has been extensively used by many researchers across the country for characterization of nano particles, films, solids, liquids and identifying different phases and to elucidate physical phenomena like, spin-phonon, electron-phonon, orbital-lattice interactions and phase transitions. The results from this system contributed in nearly 100 publications in international journals.
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  • Micro Raman system from Jobin Yvon Horibra LABRAM-HR visible (400 - 1100 nm)
  • Raman spectra can be recorded from 50 cm-1 to 4000 cm-1 of Raman shift.
  • Excitation Laser Sources - He-Ne 632.8 nm and Argon 488 nm
  • Optics: high stability confocal Microscope for Micro Raman 10x, 50x, 100x objective lens. The laser can be focused on to a spot from ~1micron to 5 micron by choosing suitable objective lens.
  • Polarization analysis of samples can be carried out.
  • Automated XY sample stage for Raman mapping. Sample can be scanned with an accuracy of 1 micron in lateral direction i.e. Raman imaging of smooth surfaces is possible.
  • A lateral resolution of 1 micron and an axial resolution of 2 micron can be achieved with confocal optics
  • A white light with a video camera for viewing sample. Sample can be viewed optically using microscope and Raman spectra can be recorded on any desired portion of sample.
  • Dispersive geometry
  • 600 and 1800 lines/mm gratings - Detector : CCD detector
  • Spectral Resolution of the order of 1 cm-1
  • Low temperature measurements upto 10 K

Sample Requirement:

  • No special requirement. Pellets of size ~ 5 mm dia are preferred. Powder and liquid samples can also be used. - Signal is better for optically flat surfaces

Research Students:
  • Ms. Aditi Dubey
  • Ms. Anju Ahlawat
  • Shri Dileep Mishra
  • Shri Satish Kumar

Selected Publications:

1.     Evidence of Fano resonance in temperature dependent Raman study of CaCu3Ti4O12 and SrCu3Ti4O12
Dileep K Mishra and V G Sathe
J. Phys.: Condens. Matter FTC 24 (2012) 252202 (IOP SELECT).

2.     Synthesis and signature of M-E coupling in novel self-assembled CaCu3Ti4O12-NiFe2O4 nanocomposite structure
Anju Ahlawat, V. G. Sathe, V. Ganesan, D. M. Phase, and S. Satapathy
J. Appl. Phys. 111, 074302 (2012)

3.     Raman study of NiFe2O4 nanoparticles, bulk and films: effect of laser power
Anju Ahlawat and V. G. Sathe,
Journal of Raman Spectrosc. 42, (2011) 1087-1094

4.     Evidence of orbital excitations in CaCu3Ti4O12 probed by Raman spectroscopy
Dileep K Mishra and V G Sathe
J. Phys.: Condens. Matter FTC 23 (2011) 072203 (IOP SELECT)

5.     Photo-induced insulator-metal transition probed by Raman spectroscopy
VG Sathe, R Rawat, Aditi Dubey, A V Narlikar and D Prabhakaran
J. Phys.: Condens. Matter 21 (2009) 075603

6.      Signature of Jahn-Teller distortion and oxygen stoichiometry in Raman spectra of epitaxial LaMnO3+  thin films
Aditi Dubey, V. G. Sathe and R. Rawat
J. Appl. Phys. 104 (2008) 113530

7.     Broken symmetry in LaAlO3 single crystal probed by resonant Raman spectroscopy
V G Sathe and A Dubey
J. Phys.: Condens. Matter FTC 19 (2007) 382201

8.     The effect of magnetic order and thickness in the Raman spectra of oriented thin films of LaMnO3
Aditi Dubey and V G Sathe
J. Phys.: Condens. Matter 19 (2007) 346232

9.     Raman spectroscopy of RuSr2(Eu1.5Ce0.5)Cu2O10 magneto-superconductor
V.G. Sathe, V.P.S. Awana, Akshay Deshpande, H. Kishan, A.V. Narlikar
Solid State Communication 141 658 (2007)

10.    Phase coexistence and separation of bulk and surface behaviour  in martensitic phase transition in GdCu
V.G. Sathe, R. Rawat and A. Dubey, Phys. Rev. B 74 (2006) 52101.

How to use this facility (click here)