Ning Liu


 
researcher

Biography

Dr. Ning Liu received a B.S. degree in Physics from Peking University, China, in 1999 and a Ph.D. degree in Condensed Matter Physics from University of California at Irvine in 2005. Prior to joining the University of Limerick,Ireland as a lecturer in 2013, she worked as postdoctoral research fellow in UK, Canada, China, and Ireland. She has specialties in scanning probe microscopy and ultrafast spectroscopy and microscopy. Her current research interests focus on nanophotonics and plasmonics. She has published 43 journal articles, including papers in Nature nanotechnology, Nature chemistry, Nature Materials, Physical review letters, Nano Letters, ACS Photonics etc.For a full list of publications, please visit: https://scholar.google.com/citations?user=QgUds54AAAAJ&hl=en

Research Interests

1. Light emitting diodes and lasers by electric field assisted semiconductor nanorod assemblies
The market for new types of displays based on light emitting diode (LED) technologies (i.e. organic LEDs (OLEDs) and quantum-dot LEDs (QD-LEDs)) is expected to reach more than $21 billion by 2020. Among these two technologies, QD-LEDs are expected to grow with a remarkable CAGR exceeding 60% and will make a major impact on the TV market in the near future. In collaboration with our colleagues in Chemistry, the group aims to develop a novel technology to fabricate low-cost, electrically pumped light sources such as LEDs and lasers with unprecedented high performance based on state-of-the-art nanomaterial assembly techniques. The nanorod (NR)-based LEDs we currently work on share the same advantages offered by QD-LEDs, such as low-cost of production, easy processing (in solution), ability to control and tune its emission wavelength, and high colour quality. However, they can outperform QD-LEDs owing to their unique geometry and size advantage, which lead to higher brightness and can afford larger operation current.


Figure 1 (details in ref. 1)

2.
Gain assisted surface plasmon propagation and resonances
 
Information and communication technology (ICT) has been driven by constant miniaturisation to achieve smaller and faster devices. The industry has reached a fundamental material barrier as feature size decreases below 10 nm. In this regime the conventional material properties needed for electron transport are fundamentally changed due to the parasitic capacitance and signal propagation delay. To sustain our rapidly increasing need for processing power, light is proposed to transport information on-chip. Light can carry more information by offering much larger signal bandwidth via parallelism of wavelength division multiplexing at very high clock rates. However, conventional optical components cannot reach the same integration density as that for integrated electronics due to diffraction limits of light. One of the current research interests of the group is to develop novel materials and exploit new concepts to realize optical computation in a scalable and cascadable manner with low energy consumption, without compromising the integration density. One solution to the above problem is to use propagating surface plasmons to carry the optical information. Surface plasmons can meet the large bandwidth demands by high-performance computation while still maintain high integration density.


Figure 2. (details in ref. 3) 

The group tries to accomplish the above goal by endeavouring in the following four aspects: (1) Exploit the new concept of ‘hot’ electron transfer at metal-insulator-semiconductor surface to realize low threshold signal amplification in plasmonic waveguides; (2) Explore surface plasmon enhanced energy conversion through nonlinear process; (3) Utilize these novel materials as building blocks to construct multi-terminal plasmonic networks to perform logic functions with low energy consumption, (4) Explore top-down and bottom-up fabrication methods to achieve large-scale integration of plasmonic lasers and waveguides.  


Figure 3. (details in ref. 2)

References:
1.      P. Liu, S. Singh, Y. Guo, J.-J. Wang, H. X. Xu, C. Silien, *N. Liu and K. M. Ryan, ‘Assembling Ordered Nanorod Superstructures and Their Application as Microcavity Lasers’, Scientific Reports, 7:43884 (2017).

2.      N. Liu, A. Gocalinska, J. Justice, F. Gity, I. Povey, B. McCarthy, M. Pemble, E. Pelucchi, H. Wei, C. Silien, H. X. Xu, and B. Corbett, ‘Lithographically defined, room temperature low threshold red-emitting subwavelength hybrid plasmonic lasers’, Nano Lett., 16, 7822–7828 (2016).

3.      N. Liu, H. Wei, J. Li, Z. X. Wang, X. R. Tian, A. L. Pan, and H. X. Xu, ‘Plasmonic Amplification with Ultra-High Optical Gain at Room Temperature’, Scientific Reports 3, 1967 (2013).

4.     
N. Liu, Z. P. Li, and H. X. Xu, ‘Polarization dependent study on propagating surface plasmons in silver nanowires launched by a near field scanning optical fiber tip’, Small 8, 2641 (2012).


5.     
H. Wei, Z. P. Li, X. R. Tian, Z. X. Wang, F. Z. Cong, N. Liu, S. P. Zhang, P. Nordlander, N. J. Halas, and H. X. Xu, ‘Quantum dot-based local field imaging reveals plasmon-based interferometric logic in silver nanowire networks’, Nano Lett11, 471-475 (2011).
   

Peer Reviewed Journals

  Year Publication
2020 'Spectral drifts in surface textured Fe3O4-Au, core-shell nanoparticles enhance spectra-selective photothermal heating and scatter imaging'
Brennan G.;Thorat N.D.;Pescio M.;Bergamino S.;Bauer J.;Liu N.;Tofail S.A.M.;Silien C. (2020) 'Spectral drifts in surface textured Fe3O4-Au, core-shell nanoparticles enhance spectra-selective photothermal heating and scatter imaging'. Nanoscale, 12 (23):12632-12638 [DOI] [Details]
2019 'Synthesis and Characterization of CuZnSe2 Nanocrystals in Wurtzite, Zinc Blende, and Core-Shell Polytypes'
Ren H.;Wang M.;Li Z.;Laffir F.;Brennan G.;Sun Y.;Stokes K.;Geaney H.;O'Reilly E.;Gao P.;Liu N.;McCarthy C.;Ryan K. (2019) 'Synthesis and Characterization of CuZnSe2 Nanocrystals in Wurtzite, Zinc Blende, and Core-Shell Polytypes'. Chemistry Of Materials, [DOI] [Details]
2019 'Analytical and approximation approaches to solve the hybrid plasmonic–plasmonic only transition of the TM0 mode in a dielectric-semiconductor-insulator-metal four layer structure'
Ning Liu (2019) 'Analytical and approximation approaches to solve the hybrid plasmonic–plasmonic only transition of the TM0 mode in a dielectric-semiconductor-insulator-metal four layer structure'. 2 (11):3323-3336 [Details]
2019 'Input coupling enhancement through antenna incorporation in thin Au-mica trench waveguides'
Pita I.;Kumbham M.;Gleeson M.;Belochapkine S.;Ryan K.;Silien C.;Liu N. (2019) 'Input coupling enhancement through antenna incorporation in thin Au-mica trench waveguides'. Journal Of The Optical Society Of America B-Optical Physics, 36 (11):2954-2961 [DOI] [Details]
2018 'Comparative analysis of metals and alternative infrared plasmonic materials'
Hsieh, WT;Wu, PC;Khurgin, JB;Tsai, DP;Liu, N;Sun, G (2018) 'Comparative analysis of metals and alternative infrared plasmonic materials'. Acs Photonics, 5 :2541-2548 [DOI] [ULIR Link] [Details]
2018 'Surface plasmon propagation enhancement via bowtie antenna incorporation in Au- mica block waveguides'
Pita, IA;Kumbham, M;Schmidt, M;Gleeson, M;Ryan, KM;Silien, C;Liu, N (2018) 'Surface plasmon propagation enhancement via bowtie antenna incorporation in Au- mica block waveguides'. Applied Optics, 57 :50-56 [DOI] [Details]
2018 'Label-free multimodal coherent anti-Stokes Raman scattering analysis of microparticles in unconstrained microfluidics'
O'Dwyer, K;Mouras, R;Mani, AA;Rice, D;Gleeson, M;Liu, N;Tofail, SAM;Silien, C (2018) 'Label-free multimodal coherent anti-Stokes Raman scattering analysis of microparticles in unconstrained microfluidics'. Applied Optics, 57 :32-36 [DOI] [Details]
2018 'Low loss photonic nanocavity via dark magnetic dipole resonant mode near metal'
Liu, N;Silien, C;Sun, G;Corbett, B (2018) 'Low loss photonic nanocavity via dark magnetic dipole resonant mode near metal'. Scientific Reports, 8 [DOI] [Details]
2018 'APTES Duality and Nanopore Seed Regulation in Homogeneous and Nanoscale-Controlled Reduction of Ag Shell on SiO2 Microparticle for Quantifiable Single Particle SERS'
Rice, D;Mouras, R;Gleeson, M;Liu, N;Tofail, SAM;Soulimane, T;Silien, C (2018) 'APTES Duality and Nanopore Seed Regulation in Homogeneous and Nanoscale-Controlled Reduction of Ag Shell on SiO2 Microparticle for Quantifiable Single Particle SERS'. Acs Omega, 3 :13028-13035 [DOI] [ULIR Link] [Details]
2018 'Control of piezoelectricity in amino acids by supramolecular packing'
Guerin, S,Stapleton, A,Chovan, D,Mouras, R,Gleeson, M,McKeown, C,Noor, MR,Silien, C,Rhen, FMF,Kholkin, AL,Liu, N,Soulimane, T,Tofail, SAM,Thompson, D (2018) 'Control of piezoelectricity in amino acids by supramolecular packing'. Nature materials, 17 [DOI] [Details]
2017 'Spatial-domain filter enhanced subtraction microscopy and application to mid-IR imaging'
Kumbham, M,Mouras, R,Mani, A,Daly, S,O'Dwyer, K,Toma, A,Bianchini, P,Diaspro, A,Liu, N,Tofail, SAM,Silien, C (2017) 'Spatial-domain filter enhanced subtraction microscopy and application to mid-IR imaging'. Optics Express, 25 :13145-13152 [DOI] [ULIR Link] [Details]
2017 'Assembling Ordered Nanorod Superstructures and Their Application as Microcavity Lasers'
Liu, P,Singh, S,Guo, YN,Wang, JJ,Xu, HX,Silien, C,Liu, N,Ryan, KM (2017) 'Assembling Ordered Nanorod Superstructures and Their Application as Microcavity Lasers'. Scientific Reports, 7 [DOI] [ULIR Link] [Details]
2017 'A method to overcome the diffraction limit in infrared microscopy using standing waves in an attenuated total reflection configuration'
Hendaoui, N,Mani, A,Liu, N,Tofail, SM,Silien, C,Peremans, A (2017) 'A method to overcome the diffraction limit in infrared microscopy using standing waves in an attenuated total reflection configuration'. Optics Communications, 382 :574-579 [DOI] [Details]
2016 'Doubling the far-field resolution in mid-infrared microscopy'
Kumbham, M,Daly, S,O'Dwyer, K,Mouras, R,Liu, N,Mani, A,Peremans, A,Tofail, SM,Silien, C (2016) 'Doubling the far-field resolution in mid-infrared microscopy'. Optics Express, 24 :24377-24389 [DOI] [ULIR Link] [Details]
2016 'Heteroaggregation assisted wet synthesis of core-shell silver-silica-cadmium selenide nanowires'
Pita, IA,Singh, S,Silien, C,Ryan, KM,Liu, N (2016) 'Heteroaggregation assisted wet synthesis of core-shell silver-silica-cadmium selenide nanowires'. Nanoscale, 8 :1200-1209 [DOI] [Details]
2016 'Far-Field Subdiffraction Imaging of Semiconductors Using Nonlinear Transient Absorption Differential Microscopy'
Liu, N,Kumbham, M,Pita, I,Guo, Y,Bianchin, P,Diaspro, A,Tofail, SAM,Peremans, A,Silien, C (2016) 'Far-Field Subdiffraction Imaging of Semiconductors Using Nonlinear Transient Absorption Differential Microscopy'. Acs Photonics, 3 :478-485 [DOI] [Details]
2016 'Lithographically Defined, Room Temperature Low Threshold Subwavelength Red-Emitting Hybrid Plasmonic Lasers'
Liu, N,Gocalinska, A,Justice, J,Gity, F,Povey, I,McCarthy, B,Pemble, M,Pelucchi, E,Wei, H,Silien, C,Xu, HX,Corbett, B (2016) 'Lithographically Defined, Room Temperature Low Threshold Subwavelength Red-Emitting Hybrid Plasmonic Lasers'. Nano Letters, 16 :7822-7828 [DOI] [Details]
2013 'High resolution imaging with differential infrared absorption micro-spectroscopy'
Pita, I,Hendaoui, N,Liu, N,Kumbham, M,Tofail, SAM,Peremans, A,Silien, C (2013) 'High resolution imaging with differential infrared absorption micro-spectroscopy'. Optics Express, 21 :25632-25642 [DOI] [ULIR Link] [Details]
2013 'Plasmonic Amplification with Ultra-High Optical Gain at Room Temperature'
Ning Liu, Hong Wei, Jing Li, Zhuoxian Wang, Xiaorui Tian, Anlian Pan, and Hongxing Xu (2013) 'Plasmonic Amplification with Ultra-High Optical Gain at Room Temperature'. Scientific Reports, 3 [Details]
2012 'Polarization dependent study on propagating surface plasmons in silver nanowires launched by a near field scanning optical fiber tip'
Ning Liu, Zhipeng Li, and Hongxing Xu (2012) 'Polarization dependent study on propagating surface plasmons in silver nanowires launched by a near field scanning optical fiber tip'. Small, 8 [Details]
2012 'A framework for far-field infrared absorption microscopy beyond the diffraction limit'
Silien, C,Liu, N,Hendaoui, N,Tofail, SAM,Peremans, A (2012) 'A framework for far-field infrared absorption microscopy beyond the diffraction limit'. Optics Express, 20 :29694-29704 [DOI] [ULIR Link] [Details]
2012 'Nanoelectromechanical devices in a fluidic environment'
O. Svitelskiy, V. Sauer, D. Vick, K-M. Cheng, N. Liu, M. R. Freeman, and W. K. Hiebert (2012) 'Nanoelectromechanical devices in a fluidic environment'. Physical Review E, 85 [Details]
2012 'Propagating waves in quasi-one dimensional MoO3 ribbons investigated by Raman spectroscopy and scanning near-field optical microscope'
Zhipeng Li, Ning Liu, Zhilin Yang and Bin Dong (2012) 'Propagating waves in quasi-one dimensional MoO3 ribbons investigated by Raman spectroscopy and scanning near-field optical microscope'. Journal Of Applied Physics, 111 [Details]
2011 'Dynamic Chiral Flipping within Strongly Chemisorbed Molecular Monolayers at Surfaces'
Ning Liu, George R. Darling, and Rasmita Raval (2011) 'Dynamic Chiral Flipping within Strongly Chemisorbed Molecular Monolayers at Surfaces'. Chemical Communications, 47 [Details]
2011 'Quantum dot-based local field imaging reveals plasmon-based interferometric logic in silver nanowire networks'
Hong Wei, Zhipeng Li, Xiaorui Tian, Zhuoxian Wang, Fengchi Cong, Ning Liu, Shunping Zhang, Peter Nordlander, Naomi J. Halas, and Hongxing Xu (2011) 'Quantum dot-based local field imaging reveals plasmon-based interferometric logic in silver nanowire networks'. Nano Letters, 11 :471-475 [Details]
2009 'Drastic symmetry breaking in supramolecular organization of enantiomerically unbalanced monolayers at surfaces'
S. Haq, N. Liu, Vincent Humblot, A. P. J. Jansen, and R. Raval (2009) 'Drastic symmetry breaking in supramolecular organization of enantiomerically unbalanced monolayers at surfaces'. Nature Chemistry, 1 [Details]
2009 'Drastic symmetry breaking in supramolecular organization of enantiomerically unbalanced monolayers at surfaces'
O. Svitelskiy, V. Sauer, N. Liu, K-M. Cheng, E. Finley, M. R. Freeman, and W. K. Hiebert (2009) 'Drastic symmetry breaking in supramolecular organization of enantiomerically unbalanced monolayers at surfaces'. Physical Review Letters, 103 [Details]
2009 'Semiconducting polymer waveguides for end-fired ultra-fast optical amplifiers'
N. Liu, A. Ruseckas, N. Montgomery, I. D. W. Samuel, and G. A. Turnbull (2009) 'Semiconducting polymer waveguides for end-fired ultra-fast optical amplifiers'. Optics Express, 17 [Details]
2008 'Time Domain Control of Ultrahigh Frequency Nanomechanical Systems'
N. Liu, F. Giesen, M. Belov, J. Losby, J. Moroz, A. E. Fraser, G. McKinnon, T. J. Clement, V. Sauer, W. K. Hiebert, and M. R. Freeman (2008) 'Time Domain Control of Ultrahigh Frequency Nanomechanical Systems'. Nature Nanotechnology, 3 [Details]
2008 'A simple cell for the analysis of nanoelectromechanical systems under gas pressure'
O. Svitelskiy, N. Liu, V. Sauer, K-M. Cheng, E. Finley, M. Belov, M. R. Freeman, and W. K. Hiebert (2008) 'A simple cell for the analysis of nanoelectromechanical systems under gas pressure'. Review Of Scientific Instruments, 79 [Details]
2008 'Reversible Switching among Three Adsorbate Configurations in a Single [2.2]Paracyclophane-Based Molecule'
Silien, C; Liu, N; Ho, W; Maddox, JB; Mukamel, S; Liu, B; Bazan, GC (2008) 'Reversible Switching among Three Adsorbate Configurations in a Single [2.2]Paracyclophane-Based Molecule'. NANO LETTERS, 8 :208-213 [Details]
2007 'Chemical imaging of single 4,7,12,15-tetrakis[2.2]paracyclophane by spatially resolved vibrational spectroscopy'
Liu, N; Silien, C; Ho, W; Maddox, JB; Mukamel, S; Liu, B; Bazan, GC (2007) 'Chemical imaging of single 4,7,12,15-tetrakis[2.2]paracyclophane by spatially resolved vibrational spectroscopy'. JOURNAL OF CHEMICAL PHYSICS, 127 [Details]
2007 'Direct visualization of enantiospecific substitution of chiral guest molecules into heterochiral molecular assemblies at surfaces'
Ning Liu, Sam Haq, George R. Darling, and Rasmita Raval (2007) 'Direct visualization of enantiospecific substitution of chiral guest molecules into heterochiral molecular assemblies at surfaces'. Angewandte Chemie-International Edition, 46 [Details]
2006 'Simulation of Single Molecule Inelastic Electron Tunneling Signals in Paraphenylene-Vinylene Oligomers and Distyrylbenzene[2.2]paracyclophanes'
Maddox, JB; Harbola, U; Liu, N; Silien, C; Ho, W; Bazan, GC; Mukamel, S (2006) 'Simulation of Single Molecule Inelastic Electron Tunneling Signals in Paraphenylene-Vinylene Oligomers and Distyrylbenzene[2.2]paracyclophanes'. JOURNAL OF PHYSICAL CHEMISTRY A, 110 :6329-6338 [Details]
2005 'Vibronic Spectroscopy of Single C60 Molecules and Monolayers with the STM'
Nilay A. Pradhan, Ning Liu, and Wilson Ho (2005) 'Vibronic Spectroscopy of Single C60 Molecules and Monolayers with the STM'. Journal Of Physical Chemistry B, 109 [Details]
2005 'Tuning the bipolar conductance of an alkali-doped C60 layer sandwiched between two tunneling barriers'
Pradhan, NA; Liu, N; Silien, C; Ho, W (2005) 'Tuning the bipolar conductance of an alkali-doped C60 layer sandwiched between two tunneling barriers'. NANO LETTERS, 5 :55-59 [Details]
2005 'Atomic scale conductance induced by single impurity charging'
Pradhan, NA; Liu, N; Silien, C; Ho, W (2005) 'Atomic scale conductance induced by single impurity charging'. PHYSICAL REVIEW LETTERS, 94 [Details]
2004 'Vibronic states in single molecules: C60 and C70 on ultrathin Al2O3 films'
Ning Liu, Nilay A. Pradhan and Wilson Ho (2004) 'Vibronic states in single molecules: C60 and C70 on ultrathin Al2O3 films'. Journal Of Chemical Physics, 120 [Details]

Conference Publications

  Year Publication
2017 Do Low-loss Doped Semiconductor Nanoparticles Yield Stronger Field Enhancement?
Khurgin, JB,Wu, PC,Tsai, DP,Liu, N,Hsieh, W,Sun, G, (2017) 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) Do Low-loss Doped Semiconductor Nanoparticles Yield Stronger Field Enhancement? [Details]
2017 2017 Conference on Lasers and Electro-Optics, CLEO 2017 - Proceedings
Khurgin J.;Wu P.;Tsai D.;Liu N.;Hsieh W.;Sun G. (2017) Do Low-loss doped semiconductor nanoparticles yield stronger field enhancement? 2017 Conference on Lasers and Electro-Optics, CLEO 2017 - Proceedings , pp.1-2 [DOI] [Details]
2017 Optics InfoBase Conference Papers
Khurgin J.;Wu P.;Tsai D.;Liu N.;Hsieh W.;Sun G. (2017) Do low-loss doped semiconductor nanoparticles yield stronger field enhancement? Optics InfoBase Conference Papers [DOI] [Details]
2017 Optics InfoBase Conference Papers
Corbett B.;Loi R.;Quinn D.;O'Callaghan J.;Liu N. (2017) Transferred III-V materials - novel devices and integration Optics InfoBase Conference Papers [DOI] [Details]
2013 Optics Express
Pita I.;Hendaoui N.;Liu N.;Kumbham M.;Tofail S.;Peremans A.;Silien C. (2013) High resolution imaging with differential infrared absorption micro-spectroscopy Optics Express , pp.25632-25642 [DOI] [Details]

Reviews

  Year Publication
2020 Characterisation and manipulation of polarisation response in plasmonic and magneto-plasmonic nanostructures and metamaterials.
Khan P.;Brennan G.;Lillis J.;Tofail S.A.;Liu N.;Silien C. (2020) Characterisation and manipulation of polarisation response in plasmonic and magneto-plasmonic nanostructures and metamaterials. Reviews [DOI] [Details]
2018 Plasmon Waveguiding in Nanowires.
Wei, H,Pan, D,Zhang, SP,Li, ZP,Li, Q,Liu, N,Wang, WH,Xu, HX (2018) Plasmon Waveguiding in Nanowires. Reviews [DOI] [Details]

Teaching Interests

-            Quantum Mechanics (PH4061)
-            Semiconductor I/Semiconductor Processing (PH4071/PH5098)
-            Mechanics/Heat/Electricity & Magnetism (PH4131)
-            Physics for Engineers 1 (PH4011)
-            Wave/Light/Modern Physics (PH4102)

Recent Postgraduates

  Graduation Student Name University Degree Thesis
2018 Isabel Pita University of Limerick PhD The formation and enhancement of heterostructures to optimize surface plasmon propagation in nano-optics devices

International Collaborators

  Name Organisation / Institute Country
Alberto Diaspro Istituto Italiano di Tecnologia - IIT Italy
Greg Sun University of Massachusetts Boston USA
Paolo Bianchini Istituto Italiano di Tecnologia - IIT Italy
Hongxing Xu Chinese Academy of Sciences China