Characterize fundamental and quantum optical properties including colloidal nanocrystals, quantum dots, nanowires, carbon nanotubes, 2D materials, and solitary quantum defects in wide variety of solid state hosts.

Advanced Optical Imaging and Spectroscopy Capabilities include:

• Resonance Raman.
• Photoluminescence (PL).
• Time and frequency resolved PL spectroscopy.
• Time-tagged/time-correlated single photon counting.
• Electro-luminescence and photo-current imaging.

Supported Quantum Optical Capabilities include:

• Single photon quantum interference.
• Hunbury-Brown-Twiss experiments.
• Hong-Ou-Mandel experiments.

Technical Specifications:

• Trivista scanning confocal Raman microscope with a triple spectrometer (Acton Research).
• Three Oxford Instrument’s continuous flow LHe cryostats (4-500 K).
• Acton Research 1/2 meter triple spectrometer and two 1/3 meter spectrometers.
• LN₂ cooled CCD and TE cooled EMCCD array detectors covering 400–1000 nm (PI-Acton).
• 1D and 2D InGaAs Diode array covering 900–600 nm spectral range.
• Time-correlated single-photon-counting electronics (Hydraharp); multiple Si avalanched photodiodes (Perkin Elmer SPCM-50 and id Quantique id100: 300 ps and 50 ps resolution, respectively).
• Single Quantum Eos 410, Four Channel Superconducting Nanowire Single Photon Detection System (>25% QE at 1.3 µm, <50ps timing resolution).
• CW and pulse lasers covering 350 nm–1400 nm spectral range.

Contacts: Han Htoon

Research Highlights:
Tunable room-Temperature single-photon emission at telecom wavelengths from sp 3 defects in carbon nanotubes
He, X.; Hartmann, N. F.; Ma, X.; Kim, Y.; Ihly, R.; Blackburn, J. L.; Gao, W.; Kono, J.; Yomogida, Y.; Hirano, A.; Tanaka, T.; Kataura, H.; Htoon, H.; Doorn, S. K. Nature Photonics 2017, 11 (9), 577–582. doi.org/10.1038/nphoton.2017.119

Photophysics of Thermally-Assisted Photobleaching in "giant" Quantum Dots Revealed in Single Nanocrystals
Orfield, N. J.; Majumder, S.; McBride, J. R.; Yik-Ching Koh, F.; Singh, A.; Bouquin, S. J.; Casson, J. L.; Johnson, A. D.; Sun, L.; Li, X.; Shih, C. K.; Rosenthal, S. J.; Hollingsworth, J. A.; Htoon, H. ACS Nano 2018, 12 (5), 4206-4217. doi.org/10.1021/acsnano.7b07450

Carbon nanotube color centers in plasmonic nanocavities: A path to photon indistinguishability at telecom bands
Luo, Y.; He, X.; Kim, Y.; Blackburn, J. L.; Doorn, S. K.; Htoon, H.; Strauf, S. Nano Letters 2019, 19 (12), 9037–9044. doi.org/10.1021/acs.nanolett.9b04069