Staff

 Staff Scientist (2024-2025), Postdoctoral Scholar (2022-2024)

Work at OIST

• Optomechanical interactions in a coupled whispering gallery microbubble-micropendulum system
  M-C Shen, R Madugani, J Ward, C-J Yi, S Nic Chormaic and Y Yang
  submitted (2025)

• Magnetospirillum bacteria sensing using a microbubble WGM resonator
  A Jose, R Madugani, RS Kalra and S Nic Chormaic
  Proc. SPIE 13004, Nonlinear Optics and its Applications 2024, 1300403 (2024)

• Plasma microcavities - featured in highlights of optics in 2023 
  B Batish, R Gad, F Cheng, K Karlsson, R Madugani, M Douvidzon, S Nic Chormaic and T Carmon
  OPN 34, 37 (2023)

• Absorption-induced transmission in plasma microphotonics*
  B Bathish, R Gad, F Cheng, K Karlsson, R Madugani, M Douvidzon, S Nic Chormaic and T Carmon
  Nat. Commun. 14, 4535 (2023)

 Staff Scientist (2022-2025)

Work at OIST

• Atom-light interactions using optical nanofibres - A perspective [invited]
  W Li, D Brown, A Vylegzhanin, Z Shahrabifarahani, A Raj, J Du and S Nic Chormaic
  J. Phys: Photon. 6, 021002 (2024)

 Postdoctoral Scholar (2020-2024)

Work at OIST

• Towards a fictitious magnetic field trap for both ground and Rydberg state ⁸⁷Rb atoms via the evanescent field of an optical nanofiber
  A Vylegzhanin, DJ Brown, DF Kornovan, E Brion and S Nic Chormaic
  New J. Phys. 27, 073203 (2025)

• Rydberg EIT based laser lock to Zeeman sublevels with 0.6 GHz scanning range
  A Vylegzhanin, S Nic Chormaic and D Brown
  Rev. Sci. Instrum. 95, 113001 (2024)

• Atom-light interactions using optical nanofibres - A perspective [invited]
  W Li, D Brown, A Vylegzhanin, Z Shahrabifarahani, A Raj, J Du and S Nic Chormaic
  J. Phys: Photon. 6, 021002 (2024) 

• Excitation of ⁸⁷Rb Rydberg atoms to nS and nD states (n<68) via an optical nanofiber
  A Vylegzhanin, DJ Brown, A Raj, DF Kornovan, JL Everett, E Brion, J Robert and S Nic Chormaic
  Optica Quant. 1, 6 (2023)

 Staff Scientist (2020-2023)

Work at OIST

• Structural characterization of thin-walled microbubble cavities
  MZ Jalaludeen, S Li, K Tian, T Sasaki and S Nic Chormaic
  Photonics Res. 11, A19 (2023)

• Fluorescence engineering in metamaterial-assisted super-resolution localization microscope* ​ 
  KR Choi, S Li, I Ozerov, F Bedu, DH Park, BC Joo, JW Wu, S Nic Chormaic and YU Lee
  Nanophotonics 12, 2491 (2023) 

• High-sensitivity vector bend sensor based on a fiber directional coupler inscribed by a femtosecond laser*
  K Tian, M Zhang, C Zhao, H Li, S Li, Y Jiang, E Lewis, G Farrell and P Wang
  Opt. Lett. 48, 1498 (2023)

• Experimental observation of Berry phases in optical Möbius-strip microcavities* ​ 
  J Wang, S Valligatla, Y Yin, L Schwarz, M Medina-Sánchez, S Baunack, C H Lee, R Thomale, S Li, VM Fomin, L Ma and OG Schmidt
  Nat. Photon. 17, 120 (2023)

 Postdoctoral Scholar (2019-2023)

Work at OIST

• Manipulation of polarization topology using a Fabry-Perot fiber cavity with a higher-order mode optical nanofiber
  M Maeda, J Keloth and S Nic Chormaic
  Photonics Res. 11, 1029 (2023)

 Postdoctoral Scholar (2018-2022)

Work at OIST

• Machine leaner optimization of optical nanofiber-based dipole traps for cold ⁸⁷Rb atoms
  RK Gupta, JL Everett, AD Tranter, R Henke, V Gokhroo, PK Lam and S Nic Chormaic
  AVS Quantum Sci. 4, 026801 (2022)

• Observation of the ⁸⁷Rb 5S_1/2 to 4D_3/2 electric quadrupole transition at 516.6 nm mediated via an optical nanofibre
  T Ray, RK Gupta, V Gokhroo, JL Everett, T Nieddu, KS Rajasree and S Nic Chormaic
  New J. Phys. 22, 062001 (2020)

• Generation of cold Rydberg atoms at submicron distances from an optical nanofiber (Rapid Communication)
  KS Rajasree, T Ray, K Karlsson, JL Everett and S Nic Chormaic
  Phys. Rev. Res. 2, 012038(R) (2020)

 Staff Scientist (2021-2022),  JSPS Fellow (2018-2020),  Postdoctoral Scholar (2017-2018)

Work at OIST

• Enhanced directional coupling of light with a whispering gallery microcavity 
  F Lei, G Tkachenko, X Jiang, JM Ward, L Yang and S Nic Chormaic
  ACS Photonics 7, 361 (2020)

• Light-induced rotation of dielectric microparticles around an optical nanofiber 
  G Tkachenko, I Toftul, C Esporlas, A Maimaiti, F Le Kien, VG Truong and S Nic Chormaic
  Optica 7, 59 (2020)

• Spin selection in single-frequency two-photon excitation of alkali-metal atoms
  KS Rajasree, RK Gupta, V Gokhroo, F Le Kien, T Nieddu, T Ray, S Nic Chormaic and G Tkachenko
  Phys. Rev. Res. 2, 033341 (2020) 

• Polarisation control for optical nanofibres by imaging through a single lens (Editors' Suggestion)
  G Tkachenko, F Lei and S Nic Chormaic
  J. Opt. 21, 125604 (2019)

• Complete polarization control for a nanofiber waveguide using directional coupling
  F Lei, G Tkachenko, JM Ward and S Nic Chormaic
  Phys. Rev. Appl. 11, 064041 (2019)

• Ultrathin optical fibers: Guided modes, angular momentum, and applications (invited review)
  C Esporlas, G Tkachenko, VG Truong and S Nic Chormaic
  Rev. Las. Engin. 46 196 (2018)

          and more.

Patents

• Parabolic reflector based scheme for variable angle ellipsometry
  G Tkachenko, VG Truong and S Nic Chormaic
  USA Provisional Patent Filed (2019)

 Postdoctoral Scholar (2020-2022)

Work at OIST

• X-ray microcomputed tomography of 3D chaotic microcavities
  K Tian, MZ Jalaludeen, YU Lee, S Li and S Nic Chormaic
  arxiv.org/2501.06393

• Structural characterization of thin-walled microbubble cavities
  MZ Jalaludeen, S Li, K Tian, T Sasaki and S Nic Chormaic
  Photonics Res. 11, A19 (2023)

• Blue band nonlinear optics and photodarkening in silica microdevices
  K Tian, J Yu, F Lei, JM Ward, A Li, P Wang and S Nic Chormaic 
  Photonics Res. 10, 2073 (2022).

• Packaged whispering gallery resonator device based on an optical nanoantenna coupler
  A Li, K Tian, J Yu, RA Minz, JM Ward, S Mondal, P Wang and S Nic Chormaic 
  Opt. Express 29, 16879 (2021)

 Staff Scientist (2018-2021)

Work at OIST

• Dynamic multiple nanoparticle trapping using metamaterial plasmonic tweezers
  DG Kotsifaki, VG Truong and S Nic Chormaic
  Appl. Phys. Lett. 118, 021107 (2021)

• Analysis of small microplastics in coastal surface water samples of the subtropical island of Okinawa, Japan  (featured in Optics & Photonics News: Shedding Light on Marine Microplastics) 
  C Ripken, S Nic Chormaic and DG Kotsifaki
  Sci. Total Environ. 760, 143927 (2021) 

• Fast and efficient nanoparticle trapping using plasmonic connected nanoring apertures
  TD Bouloumis, DG Kotsifaki, X Han, S Nic Chormaic and VG Truong
  Nanotechnology 32, 025507 (2021)

• Fano-resonant, asymmetric, metamaterial-assisted tweezers for single nanoparticle trapping 
  DG Kotsifaki, VG Truong and S Nic Chormaic
  Nano Lett. 20, 3388 (2020)

• Plasmonic optical tweezers based on nanostructures: fundamentals, advances and prospects
  DG Kotsifaki and S Nic Chormaic
  Nanophotonics 8, 1227 (2019)

 Staff Scientist (2019-2021)

Work at OIST

• Machine leaner optimization of optical nanofiber-based dipole traps for cold ⁸⁷Rb atoms ​ 
  RK Gupta, JL Everett, AD Tranter, R Henke, V Gokhroo, PK Lam and S Nic Chormaic 
  AVS Quantum Sci. 4, 026801 (2022) 

• Rubidium atom spectral lineshapes in high intensity electric fields near an optical nanofibre
  V Gokhroo, F Le Kien and S Nic Chormaic
  J. Phys. B: At. Mol. Opt. Phys. 55, 125301 (2022)

• Spin selection in single-frequency two-photon excitation of alkali-metal atoms 
  KS Rajasree, RK Gupta, V Gokhroo, F Le Kien, T Nieddu, T Ray, S Nic Chormaic and G Tkachenko
  Phys. Rev. Res. 2, 033341 (2020) 

• Observation of the ⁸⁷Rb 5S_1/2 to 4D_3/2 electric quadrupole transition at 516.6 nm mediated via an optical nanofibre
  T Ray, RK Gupta, V Gokhroo, JL Everett, T Nieddu, KS Rajasree and S Nic Chormaic
  New J. Phys. 22, 062001 (2020) 

 Postdoctoral Scholar (2018-2020)

Work at OIST

• Fabrication of optical nanofibre-based cavities using focussed ion-beam milling - A review 
  P Romagnoli, M Maeda, JM Ward, VG Truong and S Nic Chormaic
  Appl. Phys. B  126, 111 (2020)

• Polarization-controlled cavity input-output relations
  F Lei, JM Ward, P Romagnoli and S Nic Chormaic
  Phys. Rev. Lett. 124, 103902 (2020)

 Staff Scientist (2012-2020)

Work at OIST

• Fabrication of optical nanofibre-based cavities using focussed ion-beam millling - A review 
  P Romagnoli, M Maeda, JM Ward, VG Truong and S Nic Chormaic
  Appl. Phys. B  126, 111 (2020)

• Polarization-controlled cavity input-output relations
  F Lei, JM Ward, P Romagnoli and S Nic Chormaic
  Phys. Rev. Lett. 124, 103902 (2020)

• Enhanced directional coupling of light with a whispering gallery microcavity 
  F Lei, G Tkachenko, X Jiang, JM Ward, L Yang and S Nic Chormaic
  ACS Photonics 7, 361 (2020)

• Toward real-time monitoring and control of nanoparticle properties with a microbubble resonator spectrometer*
  LT Hogan, EH Horak, JM Ward, KA  Knapper, S Nic Chormaic, and RH Goldsmith
  ACS Nano 13, 12743 (2019)

• Raman laser switching induced by cascaded light scattering
  S Kasumie, F Lei, JM Ward, X Jiang, L Yang and S Nic Chormaic
  Laser Photonics Rev. 13, 1900138 (2019)

• Excitation of whispering-gallery-modes with a "point-and-play" fiber-based, optical nano-antenna 
  JM Ward, F Lei, S Vincent, P Gupta, SK Mondal, J Fick and S Nic Chormaic
  Opt. Lett. 44, 3386 (2019)

• Complete polarization control for a nanofiber waveguide using directional coupling
  F Lei, G Tkachenko, JM Ward and S Nic Chormaic
  Phys. Rev. Appl. 11, 064041 (2019)
  
  and more.

Patents

• Nanopositioner and method of making 
  RMJ Murphy, F Lei, J Ward, S Nic Chormaic, Y Yang
  United States Patent Application Publication US2019/0033527 A1

 Postdoctoral Scholar (2019-2020)

Work outside OIST

• Dynamical analysis of modal coupling in rare-earth whispering-gallery-mode microlasers*
  J-B Ceppe, P Féron, M Mortier and Y Dumeige
  Phys. Rev. Appl. 11, 064028 (2019)

   

 Postdoctoral Scholar (2016-2019)

Work at OIST

• Polarization-controlled cavity input-output relations
  F Lei, JM Ward, P Romagnoli and S Nic Chormaic
  Phys. Rev. Lett. 124, 103902 (2020)

• Enhanced directional coupling of light with a whispering gallery microcavity 
  F Lei, G Tkachenko, X Jiang, JM Ward, L Yang and S Nic Chormaic
  ACS Photonics 7, 361 (2020)

• Polarisation control for optical nanofibres by imaging through a single lens (Editors' Suggestion)
  G Tkachenko, F Lei and S Nic Chormaic
  J. Opt. 21, 125604 (2019)

• Raman laser switching induced by cascaded light scattering 
  S Kasumie, F Lei, JM Ward, X Jiang, L Yang and S Nic Chormaic
  Laser Photonics Rev. 13, 1900138 (2019)

• Excitation of whispering-gallery-modes with a "point-and-play" fiber-based, optical nano-antenna 
  JM Ward, F Lei, S Vincent, P Gupta, SK Mondal, J Fick and S Nic Chormaic
  Opt. Lett. 44, 3386 (2019)

• Complete polarization control for a nanofiber waveguide using directional coupling
  F Lei, G Tkachenko, JM Ward and S Nic Chormaic
  Phys. Rev. Appl. 11, 064041 (2019)
  
  and more.

Patents

• Nanopositioner and method of making 
  RMJ Murphy, F Lei, J Ward, S Nic Chormaic, Y Yang
  United States Patent Application Publication US2019/0033527 A1

 Postdoctoral Scholar (2015-2019)

Work at OIST

• Spin selection in single-frequency two photon excitation of alkali-metal atoms
  KS Rajasree, RK Gupta, V Gokhroo, F Le Kien, T Nieddu, T Ray, S Nic Chormaic and G Tkachenko
  Phys. Rev. Res. 2, 033341 (2020) 

• Observation of the ⁸⁷Rb 5S_1/2 to 4D_3/2 electric quadrupole transition at 516.6 nm mediated via an optical nanofibre
  T Ray, RK Gupta, V Gokhroo, JL Everett, T Nieddu, KS Rajasree and S Nic Chormaic
  New J. Phys. 22, 062001 (2020) 

• Generation of cold Rydberg atoms at submicron distances from an optical nanofiber (Rapid Communication)
  KS Rajasree, T Ray, K Karlsson, JL Everett and S Nic Chormaic
  Phys. Rev. Res. 2, 012038(R) (2020)

• Simple, narrow, and robust atomic frequency reference at 993 nm exploiting the rubidium (Rb) 5S_1/2 to 6S_1/2 transition using one-color two-photon excitation 
  T Nieddu, T Ray, KS Rajasree, R Roy and S Nic Chormaic
  Opt. Express 27, 6528 (2019)

• Enhancement of the quadrupole interaction of an atom with guided light of an ultrathin optical fiber
  F Le Kien, T Ray, T Nieddu, T Busch and S Nic Chormaic
  Phys. Rev. A 97, 013821 (2018)

 Postdoctoral Scholar (2015-2018)

Work at OIST

• Sequential trapping of single nanoparticles using a gold plasmonic nanohole array
  X Han, VG Truong, PS Thomas and S Nic Chormaic
  Photon. Res. 6, 981 (2018)

• Efficient microparticle trapping with plasmonic annular aperture arrays
  X Han, VG Truong and S Nic Chormaic
  Nano Futures 2, 035007 (2018)

• Fluorescence from a single Symbiodinium cell
  C Guzman, X Han, E Shoguchi and S Nic Chormaic
  Methods Appl. Fluoresc. 6, 035033 (2018)

 Postdoctoral Scholar (2016-2018)

Work at OIST

• Tailoring a nanofiber for enhanced photon emission and coupling efficiency from single quantum emitters
  W Li, J Du and S Nic Chormaic
  Opt. Lett. 43, 1674 (2018)

• Optical nanofiber-based cavity induced by periodic air-nanohole arrays
  W Li, J Du, VG Truong and S Nic Chormaic
  Appl. Phys. Lett. 110, 253102 (2017)

 Postdoctoral Scholar (2015-2018)

Work at OIST

• Tailoring a nanofiber for enhanced photon emission and coupling efficiency from single quantum emitters
  W Li, J Du and S Nic Chormaic
  Opt. Lett. 43, 1674 (2018)

• Optical nanofiber-based cavity induced by periodic air-nanohole arrays
  W Li, J Du, VG Truong and S Nic Chormaic
  Appl. Phys. Lett. 110, 253102 (2017)

 Postdoctoral Scholar (2011-2017)

Work at OIST

• Nanoparticle sensing beyond evanescent field interaction with a quasi-droplet microcavity
  JM Ward, Y Yang, F Lei, X-C Yu, Y-F Xiao and S Nic Chormaic
  Optica 5, 674 (2018)

• Toward visible frequency comb generation using a hollow WGM resonator (invited review)
  S Kasumie, Y Yang, JM Ward and S Nic Chormaic
  Rev. Las. Engin. 46, 92 (2018)

• Cavity ring-up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator
  Y Yang, R Madugani, S Kasumie, JM Ward and S Nic Chormaic
  in book: Exploring the World with the Laser, pp. 629-646, Springer International Publishing, Meschede, Dieter, Udem, Thomas, Esslinger, Tilman (Eds.) (2018)
  
  and more.

Patents

• Nanopositioner and method of making 
  RMJ Murphy, F Lei, J Ward, S Nic Chormaic, Y Yang
  United States Patent Application Publication US2019/0033527 A1

 Research Technician (2016-2017)

 Research Technician (2015-2016)

 JSPS Fellow (2013-2014) , Postdoctoral Scholar (2014-2015)

Work at OIST

• Highly tunable plasmonic nanoring arrays for nanoparticle manipulation and detection
  M Sergides, VG Truong and S Nic Chormaic
  Nanotechnology 27, 365301 (2016)

• Optical trapping and manipulation of micrometer and submicrometer particles
  M Daly, M Sergides and S Nic Chormaic
  Laser & Photonics Reviews 9, 309 (2015) 

 Postdoctoral Scholar (2012-2015)

Work at OIST

• Higher order microfibre modes for dielectric particle trapping and propulsion
  A Maimaiti, VG Truong, M Sergides, I Gusachenko and S Nic Chormaic
  Scientific Reports 5, 9077 (2015)

• Selective particle trapping and optical binding in the evanescent field of an optical nanofiber
  MC Frawley, I Gusachenko, VG Truong, M Sergides and S Nic Chormaic
  Opt. Exp. 22, 16322 (2014)

 Postdoctoral Scholar (2012-2015)

Work at OIST

• Temperature measurement of cold atoms using transient absorption of a resonant probe through an optical nanofibre
  R Kumar, V Gokhroo, VB Tiwari and S Nic Chormaic
  J. Opt. 18, 115401 (2016)  

• Optical nanofibres and neutral atoms (invited topical review)  Selected as "Paper of the Week".
  Acknowledged by IOP as a top-cited review article of 2016
  T Nieddu, V Gokhroo and S Nic Chormaic
  J. Opt. 18, 053001 (2016)

• Multi-level, cascaded electromagnetically induced transparency in cold atoms using an optical nanofibre interface
  R Kumar, V Gokhroo and S Nic Chormaic
  New J. Phys. 17, 123012 (2015)

• Autler-Townes splitting via frequency up-conversion at ultralow-power levels in cold ⁸⁷Rb atoms using an optical nanofiber
  R Kumar, V Gokhroo, K Deasy and S Nic Chormaic
  Phys. Rev. A 91, 053842 (2015)

• Interaction of laser-cooled ⁸⁷Rb atoms with higher order modes of an optical nanofibre
  R Kumar, V Gokhroo, K Deasy, A Maimaiti, MC Frawley, C Phelan and S Nic Chormaic
  New J. Phys. 17, 013026 (2015)

Technician (2012-2015)

 Research Assistant (2014-2015)

 Postdoctoral Scholar (2012-2015)

Work at OIST

• Autler-Townes splitting via frequency up-conversion at ultralow-power levels in cold ⁸⁷Rb atoms using an optical nanofiber
  R Kumar, V Gokhroo, K Deasy and S Nic Chormaic
  Phys. Rev. A 91, 053842 (2015)

• Interaction of laser-cooled ⁸⁷Rb atoms with higher order modes of an optical nanofibre
  R Kumar, V Gokhroo, K Deasy, A Maimaiti, MC Frawley, C Phelan and S Nic Chormaic
  New J. Phys. 17, 013026 (2015)

• Nanostructured optical nanofibre for atom trapping
  M Daly, VG Truong, CF Phelan, K Deasy and S Nic Chormaic
  New J. Phys. 16, 053052 (2014)

Postdoctoral Scholar (2012-2014)

Work at OIST

• Interaction of laser-cooled ⁸⁷Rb atoms with higher order modes of an optical nanofibre
  R Kumar, V Gokhroo, K Deasy, A Maimaiti, MC Frawley, C Phelan and S Nic Chormaic
  New J. Phys. 17, 013026 (2015)

• Nanostructured optical nanofibre for atom trapping
  M Daly, VG Truong, CF Phelan, K Deasy and S Nic Chormaic
  New J. Phys. 16, 053052 (2014)

Research Assistant (2013-2014)

Work at OIST

• Hollow core, whispering gallery resonator sensors (invited review)
  JM Ward, N Dhasmana and S Nic Chormaic
  Eur. Phys. J. Special Topics 223, 1917 (2014) 

Technician (2012-2013)