Professor Roger Lewis

Effects of Ca substitution on quasiacoustic sliding modes in Sr14−xCaxCu24O41

• November 2019

Thermionic enhanced heat transfer in electronic devices based on 3D Dirac materials

• Journal of Applied Physics
• October 2019

A review of terahertz detectors

• Journal of Physics D Applied Physics
• August 2019

Superficial and Fundamental Correspondences in the Terahertz/IR (6–15 THz) Absorption S...

• The Journal of Physical Chemistry A
• August 2018

Electrical Versus Optical: Comparing Methods for Detecting Terahertz Radiation Using Ne...

• Journal of Infrared Millimeter and Terahertz Waves
• May 2018

Distinguishing Quinacridone Pigments via Terahertz Spectroscopy: Absorption Experiments...

• The Journal of Physical Chemistry A
• April 2017

Azimuthal dependence of the Garton-Tomkins orbit in crossed magnetic and electric fields

• August 2016

Semiconductor hydrogen analogue candidates for observation of quasi-Landau oscillations...

• physica status solidi (b)
• August 2015

Optical reflectance studies of highly specular anisotropic nanoporous (111) InP membrane

• Semiconductor Science and Technology
• March 2015

Laser-induced oxidation kinetics of bismuth surface microdroplets on GaAsBi studied in ...

• Optics Express
• December 2014

3D Printed Terahertz Diffraction Gratings And Lenses

• Journal of Infrared Millimeter and Terahertz Waves
• November 2014

In situ micro-Raman studies of laser-induced bismuth oxidation reveals metastability of...

• Optical Materials Express
• September 2014

3D printing of aspherical terahertz lenses and diffraction gratings

• September 2014

Absorption spectra of benzoic acid in the 5–15 THz range

• September 2014

Pump polarization dependence of optical rectification for 112A GaAs

• September 2014

THz absorption bands in Sr<inf>14</inf>Cu<inf>24</inf>O<inf>41</inf> by synchrotron rad...

• September 2014

Terahertz sources

• Journal of Physics D Applied Physics
• August 2014

THz photomixer with milled nanoelectrodes on LT-GaAs

• Applied Physics A
• August 2014

Complementary terahertz absorption and inelastic neutron study of the dynamic anisotrop...

• Physical Review B
• August 2014

Effect of heavy noble gas ion irradiation on terahertz emission efficiency of InP (100)...

• Semiconductor Science and Technology
• August 2014

Raman scattering reveals strong LO-phonon-hole-plasmon coupling in nominally undoped Ga...

• Optics Express
• May 2014

Closed-orbit dependence on the field direction in the anisotropic diamagnetic Kepler pr...

• Physical Review A
• April 2014

THz photomixer with a 40nm-wide nanoelectrode gap on low-temperature grown GaAs

• December 2013

Spherical, cylindrical and tetrahedral symmetries; hydrogenic states at high magnetic f...

• Scientific Reports
• December 2013

Raman scattering studies of strain effects in (100) and (311)B GaAs1−xBix epitaxial layers

• Journal of Applied Physics
• November 2013

Energy loss rate of a charged particle in HgTe/(HgTe, CdTe) quantum wells

• Applied Physics Letters
• November 2013

Dielectric properties of Bi doped Sb<inf>2</inf>Te<inf>3</inf> thin films studied by te...

• September 2013

High temperature anisotropy of NdFeO<inf>3</inf> determined using time-domain THz spect...

• September 2013

Optical characterization of novel terahertz emitters

• September 2013

Signature of aromatic carbons in the terahertz spectroscopy of bio-chars

• September 2013

Time-domain spectroscopy of novel nematic liquid crystals in the terahertz range

• September 2013

Parameters Controlling Emission of Terahertz Frequency Electromagnetic Radiation from I...

• ECS Transactions
• March 2013

Collective librations of water molecules in the crystal lattice of rubidium bromide: ex...

• Physical Chemistry Chemical Physics
• January 2013

Photomixing in topological insulator HgTe/CdTe quantum wells in terahertz regime

• Applied Physics Letters
• November 2012

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O2Cl

• Physical Review B
• November 2012

Terahertz surfoluminescence

• Surface Science
• November 2012

Optical parameters of ZnTe determined using continuous-wave terahertz radiation

• Journal of Applied Physics
• September 2012

Terahertz photon mixing effect in graphene and topological insulator

• September 2012

Complementary techniques for probing terahertz magnetic excitations in Cu<inf>3</inf>Bi...

• September 2012

Material characterization at low frequencies using THz and Raman spectroscopy

• September 2012

Nonlinear response of topological insulators in the terahertz regime

• September 2012

The importance of scattering, surface potential, and vanguard counter-potential in tera...

• Applied Physics Letters
• June 2012

Spatial dispersion in three-dimensional drawn magnetic metamaterials

• Optics Express
• May 2012

Probing and modelling the localized self-mixing in a GaN/AlGaN field-effect terahertz d...

• Applied Physics Letters
• April 2012

Role of vanguard counter-potential in terahertz emission due to surface currents explic...

• Physical Review B
• October 2011

Characterising Zinc Telluride wafers using continuous-wave terahertz spectroscopy

• October 2011

Geometrical factors in the emission of terahertz radiation from semiconductors under ex...

• October 2011

Stacked-and-drawn metamaterials with magnetic resonances in the terahertz range

• Optics Express
• August 2011

Direct-drawn metamaterial fibers with magnetic response in the 100GHz range

• August 2011

Optical rectification for terahertz generation

• physica status solidi (c)
• May 2011

Fiber metamaterials with negative magnetic permeability in the terahertz

• Optical Materials Express
• April 2011

LET’S TALK TERAHERTZ!

• American Journal of Physics
• April 2011

Bulk and surface field-induced optical rectification from(11N)zincblende crystals in a ...

• Physical Review B
• March 2011

Heavy noble gas (Kr, Xe) irradiated (111) InP nanoporous honeycomb membranes with enhan...

• Applied Physics Letters
• November 2010

Mechanisms of x-ray emission from peeling adhesive tape

• Applied Physics Letters
• September 2010

Characterization of semiconductor materials as terahertz emitters under the effect of i...

• September 2010

Comparison of expressions for terahertz generation for bulk optical rectification away ...

• September 2010

Detection of biochar components for soil fertility using THz-TDS

• September 2010

THz-TDS of filter paper at differing humidities

• September 2010

Extremely broadband characterization of a Schottky diode based THz detector

• September 2010

Reconciling expressions for terahertz generation by bulk optical rectification

• April 2010

Terahertz time-domain spectroscopy of nematic liquid crystals

• April 2010

Energy States of Phosphorous Donor in Silicon in Fields up to 18 T

• Journal of Low Temperature Physics
• January 2010

Terahertz emission from InP

• January 2010

Generation of terahertz radiation by bulk and surface optical rectification from crysta...

• Physical Review B
• November 2009

A terahertz system of units

• September 2009

THz generation by optical rectification involving high-index planes

• September 2009

Terahertz generation by optical rectification in GaAs and related materials

• August 2009

Peeling adhesive tape emits electromagnetic radiation at terahertz frequencies

• Optics Letters
• July 2009

Metastability in the resistance of polycrystalline La0.8Li0.2MnO3

• physica status solidi (RRL) - Rapid Research Letters
• July 2009

The role of optical rectification in the generation of terahertz radiation from GaBiAs

• Applied Physics Letters
• June 2009

Comparison of photoexcited p-InAs THz radiation source with conventional thermal radiat...

• Journal of Applied Physics
• March 2009

Small electroresistance (SER) in bulk La2/3Sr1/3MnO3 below

• Journal of Alloys and Compounds
• March 2009

New modes of THz generation by low-temperature-grown GaAsSb

• Solid-State Electronics
• February 2009

Efficiency in nanometre gap vacuum thermionic refrigerators

• Journal of Physics D Applied Physics
• January 2009

Terahertz Physics

• January 2009

Investigation of THz Emission by p-GaAsSb

• January 2009

Publisher’s Note: Investigation of p-GaAsSb as a THz Emitter [J. Electrochem. Soc., 155...

• Journal of The Electrochemical Society
• January 2009

Single-cycle azimuthal angle dependence of terahertz radiation from (100) n-type InP

• Applied Physics Letters
• December 2008

Time-domain THz spectroscopy using acceptor-doped GaAs photoconductive emitters

• Semiconductor Science and Technology
• September 2008

Emission of terahertz-frequency electromagnetic radiation from indium phosphide under e...

• September 2008

Never a dull moment

• American Journal of Physics
• July 2008

Electroresistance of La0.8Li0.2MnO3

• Applied Physics Letters
• May 2008

Subterahertz Josephson plasma emission in layered high-TC superconducting tunnel junctions

• Journal of Applied Physics
• April 2008

Terahertz Zeeman spectroscopy of boron in germanium to high magnetic fields

• Physical Review B
• March 2008

Electronic and thermal transport in hot carrier solar cells with low-dimensional contacts

• Microelectronics Journal
• March 2008

Thermionic refrigeration in low-dimensional structures

• Microelectronics Journal
• March 2008

Reflectance studies of candidate THz emitters

• Journal of Materials Science Materials in Electronics
• February 2008

Investigation of p-GaAsSb as a THz Emitter

• Journal of The Electrochemical Society
• January 2008

Semiconductor terahertz emitters

• December 2007

Physical Phenomena in Electronic Materials in the Terahertz Region

• Proceedings of the IEEE
• August 2007

Terahertz imaging: materials and methods

• Journal of Materials Science Materials in Electronics
• March 2007

Thermionic refrigerators with non-Richardson current

• Journal of Physics D Applied Physics
• February 2007

Low thermal conductivity short-period superlattice thermionic devices

• Journal of Physics D Applied Physics
• September 2006

THz Emission from Mercury Cadmium Telluride Films Grown on Cadmium Zinc Telluride Subst...

• September 2006

Magnetospectroscopy to 30T of donor states in InP

• Physica B Condensed Matter
• April 2006

THz generation in InAs

• Physica B Condensed Matter
• April 2006

Far Infrared Spectra of La1−xCaxMn0.9Li0.1O3

• Journal of Physics Conference Series
• January 2006

Power generation with nanowire resonant tunneling thermoelectrics

• January 2006

Conventional and total momentum filtered thermionic devices

• December 2005

The effect of barrier shape on thermionic refrigerator performance

• December 2005

Magnetopolaron interactions inn-type indium phosphide

• Physical Review B
• December 2005

Strong terahertz emission from (100) p-type InAs

• Journal of Applied Physics
• December 2005

Electronic efficiency in nanostructured thermionic and thermoelectric devices

• Physical Review B
• November 2005

Infrared-active phonons of perovskite HoMn/sub 1-x/Co/sub x/O/sub 3/ (x=0--0.8)

• IEEE Transactions on Magnetics
• October 2005

Solid-state thermionics and thermoelectrics in the ballistic transport regime

• Journal of Applied Physics
• July 2005

Magneto-optical far-infrared absorption spectroscopy of the hole states of indium phosp...

• Physical Review B
• March 2005

Principles of charge and heat transport in thermionic devices

• February 2005

The effect of the electron energy spectrum on electronic efficiency and power in thermi...

• January 2005

MAGNETOSPECTROSCOPY OF Zn-DOPED InP TO 30 T

• International Journal of Modern Physics B
• November 2004

Phonon spectra of cobaltite/manganites in strong magnetic fields

• Journal of Magnetism and Magnetic Materials
• May 2004

Zeeman spectroscopy of Be impurity in GaAs to

• Physica B Condensed Matter
• April 2004

High-field magnetotransport in a two-dimensional electron gas in quantizing magnetic fi...

• Journal of Physics Condensed Matter
• December 2003

Magnetospectroscopy of Be in GaAs

• June 2003

Zeeman spectroscopy of the Zn acceptor in InP

• Solid State Communications
• May 2003

Investigation into space charge effects in I–V characteristics of multi-layer semicondu...

• Physica E Low-dimensional Systems and Nanostructures
• April 2003

Far-infrared reflection and transmission of La1−xCaxMnO3

• Journal of Alloys and Compounds
• December 2002

EFFECT OF STRONG TERAHERTZ RADIATION ON MAGNETOCONDUCTIVITY IN TWO DIMENSIONS

• International Journal of Modern Physics B
• August 2002

FERROMAGNETIC RESONANCES IN POLYCRYSTALLINE La0.8Li0.2MnO3

• International Journal of Modern Physics B
• August 2002

Photoconductivity of Be-doped GaAs under intense terahertz radiation

• Solid State Communications
• April 2002

Electronic thermal transport and thermionic cooling in semiconductor multi-quantum-well...

• Computer Physics Communications
• December 2001

Numerical calculation of thermionic cooling efficiency in a double-barrier semiconducto...

• Physica E Low-dimensional Systems and Nanostructures
• October 2001

Phonon modes of A(Co1/2Mn1/2) O3 (A=La, Nd, Dy, Ho, Yb)

• Journal of Solid State Chemistry
• September 2001

Synthesis and magnetic properties of perovskite La1−xCaxMn0.9Li0.1O3

• Journal of Alloys and Compounds
• July 2001

Far-infrared spectroscopy of the zinc acceptor in indium phosphide

• Physica B Condensed Matter
• January 2001

• Journal of Superconductivity and Novel Magnetism
• January 2001

Infrared absorption of lanthanum manganites

• Physica C Superconductivity
• November 2000

Internal transitions of confined neutral magnetoexcitons inGaAs/AlxGa1−xAsquantum wells

• July 2000

Cyclotron resonance in undoped, top-gated heterostructures

• Semiconductor Science and Technology
• May 2000

Piezospectroscopy of thep3/2and Fano series of singly ionized zinc in germanium

• March 2000

Quantum point contact in a magnetic field: Far-infrared resonant heating observed in ph...

• Applied Physics Letters
• November 1999

Zeeman spectroscopy of the Be acceptor in GaAs to intermediate fields

• Solid State Communications
• August 1999

Central-cell corrections for Si and S in GaAs in a strong magnetic field

• Journal of Applied Physics
• January 1999

Far-infrared studies of extremely high mobility gated GaAs/AlGaAs structures in magneti...

• Physica B Condensed Matter
• December 1998

Magneto-photoconductivity of a 2DEG under intense terahertz radiation

• Physica B Condensed Matter
• December 1998

Magneto-plasmon spectrum in a semiconductor under intense laser radiation

• Physica B Condensed Matter
• December 1998

Magneto-Spectroscopy of Beryllium Impurity in Gallium Arsenide

• physica status solidi (b)
• December 1998

Far-infrared laser photoconductivity of n-GaAs multiple quantum wells in a pulsed magne...

• Physica B Condensed Matter
• May 1998

Spectroscopy and piezospectroscopy of the Lyman transitions and Fano resonances of indi...

• July 1996

Magneto-oscillations and field-induced phase transitions in organic conductors

• Surface Science
• July 1996

Energy states of Be in GaAs

• May 1996

Video introductions to laboratory: Students positive, grades unchanged

• American Journal of Physics
• May 1995

Piezospectroscopy of the and fano series of singly ionised Zn in Ge

• Solid State Communications
• February 1995

Cyclotron resonance measurements of the hole mass in [0 0 1] and [1 1 1] InxGa1−xSb/GaS...

• Physica B Condensed Matter
• February 1993

Cyclotron resonance of mixed phases of the 2-D system in the ultra-quantum limit

• Physica B Condensed Matter
• February 1993

Computer assignments and problems classes for physics students

• Computers & Education
• January 1991

Student scanning tunneling microscope

• American Journal of Physics
• January 1991

Fano resonances in the absorption spectrum of singly ionised zinc in germanium

• Solid State Communications
• September 1990

Electrical and Thermal Characteristics of Multilayer Thermionic Power Devices

Terahertz Absorption by Magnetoplasma Sound Wave Excitation in Semiconductor Heterostru...

The Electron Energy Spectrum and Thermionic Device Efficiency

Thermionic cooling of optoelectronic and microelectronic devices

Far-infrared measurements of cyclotron resonance and impurity transitions in bulk n-GaA...