Feng Pan

All Publications

• Spectroscopy in Nanoscopic Cavities: Models and Recent Experiments. Annual review of physical chemistry Bourgeois, M. R., Pan, F., Anyanwu, C. P., Nixon, A. G., Beutler, E. K., Dionne, J. A., Goldsmith, R. H., Masiello, D. J. 2024; 75 (1): 509-534

  Abstract

  The ability of nanophotonic cavities to confine and store light to nanoscale dimensions has important implications for enhancing molecular, excitonic, phononic, and plasmonic optical responses. Spectroscopic signatures of processes that are ordinarily exceedingly weak such as pure absorption and Raman scattering have been brought to the single-particle limit of detection, while new emergent polaritonic states of optical matter have been realized through coupling material and photonic cavity degrees of freedom across a wide range of experimentally accessible interaction strengths. In this review, we discuss both optical and electron beam spectroscopies of cavity-coupled material systems in weak, strong, and ultrastrong coupling regimes, providing a theoretical basis for understanding the physics inherent to each while highlighting recent experimental advances and exciting future directions.

  View details for DOI 10.1146/annurev-physchem-083122-125525

  View details for PubMedID 38941525

• Solution-phase sample-averaged single-particle spectroscopy of quantum emitters with femtosecond resolution. Nature materials Shi, J., Shen, Y., Pan, F., Sun, W., Mangu, A., Shi, C., McKeown-Green, A., Moradifar, P., Bawendi, M. G., Moerner, W. E., Dionne, J. A., Liu, F., Lindenberg, A. M. 2024

  Abstract

  The development of many quantum optical technologies depends on the availability of single quantum emitters with near-perfect coherence. Systematic improvement is limited by a lack of understanding of the microscopic energy flow at the single-emitter level and ultrafast timescales. Here we utilize a combination of fluorescence correlation spectroscopy and ultrafast spectroscopy to capture the sample-averaged dynamics of defects with single-particle sensitivity. We employ this approach to study heterogeneous emitters in two-dimensional hexagonal boron nitride. From milliseconds to nanoseconds, the translational, shelving, rotational and antibunching features are disentangled in time, which quantifies the normalized two-photon emission quantum yield. Leveraging the femtosecond resolution of this technique, we visualize electron-phonon coupling and discover the acceleration of polaronic formation on multi-electron excitation. Corroborated with theory, this translates to the photon fidelity characterization of cascaded emission efficiency and decoherence time. Our work provides a framework for ultrafast spectroscopy in heterogeneous emitters, opening new avenues of extreme-scale characterization for quantum applications.

  View details for DOI 10.1038/s41563-024-01855-7

  View details for PubMedID 38589542

  View details for PubMedCentralID 5615041

• Millimeter-Scale Exfoliation of hBN with Tunable Flake Thickness for Scalable Encapsulation ACS APPLIED NANO MATERIALS McKeown-Green, A. S., Zeng, H. J., Saunders, A. P., Li, J., Shi, J., Shen, Y., Pan, F., Hu, J., Dionne, J. A., Heinz, T. F., Wu, S. M., Zheng, F., Liu, F. 2024

  View details for DOI 10.1021/acsanm.4c00412

  View details for Web of Science ID 001184723800001

• Through thick and thin: how optical cavities control spin. Nanophotonics (Berlin, Germany) Dixon, J., Pan, F., Moradifar, P., Bordoloi, P., Dagli, S., Dionne, J. 2023; 12 (14): 2779-2788

  Abstract

  When light interacts with matter by means of scattering and absorption, we observe the resulting color. Light also probes the symmetry of matter and the result is encoded in its polarization. In the special case of circularly-polarized light, which is especially relevant in nonlinear optics, quantum photonics, and physical chemistry, a critical dimension of symmetry is along the longitudinal direction. We examine recent advances in controlling circularly-polarized light and reveal that the commonality in these advances is in judicious control of longitudinal symmetry. In particular, in the use of high quality-factor modes in dielectric metasurfaces, the finite thickness can be used to tune the modal profile. These symmetry considerations can be applied in multiplexed optical communication schemes, deterministic control of quantum emitters, and sensitive detection of the asymmetry of small molecules.

  View details for DOI 10.1515/nanoph-2023-0175

  View details for PubMedID 39635484

  View details for PubMedCentralID PMC11501721

• Through thick and thin: how optical cavities control spin NANOPHOTONICS Dixon, J., Pan, F., Moradifar, P., Bordoloi, P., Dagli, S., Dionne, J. 2023

  View details for DOI 10.1515/nanoph-2023-0175

  View details for Web of Science ID 000982262200001

• Active Control of Plasmonic-Photonic Interactions in a Microbubble Cavity JOURNAL OF PHYSICAL CHEMISTRY C Pan, F., Karlsson, K., Nixon, A. G., Hogan, L. T., Ward, J. M., Smith, K. C., Masiello, D. J., Chormaic, S., Goldsmith, R. H. 2022

  View details for DOI 10.1021/acs.jpcc.2c05733

  View details for Web of Science ID 000894524600001

• Targeted synthesis of a large triazine-based [4+6] organic molecular cage: structure, porosity and gas separation CHEMICAL COMMUNICATIONS Ding, H., Yang, Y., Li, B., Pan, F., Zhu, G., Zeller, M., Yuan, D., Wang, C. 2015; 51 (10): 1976-1979

  Abstract

  Herein, we report the targeted synthesis and solid state assembly of a novel triazine-based [4+6] organic molecular cage. The tetrahedral cage features a large cavity (∼2070 Å(3)), and after desolvation, the resultant material exhibits a high Brunauer-Emmett-Teller surface area of 1181 m(2) g(-1) and also features selective adsorption of CO2 over N2.

  View details for DOI 10.1039/c4cc08883b

  View details for Web of Science ID 000348213200050

  View details for PubMedID 25532049