BIDISHA ROY, Ph.D.
Email: bidishae@gmail.com
bidisha.roy@woxsen.edu.in
Phone: +91. 7044141766
Director, Center for Ǫuantum Enabled Science and Technologies Faculty of Physics,
School of Science, Woxsen University, Kamkole Hyderabad, India.
Research Background and Interests:
  • Fundamental and applied physics of quantum confined excitonic systems :
    :
    optical, magneto-optical, and time-resolved investigations to study and manipulate the nature and dynamics of optical processes in quantum dot-based heterostructures and superlattices.
  • Photonic and Plasmonic Metasurfaces :
    :
    Light-matter interactions in engineered photonic environments.
  • Novel excitonic- photonic/plasmonic integrated systems :
    :
    2D TMDCs, Perovskites, semiconductor quantum dots, etc. in designed photonic and plasmonic environments.

Ph.D. Synopsis:

  • Thesis topic: Optical and Magneto-Optical Properties of type-II Excitons in ZnTe/ZnSe Stacked Submonolayer Quantum Dots, Advisor: Prof. I. L. Kuskovsky at The City University of New York, 2007-2013.
  • Summary: Fundamental physical and material properties of type-II excitons in stacked ZnTe/ZnSe submonolayer quantum dots were studied via investigating light matter interactions in such systems. The samples, grown via combination of molecular beam epitaxy (MBE) and migration enhanced epitaxy (MEE) were studied using photoluminescence (PL), time-resolved PL (TRPL) and PL in the presence of externally applied magnetic field (Magneto-PL) keeping in mind the fundamental and advanced interests for such and related systems in quantum physics of semiconductors and photovoltaics. Optical excitonic Aharonov-Bohm effect was studied in great details that revealed the possibility of storage and retrieval of excitons for quantum information-related applications.

Current Research Proposals/ Projects/ Collaborations :

  • With Prof. Ursula Wurstbauer (Professor, University of Muenster) on optical excitonic AB effect in Moire trapped holes in 2D TMDCs (Indo-German WISER grant 2025 application underway)
  • With Dr. Ashish Arora (Assistant Professor, IISER Pune) and Prof. Bhavtosh Bansal (Professor, IISER Kolkata) on magneto-optics of 2D TMDCs and semiconductor QD-based excitonic systems, respectively.
  • With Dr. Harish N. S. Krishnamoorthy (Reader, TIFR Hyderabad) on Plasmonic Metasurfaces.
  • With Prof. Igor Kuskovsky (Professor, The City University of New York) and Dr. Siddharth Dhomkar (Assistant Professor, IIT Madras) on open questions with type-II QD-based quantum heterostructures and defect states in HBN, respectively.
  • With Prof. Xiaoze Liu (Professor, Physics and Technology, Wuhan University) on cavity-confined 2D materials.

Technical Expertise :

  • ✓ Proficient in optical spectroscopic techniques- optical steady state and time resolved measurements.
  • ✓ Low temperature and temperature dependent optical, magneto and electro- optical and standard transport measurements.
  • ✓ Exfoliation and transfer techniques of 2D materials on to different substrates.
  • ✓ Nanofabrication techniques: electron beam writing and imaging for photonic and plasmonic structures.
  • ✓ Design and optimization of photonic and plasmonic nanostructures - Nanophotonic FDTD based Simulation– Lumerical and other problem specific user based softwares.
  • ✓ Focused Ion Beam (FIB) writing, imaging and deposition techniques.
  • ✓ Atomic Force Microscopy, Scanning Electron Microscopy, Angle dependent ellipsometry (with imaging).
  • ✓ Installation and operation of (9T) superconducting magnet at Queens College of CUNY
  • ✓ Operation of (14T) superconducting magnet at National High Magnetic Field Laboratory, Tallahassee, Florida, USA.
  • ✓ Photo Lithography patterning at Laboratory of Nano and Micro Photonics, Queens College of CUNY.
  • ✓ Cleanroom experience with photo lithography, laser writing, sputtering- trained at National Institute of Standard and Technology, Gaithersburg, Maryland, USA.
  • ✓ Working experience with scanning electron microscopic (SEM), thermal evaporator, thermal chemical vapor deposition (CVD) systems, plasma enhanced CVD (PECVD) and high vacuum and cryogenic systems at various research laboratories in USA and India.
  • ✓ Optical Fiber and optical probe preparation.
  • ✓ High Power tunable UV and visible lasers (continuous wave and pulsed), diode lasers
  • ✓ Origin Pro data analysis, Matlab, Lumerical FDTD Simulations, Mathematica, Latex.

Working Experience at International Laboratories:

  • ❖ National High Magnetic Field Laboratory, Tallahassee, Florida, USA. (Magneto Optical Spectroscopic and transport measurements).
  • ❖National Institute of Standards and Technology, Gaithersburg, Maryland, USA. (Nanofabrication)
  • ❖Walter Schottky Institute, Technical University of Munich, Munich, Germany. (Nanofabrication, High resolution imaging, and Optical measurements)

Key Publications:

  • ➦Plasmonics enabled atomically thin linearly polarized emitter at room temperature: Roy. B, Blauth. M, Dhomkar. S, Kaniber. M, Menon. V. M, and Finley. J. J. https://doi.org/10.48550/arXiv.2205.12935, 2022 (Under journal submission presently.)
  • ➦Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons: Kuskovsky, I. L., Mourokh, L. G, Roy. B, Ji. H, Dhomkar. S, Ludwig. J, Smirnov. D, and Tamargo. M. C : Phys. Rev. B 95, 165445, 2017.
  • ➦Measurement and control of size and density of type-II ZnTe/ZnSe submonolayer quantum dots grown by migration enhanced epitaxy, Dhomkar. S, Ji. H, Roy.B, Deligiannakis. V, Wang. A, Tamargo. M.C, Kuskovsky. I. L.: Journ. Cryst. Grow. 422, 8-14, 2015.
  • ➦ Determination of lateral size distribution of type-II ZnTe/ZnSe stacked submonolayer quantum dots via
  • ➦ spectral analysis of optical signature of the Aharanov-Bohm excitons: Ji H, Dhomkar. S, Roy. B, Shuvayev. V, Deligiannakis. V, Tamargo, M. C., Ludwig. J, Smirnov. D, Wang. A, and Kuskovsky, I. L. : Journal of Applied Physics 116, 164308, (2014); https://doi.org/10.1063/1.4899439
  • ➦ Observation of oscillations in energy of Aharonov-Bohm excitons in type-II ZnTe/ZnSe stacked submonolayer quantum dots: Roy, B., Ji, H., Dhomkar, S., Tamargo, M. C., Kuskovsky, I. L., (2014): Physica Status Solidi (c). (Published online: DOI: 10.1002/pssc.201300601).
  • ➦ Tuning between Ǫuantum-Dot and Ǫuantum-Well-Like behaviors in Type-II ZnTe Sub-Monolayer Ǫuantum Dots by Controlling Tellurium Flux during MBE Growth: Ji, H., Roy, B., Dhomkar, S., Moug, R. T., Tamargo, M. C., Wang, A., Kuskovsky, I. L., (2013): In: Journal of Electronic Materials, vol. 42, 3297-3302.
  • ➦ Distinguishability of stacks in ZnTe/ZnSe quantum dots via spectral analysis of Aharonov-Bohm oscillations: Roy, B., Ji, H., Dhomkar, S., Cadieu, F. J., Peng, L., Moug, R., Tamargo M. C., Kuskovsky, I. L., (2013): European Physical Journal B, 86, 30629 pp.
  • ➦ Enhancement and narrowing of the Aharonov-Bohm oscillations due to built-in electric field in stacked type-II ZnTe/ZnSe quantum dots: Spectral analysis. Roy, B., Ji, H., Dhomkar, S., Cadieu, F. J., Peng, L., Moug, R., Tamargo, M. C., Kim, Y., Smirnov, D., Kuskovsky, I. L., (2012): In: Physical Review B, vol. 86, 165310 pp.
  • ➦ Determination of excitonic size with sub-nanometer precision via excitonic Aharonov-Bohm effect in type-II quantum dots. Roy, B., Ji, H., Dhomkar, S., Cadieu, F., Peng, L., Moug, R., Tamargo, M. C., Kuskovsky, I. L., (2012): In: Applied Physics Letters, vol. 100, 213114 pp.
  • ➦ Effects of Varying MBE Growth Conditions on Layered Zn-Se-Te Structures. Roy, B., Shen, A., Tamargo, M. C., Kuskovsky, I. L., (2011): In: Journal of Electronic Materials, vol. 40, 1775-1780.
  • ➦ Edited Book (In progress): Light- Matter Interactions in micro and nan

Selected Conferences, Workshops and Presentations:

  • ◈ iCOLD 25, IIT Hyderabad 2025 (Invited Talk and Session Chair for Quantum Materials).
  • ◈ ATINER Conference, Greece 2025 (Talk)
  • ◈ School of Physics, Peking University, Beijing, China, October 2019 (Seminar talk)
  • ◈ Indian Institute of Technology Kharagpur, Kharagpur, India, October 2018 (Seminar talk).
  • ◈ Indian Association for Cultivation of Sciences, Kolkata, India, October 2018 (Seminar talk).
  • ◈ Indian Institute of Science Education and Research, Kolkata, India, October 2018 (Seminar talk).
  • ◈ Indian Institute of Technology Madras, Chennai, India, September 2018 (Seminar talk).
  • ◈ Indian Institute of Science Education and Research, Tirupati, India, September 2018 (Seminar talk).
  • ◈ Center for Nano Science and Engineering, IISc Bangalore, India, September 2018 (Seminar talk).
  • ◈ Indian Institute of Science Education and Research, Pune, India, September 2018 (Seminar talk).
  • ◈ Tata Institute of Fundamental Research, Mumbai, India, August 2017 (Invited Seminar talk).
  • ◈ Network Meeting of Alexander Von Humboldt Foundation, Dresden, Germany, April 2017 (Invited talk).
  • ◈ Center for Discovery and Innovation, CCNY, New York, USA, February 2017 (Seminar Talk).
  • ◈ Wroclaw University of Technology, Wroclaw, Poland, May 2016. (Invited Seminar Talk).
  • ◈ North American MBE Conference, Princeton University, Aug. 2009. (Poster)
  • ◈ The 2010 U.S. Workshop on the Physics and Chemistry of II-VI Materials, New Orleans, Oct. 2010. (Talk).
  • ◈ 2nd Nanotoday Conference, Hawaii, December 2011. (Poster)
  • ◈ APS March Meeting, Boston, Mar. 2012. (Talk)
  • ◈ Colloquium at Queens College of CUNY, May 2012. (Invited Talk)
  • ◈ EXCON 2012, Groningen, Netherlands, Jul. 2012. (Poster)
  • ◈ The 2012 U.S. Workshop on the Physics and Chemistry of II-VI Materials, Seattle, Nov. 2012. (Talk)
  • ◈ APS March Meeting, Baltimore, March 2013. (Talk)
  • ◈ University of Pittsburgh, Pittsburgh, USA, Apr. 2013. (Invited Talk)
  • ◈ Tata Institute of Fundamental Research, Mumbai, India, Aug. 2013. (Seminar Talk)
  • ◈ Center for Functional Nanomaterials (CFN), Brookhaven National Laboratory (BNL), New York, USA, October 2013. (Invited Talk)

Peer Review Services and Professional Networks:

  • ➙ Referee of Journal of Electronic Materials, Optics Express, Physical Review journals, journal of Applied Physics, Applied Physics Letters.
  • ➙ Member of Optical Society of America, American Physical Society, Materials Research Society, and Institute of Electrical and Electronics Engineers (IEEE).
  • ➙ Member of the International Network of Alexander von Humboldt fellows.

Organizational Synergistic Activities:

  • ➦ Organizer of the 2-day workshop “Basic Tools of Quantum Computing - A Hands-on training for all” through Center for QuEST at Woxsen University (Feb -2025).
  • ➦ Organizer of Vidushika 2025 - UNESCO International Day of Women and Girls in Science at Woxsen University, with engagement from the Vice Minister of Higher Education Science and Technology, Indonesia (Feb 2025).
  • ➦ Faculty Ambassador for School of Science - SHE Leads, Women Leadership Affinity Group, Woxsen University- (2024 - ongoing) initiative towards empowering women faculty, staff, and students to develop leadership skills, discover their voices, and build confidence in navigating their professional and personal journeys. The group focuses on providing a supportive community for women in scientific academia.
  • ➦ Secretary of CUNY Optical Society of America (OSA) Student Chapter at the Graduate Center and Queens College of CUNY (2011-2013). Under the Umbrella of worldwide network of OSA we organized various interactive activities to promote research and interest in optics and photonics.
  • ➦ Creative Administration at Accademia Sangam in Milan, Italy (2017- 2019) - an initiave of Sagome Teatro Milano, worked with international art organizations enabling cross-cultural activities across Europe and India.