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Welcome to the Device Spectroscopy Lab

The Device Spectroscopy Laboratory, DSL, here at Bar-Ilan University is focused on spectroscopy of nanoscale materials and devices composed of such materials.  Our efforts are concentrated on understanding and tailoring light-matter interactions at the most fundamental level, and then on parlaying these insights into useful devices.

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Dr. Bharathi Rajeswaran Presented at 2022 MRS Spring Meeting (virtual) on
"Tip Enhanced Rayleigh Scattering via a Gap Mode in Transmission Geometry"

May 24, 2022

Research Interests and Scientific Activities

Major research interest at Device Spectroscopy Laboratory is studying and tailoring light-matter interactions inside of nanoscale devices.  The devices are not restricted to lasers and LEDs, but can even be microcavities, semiconductor nanostructures or biological materials such as proteins and bacteria.

Coherent Light-Matter Interactions

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At our group, we intensively study CLM Interactions. We are interested in using microcavity devices to enhance light-matter interactions, such as for strong light-matter coupling in the mid-infrared, and for monolayer lasers.

Near-Field Spectroscopy


In an effort to gain a better understanding of materials at nano-scale spatial resolution, we employ techniques such as NSOM, dual SPM probe AFM:NSOM, and TERS (Tip-Enhanced Raman Scattering).

Applied Spectroscopy

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We develop the methodologies of Low-Frequency Raman  Spectroscopy for characterizing nanostructured materials, such as organic, semiconducting, perovskite, biological and organic/inorganic hybrids. We also investigate methods of enhancing Raman scattering.

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Ongoing Research Projects

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Coherent Infrared Emission from Organic Materials


We are a team of researchers, including students, post-docs, and staff scientists, that are passionate about multiple domains of science, ranging from chemistry and materials to physics and optics.  Most of all, we enjoy working together and striving to have a positive and meaningful impact on society.

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Prof. Yaakov R. Tischler

Principal Investigator


Dr. Hagit Aviv

Lab. Manager


Rena Itzhari

Doctoral Researcher

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Shalom Avadyayev

Doctoral Researcher

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Dr. Bharathi Rajeswaran
Post Doctoral Researcher


Shira Rachel Zafran
Graduate Researcher

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The magic of DSL is the students and staff.  Thankfully, I have students and staff who come with a high aptitude for scientific work and who possess tremendous desire to succeed.  I have also learned not only to manage students, but to nurture them, motivate them, and lead them, and ultimately empower them to be independent scientific thinkers, doers, and leaders.  I have found that success is a natural by-produce of character, and so I promote building the character of the people in my lab, to help them expand their comfort zones, to work together as a team, and to develop the desire to attain personal and collective goals.  In my opinion, the lab is a powerhouse in the subject areas of device spectroscopy. To the greatest extent possible, we also share our expertise in spectroscopy, joining forces with other labs in collaborations and in providing assistance to meet their characterization needs.

Yaakov R. Tischler

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Robotic Lab Assistant
Robotic Lab Assistant


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Issued Patents

  1. “Device and Method for Luminescence Enhancement by Resonant Energy Transfer from an Absorptive Thin Film,” G.M. Akselrod, M.G. Bawendi, V. Bulović, J.R. Tischler, W.A. Tisdale, B.J. Walker, US 8,908,261, December 9, 2014.

  2. “Absorbing Film,” M.S. Bradley, J.R. Tischler, V. Bulović, US 8,809,876, August 19, 2014.

  3. “Method and Apparatus for Super Radiant Laser Action in Half Wavelength Thick Organic Semiconductor Microcavities,” J.R. Tischler, E.R. Young, D.G. Nocera, V.Bulović, US 8,748,219, June 10, 2014.

  4. “High Resolution Near Field Scanning Optical Microscopy,” J.R. Tischler, M.S. Bradley, V. Bulović, US 8,693,837, April 8, 2014.

  5. “LED Array with Photodetector,” V. Bulović, J.R. Tischler, J. Galela, US 8,692,747, April 8, 2014.

  6. “Light emitting material," J.E. Halpert, J.R. Tischler, M.G. Bawendi, V. Bulović, US 8,480,927, July 9, 2013.

  7. “Optical structures including nanocrystals," V. Bulović, I. Kymissis, M.G. Bawendi, J.R. Tischler, M.S. Bradley, D. Oertel, J. Yu, US 8,472,758, June 25, 2013.

  8. “Light-absorbing structure and methods of making,” J.R. Tischler, M.S. Bradley, V. Bulović, US 8,449,125, May 28, 2013.

  9. “LED Array with Photodetector,” V. Bulović, J.R. Tischler, J. Yu,US 8,390,544, March 5, 2013.

  10. “LED Array with Photodetector,” V. Bulović, J.R. Tischler, J. Yu, US 8,264,431, September 11, 2012.

  11. “Absorbing Film,” J. Tischler, M.S. Bradley, V. Bulović, US 7,799,422, September 21, 2010.

  12. “Light Emitting Device,” J. Tischler, M.S. Bradley, V. Bulović, US 7,649,196, January 19, 2010.

Provisional Patents

  1. “Multi-Layer Devices based on Hybrid Perovskites and Film Transfer Technology,” Y.R. Tischler, et al., US Provisional Patent Application, Serial No. US 62/743,564, October 10, 2018.

  2. “Device and Method to Spectrally Resolve Optical Radiation,” Y. R. Tischler, et al., US Provisional Patent Application, Serial No. 62/717,850, September 17, 2018.

  3. “Chiral Purity of Crystals Using Low-Frequency Raman Spectroscopy,” Y. Tischler, at al., US Provisional Patent Application, Serial No. 62/675,789, May 24, 2018.

Piles of Paper
Piles of Paper


Home: Publications
  1. "Structural Characterization and Room Temperature Low-Frequency Raman Scattering from MAPbI3 Halide Perovskite Films Rigidized by Cesium Incorporation "Vinayaka H. Damle, Laxman Gouda, Shay Tirosh, and Yaakov R. Tischler, ACS ApplEnrgMat. (Dec. 2018)

  2. "Chiral Purity of Crystals Using Low‐Frequency Raman Spectroscopy", I. Nemstov, Y. Mastai, Y. R. Tischer, H. Aviv, ChemPhysChem, 19, p. 1-7, (Sept. 2018)

  3. "Characterization of peptides self-assembly by low frequency Raman spectroscopy", M. Ronen, B. S. Kalanoor, Z. Oren, I. Ron, Y. R. Tischler, D. Gerber, RSC Advances, 8(29), p. 16161-16170 (April 2018).

  4. "Characterization of Crystal Chirality in Amino Acids Using Low-Frequency Raman Spectroscopy", H. Aviv, I. Nemtsov, Y. Mastai, Y. R. Tischler, J. Phys. Chem A, 121(41), p. 7882-7888 (October 2017)

  5. "Vibrational Strong Light–Matter Coupling Using a Wavelength-Tunable Mid-infrared Open Microcavity", O. Kapon, R. Yitzhari, A. Palatnik, Y. R. Tischler, J. Phys. Chem. C, 121(34), p. 18845-18853 (July 2017).

  6. "Replacing a Century Old Technique–Modern Spectroscopy Can Supplant Gram Staining", S. Berezin, Y. Aviv, H. Aviv, E. Goldberg, Y. R. Tischler, Scientific Reports, 7(1), p. 3810 (June 2017).

  7. "Microcavity Laser Based on a Single Molecule Thick High Gain Layer", A. Palatnik, H. Aviv, Y. R. Tischler, ACS Nano, 11(5), p. 4514-4520 (April 2017).

  8. "New Method to Study the Vibrational Modes of Biomolecules in the Terahertz Range Based on a Single-Stage Raman Spectrometer", B. S. Kalanoor, M. Ronen, Z. Oren, D. Gerber, Y. R. Tischler, ACS Omega, 2(3), p. 1232-1240 (March 2017).

  9. “The effect of excitation wavelength and metallic nanostructure on SERS spectra of C60”, M. Sinwani, M. Muallem, Y. R. Tischler, Journal of Raman Spectroscopy, (March 2017).

  10. “Deposition and Characterization of Roughened Surfaces”, H. Aviv, S. Berezin, O. Agai, M. Sinwani, Y. R. Tischler, Langmuir, (Feb. 2017).

  11. “Low Cost Method for Generating Periodic Nanostructures by Interference Lithography Without the Use of an Anti-Reflection Coating”, O. Kapon, M. Muallem, A. Palatnik, H. Aviv, Y. R. Tischler, MRS Advances, pp. 1-6, (Jan. 2017).

  12. “Influence of gain material concentration on an organic DFB laser”, A. Palatnik, O. Bitton, H. Aviv, Y. R. Tischler, Optical Materials Express, 6 (9), 2715-2724 (Sept. 2016).

  13. “Solid State Rhodamine 6G Microcavity Laser”, A. Palatnik, Y. R. Tischler, IEEE Photonics Technology Letters, (May 2016).

  14. “Strong Light-matter Coupling and Hybridization of Molecular Vibrations in a Low-Loss Infrared Microcavity”, M. Muallem, A. Palatnik, G. Nessim, Y. R. Tischler, J. Phys. Chem. Lett., 7 (11), pp 2002-2008, (May 2016).

  15. “Strong Light-matter Coupling Between a Molecular Vibrational Mode in a PMMA Film and a Low-loss Mid-IR Microcavity”, M. Muallem, A. Palatnik, G. Nessim, Y. R. Tischler, Annalen der Physik, 528, pp 313-320, (Apr. 2016).

  16. “Third order optical nonlinearities in organometallic methylammonium lead iodide perovskite thin films”, B.S. Kalanoor, A. Zaban, Y.R. Tischler, ACS Photonics, 3, pp 361-370 (Feb. 2016).

  17. “Spectroscopic method for fast and accurate Group A Streptococcus bacteria detection”, D. Schiff, H. Aviv, E. Rosenbaum, Y.R. Tischler, Analytical Chemistry, 88, pp 2164-2169 (Jan. 2016).

  18. “A simplified method for generating periodic nanostructures by interference lithography without the use of an anti-reflection coating”, O. Kapon, M. Muallem, A. Palatnik, H. Aviv, Y. Tischler, Applied Physics Letters, 107, 201105, (Nov. 2015).

  19. “Photoinduced Reversible Structural Transformation in Free Standing CH3NH3PbI3 Perovskite Films”, R. Gottesman, L. Gouda, B. S. Kalanoor, E. Haltzi, S. Tirosh, E. Rosh Hodesh, Y. R. Tischler, A. Zaban, J. Phys. Chem. Lett., 6, pp 2332–2338, (June 2015).

  20. “Utilizing pulsed laser deposition lateral inhomogeneity as a tool in combinatorial material science”, D. A. Keller, A. Ginsburg, H. Barad, K. Shimanovich, Y. Bouhadana, E. Rosh-Hodesh, I. Takeuchi, H. Aviv, Y. R. Tischler, A. Anderson, A. Zaban, ACS Combinatorial Science, 17, p. 209-216, (Apr. 2015).

  21. “Synthesis and characterization of a J-aggregating TDBC derivative in solution and in Langmuir-Blodgett films”, H. Aviv and Y. R. Tischler, Journal of Luminescence, 158, p. 376-383, (Feb. 2015).

  22. “Room temperature fabrication of dielectric Bragg reflectors composed of a CaF2/ZnS multilayered coating”, M. Muallem, A. Palatnik, G. Nessim, Y. Tischler, ACS Applied Materials & Interfaces, 7, 1, p. 474-481, (Jan. 2015).

  23. “Super-resolved Raman Spectra of Toluene and Toluene-Chlorobenzene Mixture, D. Malka, G. Berkovic, Y. Tischler, Z. Zalevsky, Spectroscopy Letters, 48, 6, p. 431-435, (Jan. 2015).

  24. “Synthesis of an amphiphilic rhodamine derivative and characterization of its solution and thin film properties”, H. Aviv, S. Harazi, D. Schiff, Y. Ramon, Y. R. Tischler, Thin Solid Films, 564, p. 86-91, (Aug. 2014).

  25. “Millimeter-Tall Carpets of Vertically Aligned Crystalline Carbon Nanotubes Synthesized on Copper Substrates for Electrical Applications”, E. Teblum, M. Noked, A. Kerman, M. Muallem, Y. R. Tischler, D.  Aurbach, G. Nessim, J. Phys. Chem. C, 118, p. 19345-19355, (Aug. 2014).

  26. “Reduced lasing threshold from organic dye microcavities”, G. M. Akselrod, E. R. Young, K. W. Stone, A. Palatnik, V. Bulovic, Y. R. Tischler, Physical Review B, 90, 035209, (July 2014).

  27. “Raman and photoluminescence properties of red and yellow Rubrene crystals”, M. Sinwani, Y R. Tischler, Journal of Physical Chemistry C, 118, 14528- 14533, (July 2014).

  28. “Multiprobe NSOM fluorescence”, S. Berezin, B. S. Kalanoor, H. Taha, Y. Garini, Y. R. Tischer, Nanophotonics, 3, 117- 124, (Apr. 2014).

  29. “Quantum Efficiency and Bandgap Analysis for Combinatorial Photovoltaics: Sorting Activity of Cu–O Compounds in All-Oxide Device Libraries”, A. Anderson, Y. Bouhadana,H. Barad, B. Kupfer, E. Rosh-Hodesh, H. Aviv, Y. R. Tischler, S. Rühle, A. Zaban, ACS Comb. Sci., 16 (2): 53–65 (Jan. 2014).

  30. “Basic model of absorption depth and injection levels in silicon under intermediate illumination levels”, R. Aharoni, M. Sinvani, Y. R. Tischler, Z. Zalevsky, Optics Communications, 291: 1-6 (Mar. 2013).

  31. “Exciton-exciton annihilation in organic polariton microcavities”, G. M. Akselrod, Y. R. Tischler, E. R. Young, D. G. Nocera, V. Bulović, Physical Review B, 82 (11) Art. No. 113106 (Sept. 2010)

  32. “Efficient Förster energy transfer from phosphorescent organic molecules to J-aggregate thin films”, Y. Shirasaki, P. O. Anikeeva, J. R. Tischler, M. S. Bradley, V. Bulović, Chemical Physics Letters, 485 (1-3): 243-246 (Jan. 2010).

  33. “Electrostatic Formation of Quantum Dot/J-aggregate FRET Pairs in Solution”, J. E. Halpert, J. R. Tischler, G. Nair; B. J. Walker, W. H. Liu, V. Bulović, M. G. Bawendi, The Journal of Physical Chemistry C, 113 (23): 9986-9992 (June 2009).

  34. “Synthesis of J-Aggregating Dibenz[a,j]anthracene-Based Macrocycles,” J. M. W. Chan, J. R. Tischler, S. E. Kooi, V. Bulović, T. M. Swager, Journal of the American Chemical Society, 131 (15): 5659-5666 (Apr. 2009).

  35. “Predicting the linear optical response of J-aggregate microcavity exciton-polariton devices,” M. S. Bradley, J. R. Tischler, Y. Shirasaki, V. Bulović, Physical Review B, 78 (19): Art. No. 193305 (Nov. 2008).

  36. “Using integrated optical feedback to counter pixel aging and stabilize light output of Organic LED display technology,” J. Yu, J. R. Tischler, C. G. Sodini, V. Bulović,  IEEE Journal of Display Technology, 4 (3) 308 (Sept. 2008)

  37. “Highly efficient resonant coupling of optical excitations in hybrid organic/inorganic semiconductor nanostructures,” Q. Zhang, T. Atay, J. R. Tischler, M. S. Bradley, V. Bulović, A. V. Nurmikko, Nature Nanotechnology, 2 (9): 555-559 (Sept. 2007).

  38. “Solid state cavity QED: Strong coupling in organic thin films,” J. R. Tischler, M. S. Bradley, Q. Zhang, T. Atay, A. Nurmikko, V. Bulović, Organic Electronics, 8 (2-3): 94-113 (Apr. - June 2007).

  39. “Critically coupled resonators in vertical geometry using a planar mirror and a 5 nm thick absorbing film,” J. R. Tischler, M. S. Bradley, V. Bulović, Optics Letters, 31 (13): 2045-2047 (July 2006).

  40. “Highly efficient blue electroluminescence from poly(phenylene ethynylene) via energy transfer from a hole-transport matrix,” C. A. Breen, J. R. Tischler, V. Bulović, T. M. Swager, Advanced Materials, 17 (16) 1981 (Aug. 2005).

  41. “Layer-by-layer J-aggregate thin films with a peak absorption constant of 106 cm-1”, M. S. Bradley, J. R. Tischler, V. Bulović, Advanced Materials, 17 (15) 1881 (Aug. 2005).

  42. “Strong Coupling in a microcavity LED, ”J. R. Tischler, M. S. Bradley, V. Bulović, J. H., A. Nurmikko, Physical Review Letters, 95 (3): Art. No. 036401 (July 2005).

  43. “Exciton-polariton dynamics in a transparent organic semiconductor microcavity,” J. H. Song, Y. He, A. V. Nurmikko, J. Tischler, V. Bulović, Physical Review B, 69 (23): Art. No. 235330 (June 2004).

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