Items where authors include "Freeman, JR"

Article

Knox, CS orcid.org/0000-0002-4673-5649, Vaughan, MT orcid.org/0000-0002-8336-2183, Burnett, AD orcid.org/0000-0003-2175-1893 et al. (5 more authors) (2022) Effects of structural ordering on infrared active vibrations within Bi₂(Te₍₁—ₓ₎Seₓ)₃. Physical Review B, 106 (24). 245203. ISSN 2469-9950

Beckert, A, Grimm, M, Hermans, RI et al. (8 more authors) (2022) Precise determination of the low-energy electronuclear Hamiltonian of LiY1−x HoxF4. Physical Review B, 106 (11). 115119. ISSN 2469-9950

Riepl, J, Raab, J, Abajyan, P et al. (11 more authors) (2021) Field-resolved high-order sub-cycle nonlinearities in a terahertz semiconductor laser. Light: Science and Applications, 10. 246. ISSN 2047-7538

Chudpooti, N, Duangrit, N, Burnett, AD orcid.org/0000-0003-2175-1893 et al. (8 more authors) (2021) Wideband Dielectric Properties of Silicon and Glass Substrates for Terahertz Integrated Circuits and Microsystems. Materials Research Express, 8 (5). 056201. ISSN 2053-1591

Goulain, P, Koulouklidis, AD, Manceau, J-M et al. (9 more authors) (2021) Femtosecond Broadband Frequency Switch of Terahertz Three-Dimensional Meta-Atoms. ACS Photonics, 8 (4). pp. 1097-1102. ISSN 2330-4022

Mohandas, RA, Ponnampalam, L, Li, L orcid.org/0000-0003-4998-7259 et al. (5 more authors) (2020) Exact frequency and phase control of a terahertz laser. Optica, 7 (9). pp. 1143-1149. ISSN 2334-2536

Kundu, I orcid.org/0000-0002-3564-1903, Bacon, DR orcid.org/0000-0001-8385-0614, Dean, P orcid.org/0000-0002-3950-4359 et al. (4 more authors) (2020) Programmable, Transform-Limited Pulses from a Terahertz Quantum Cascade Laser. ACS Photonics, 7 (9). pp. 2423-2428. ISSN 2330-4022

Bacon, DR orcid.org/0000-0001-8385-0614, Gill, TB orcid.org/0000-0002-1191-6466, Rosamond, M et al. (7 more authors) (2020) Photoconductive Arrays on Insulating Substrates for High-Field Terahertz Generation. Optics Express, 28 (12). pp. 17219-17231. ISSN 1094-4087

Kundu, I orcid.org/0000-0002-3564-1903, Freeman, JR orcid.org/0000-0002-5493-6352, Dean, P orcid.org/0000-0002-3950-4359 et al. (3 more authors) (2020) Wideband Electrically Controlled Vernier Frequency Tunable Terahertz Quantum Cascade Laser. ACS Photonics, 7 (3). pp. 765-773. ISSN 2330-4022

Kundu, I orcid.org/0000-0002-3564-1903, Freeman, JR orcid.org/0000-0002-5493-6352, Dean, P orcid.org/0000-0002-3950-4359 et al. (3 more authors) (2020) Terahertz photonic integrated circuit for frequency tuning and power modulation. Optics Express, 28 (4). pp. 4374-4386. ISSN 1094-4087

Meng, K, Park, SJ orcid.org/0000-0001-8606-191X, Burnett, AD et al. (12 more authors) (2019) Increasing the sensitivity of terahertz split ring resonator metamaterials for dielectric sensing by localized substrate etching. Optics Express, 27 (16). pp. 23164-23172. ISSN 1094-4087

Garufo, A, Sberna, PM, Carluccio, G et al. (9 more authors) (2019) A Connected Array of Coherent Photoconductive Pulsed Sources to Generate mW Average Power in the Submillimeter Wavelength Band. IEEE Transactions on Terahertz Science and Technology, 9 (3). pp. 221-236. ISSN 2156-342X

Kundu, I orcid.org/0000-0002-3564-1903, Wang, F, Qi, X et al. (16 more authors) (2018) Author Correction: Ultrafast switch-on dynamics of frequency-tuneable semiconductor lasers. Nature Communications, 9 (1). 5181. ISSN 2041-1723

Kundu, I orcid.org/0000-0002-3564-1903, Dean, P orcid.org/0000-0002-3950-4359, Valavanis, A orcid.org/0000-0001-5565-0463 et al. (6 more authors) (2018) Continuous frequency tuning with near constant output power in coupled Y-branched terahertz quantum cascade lasers with photonic lattice. ACS Photonics, 5 (7). pp. 2912-2920. ISSN 2330-4022

Garufo, A, Carluccio, G, Freeman, JR orcid.org/0000-0002-5493-6352 et al. (5 more authors) (2018) Norton Equivalent Circuit for Pulsed Photoconductive Antennas - Part II: Experimental Validation. IEEE Transactions on Antennas and Propagation, 66 (4). pp. 1646-1659. ISSN 0018-926X

Han, Y orcid.org/0000-0003-2141-3077, Li, LH orcid.org/0000-0003-4998-7259, Zhu, J et al. (7 more authors) (2018) Silver-based surface plasmon waveguide for terahertz quantum cascade lasers. Optics Express, 26 (4). pp. 3815-3827. ISSN 1094-4087

Freeman, JR orcid.org/0000-0002-5493-6352, Ponnampalam, L, Shams, H et al. (7 more authors) (2017) Injection locking of a terahertz quantum cascade laser to a telecommunications wavelength frequency comb. Optica, 4 (9). pp. 1059-1064.

Keeley, JT orcid.org/0000-0001-5251-6648, Freeman, JR orcid.org/0000-0002-5493-6352, Bertling, K orcid.org/0000-0003-1087-2315 et al. (9 more authors) (2017) Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry. Scientific Reports, 7. 7236. ISSN 2045-2322

Mohandas, RA orcid.org/0000-0001-8110-7034, Freeman, JR orcid.org/0000-0002-5493-6352, Natrella, M orcid.org/0000-0002-3742-147X et al. (10 more authors) (2017) Terahertz generation mechanism in nano-grating electrode photomixers on Fe-doped InGaAsP. Optics Express, 25 (9). pp. 10177-10188. ISSN 1094-4087

Han, YJ orcid.org/0000-0003-2141-3077, Li, LH orcid.org/0000-0003-4998-7259, Grier, A et al. (9 more authors) (2016) Extraction-controlled terahertz frequency quantum cascade lasers with a diagonal LO-phonon extraction and injection stage. Optics Express, 24 (25). pp. 28583-28593. ISSN 1094-4087

Bacon, DR orcid.org/0000-0001-8385-0614, Burnett, AD orcid.org/0000-0003-2175-1893, Swithenbank, M orcid.org/0000-0002-6146-1818 et al. (8 more authors) (2016) Free-space terahertz radiation from a LT-GaAs-on-quartz large-area photoconductive emitter. Optics Express, 24 (23). pp. 26986-26997. ISSN 1094-4087

Hatem, O, Freeman, JR, Cunningham, JE et al. (5 more authors) (2016) Generation of Terahertz Radiation from Fe-doped InGaAsP Using 800 nm to 1550 nm Pulsed Laser Excitation. Journal of Infrared, Millimeter and Terahertz Waves, 37 (5). pp. 415-425. ISSN 1866-6892

Mohandas, RA, Freeman, JR, Rosamond, MC et al. (12 more authors) (2016) Generation of continuous wave terahertz frequency radiation from metal-organic chemical vapour deposition grown Fe-doped InGaAs and InGaAsP. Journal of Applied Physics, 119 (15). 153103. ISSN 1089-7550

Bacon, DR, Freeman, JR, Mohandas, RA et al. (4 more authors) (2016) Gain recovery time in a terahertz quantum cascade laser. Applied Physics Letters, 108 (8). 081104. ISSN 0003-6951

Mueckstein, R, Natrella, M, Hatem, O et al. (10 more authors) (2015) Near-field analysis of terahertz pulse generation from photo-excited charge density gradients. IEEE Transactions on Terahertz Science and Technology, 5 (2). 260 - 267. ISSN 2156-342X

Brewer, A, Freeman, JR, Cavalie, P et al. (5 more authors) (2014) Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics. Applied Physics Letters, 104 (8). ARTN 081107. ISSN 0003-6951

Freeman, JR, Maysonnave, J, Beere, HE et al. (3 more authors) (2013) Electric field sampling of modelocked pulses from a quantum cascade laser. Optics Express, 21 (13). 13. 16162 - 16169. ISSN 1094-4087

Freeman, JR, Maysonnave, J, Khanna, S et al. (4 more authors) (2013) Laser-seeding dynamics with few-cycle pulses: Maxwell-Bloch finite-difference time-domain simulations of terahertz quantum cascade lasers. Physical Review A - Atomic, Molecular, and Optical Physics, 87 (6). 063817. ISSN 1050-2947

Conference or Workshop Item

Dunn, A orcid.org/0000-0002-7369-1469, Bacon, DR, Gill, TB et al. (6 more authors) (2020) Development of a Broadband Multidimensional THz Spectrometer. In: IRMMW-THZ 2020, 08-13 Nov 2020, Online/ Buffalo, NY, USA.

Freeman, JR orcid.org/0000-0002-5493-6352, Ponnampalam, L, Shams, H et al. (7 more authors) (2018) Quasi-optical injection locking of a terahertz quantum cascade laser to a fiber-based frequency comb. In: IQCLSW 2018, 02-07 Sep 2018, Cassis, France. (Unpublished)

Kundu, I orcid.org/0000-0002-3564-1903, Wang, F, Qi, X et al. (16 more authors) (2018) Dependence of switch-on time on Vernier comb alignment in frequency tunable lasers. In: 8th International Quantum Cascade Laser School and Workshop 2018, 02-07 Sep 2018, Cassis, France. (Unpublished)

Kundu, I orcid.org/0000-0002-3564-1903, Dean, P, Valavanis, A orcid.org/0000-0001-5565-0463 et al. (6 more authors) (2018) Continuous frequency tuning with near constant output power in coupled Y-branched terahertz quantum cascade lasers with photonic lattice. In: 8th International Quantum Cascade Laser School and Workshop 2018, 02-07 Sep 2018, Cassis, France. (Unpublished)

Chowdhury, S, Freeman, JR, Rosamond, MC et al. (6 more authors) (2015) Study of the effect of annealing temperature on low-temperature-grown-GaAs photomixers. In: UK Semiconductors 2015, 01-02 Jul 2015, Sheffield, UK.

Mueckstein, R, Natrella, M, Hatem, O et al. (10 more authors) (2015) THz pulse generation by charge density gradients investigated by near-field microscopy. In: Optical Terahertz Science & Technology Conference, 08-13 Mar 2015, San Diego, CA.

Han, YJ, Grier, A, Valavanis, A orcid.org/0000-0001-5565-0463 et al. (7 more authors) Modelling of three-well extraction-controlled terahertz frequency quantum cascade lasers using an extended density matrix approach. In: International Quantum Cascade Lasers School and Workshop, 04-09 Sep 2016, Cambridge, UK.

Hussein, M, Zhou, J, Huang, Y et al. (8 more authors) Second-Order Terahertz Bandpass Frequency Selective Surface with Stable Angular Responses. In: IET Colloquium on Millimetre-wave and Terahertz Engineering & Technology 2017, 30 Mar 2017, Glasgow, UK. (Unpublished)

Han, YJ, Li, LH, Chen, L et al. (9 more authors) Three-well terahertz frequency quantum cascade lasers with a common LO-phonon extraction and injection stage. In: Intersubband Transitions in Quantum Wells (ITQW) 2015, 06-11 Sep 2015, Vienna. (Unpublished)

Proceedings Paper

Kidd, C, Rosamond, MC, Chen, L et al. (5 more authors) (2022) Improving the Efficiency of LT-GaAs Photoconductive Arrays on Optically Transparent Substrates for High Field THz Generation. In: 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 28 Aug - 02 Sep 2022, Delft, The Netherlands. IEEE .

Riepl, J, Raab, J, Abajyan, P et al. (11 more authors) (2022) Sub-cycle high-order nonlinearities in a terahertz quantum cascade laser. In: 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 28 Aug - 02 Sep 2022, Delft, Netherlands. IEEE , pp. 1-2. ISBN 978-1-7281-9428-8

Gill, TB orcid.org/0000-0002-1191-6466, Kidd, C, Dean, P et al. (8 more authors) (2022) Ultrafast Two-Dimensional Time-Domain Spectroscopy of Hydrogen-Like Impurity Centers in Germanium. In: Proceedings of the 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 28 Aug - 02 Jun 2022, Delft, The Netherlands. IEEE . ISBN 978-1-7281-9428-8

Riepl, J, Raab, J, Abajyan, P et al. (11 more authors) (2022) Field-resolved high-order nonlinearities in a free-running terahertz quantum cascade laser. In: Proceedings of the 2022 Conference on Lasers and Electro-Optics, CLEO 2022 - Proceedings. 2022 Conference on Lasers and Electro-Optics (CLEO), 15-20 May 2022, San Jose, CA, USA. IEEE , pp. 1-2. ISBN 9781957171050

Riepl, J, Raab, J, Abajyan, P et al. (11 more authors) (2022) Field-resolved high-order nonlinearities in a free-running terahertz quantum cascade laser. In: Conference on Lasers and Electro-Optics, Technical Digest Series. CLEO: 2022, 15-20 May 2022, San Jose, California, United States. Optica Publishing Group . ISBN 978-1-957171-05-0

Gill, TB orcid.org/0000-0002-1191-6466, Bacon, DR, Dean, P orcid.org/0000-0002-3950-4359 et al. (5 more authors) (2021) Broadband Nonlinear Spectroscopy of Hydrogen-Like Levels in Ge:As. In: 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 08-13 Nov 2020, Buffalo, NY, USA. IEEE .

Park, SJ orcid.org/0000-0001-8606-191X, Meng, K, Burnett, AD et al. (12 more authors) (2020) Increasing the sensitivity of terahertz metamaterials for dielectric sensing by substrate etching. In: 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). 2020 45th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 08-13 Nov 2020, Buffalo, NY, USA. IEEE . ISBN 978-1-7281-6621-6

Garufo, A, Sberna, P, Carluccio, G et al. (10 more authors) (2019) Pulsed Photoconductive Connected Slot Array Operating at the Sub-mm Wavelength Band. In: 2019 49th European Microwave Conference (EuMC). 2019 49th European Microwave Conference (EuMC), 30 Sep - 01 Oct 2019, Paris, France. IEEE , pp. 820-823. ISBN 9782874870552

Ponnampalam, L, Fice, MJ, Renaud, C et al. (5 more authors) (2019) Continuously Tunable Coherent THz Synthesizer, Referenced to Primary Frequency Standards. In: 2019 IEEE International Topical Meeting on Microwave Photonics, MWP 2019. 2019 International Topical Meeting on Microwave Photonics, MWP 2019, 07-10 Oct 2019, Ottawa, ON, Canada. IEEE . ISBN 9781728136257

Mohandas, RA, Ponnampalam, L, Seeds, A et al. (4 more authors) (2019) High-resolution frequency and phase control of a terahertz laser. In: 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). 44th International Conference on Infrared, Millimeter, and Terahertz Waves, 01-06 Sep 2019, Paris, France. IEEE . ISBN 9781538682852

Bacon, DR, Rosamond, M, Gill, T orcid.org/0000-0002-1191-6466 et al. (7 more authors) (2019) Photoconductive Arrays for High-Field Terahertz Generation. In: 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). 44th International Conference on Infrared, Millimeter, and Terahertz Waves, 01-06 Sep 2019, Paris, France. IEEE .

Garufo, A, Sberna, P, Carluccio, G et al. (10 more authors) (2019) Pulsed Photoconductive Connected Slot Array Operating at the Sub-mm Wavelength Band. In: Proceedings of the 14th European Microwave Integrated Circuits Conference. 14th European Microwave Integrated Circuits Conference, 30 Sep - 01 Oct 2019, Paris, France. , pp. 266-269. ISBN 978-2-87487-056-9

Kundu, I orcid.org/0000-0002-3564-1903, Wang, F, Qi, X et al. (16 more authors) (2019) WC2.3 - Probing Ultrafast Switch-on Dynamics of Frequency Tuneable Semiconductor Lasers Using Terahertz Time-domain Spectroscopy (Invited). In: Proceedings of the 2019 IEEE Photonics Society Summer Topical Meeting Series (SUM). 2019 IEEE Photonics Society Summer Topical Meeting Series (SUM), 08-10 Jul 2019, Ft. Lauderdale, FL, USA. IEEE . ISBN 978-1-7281-0597-0

Garufo, A, Sberna, P, Carluccio, G et al. (6 more authors) (2018) Leaky Lens Antenna as Optically Pumped Pulsed THz Emitter. In: 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IRMMW-THz 2018, 09-14 Sep 2018, Nagoya, Japan. IEEE . ISBN 978-1-5386-3809-5

Kundu, I orcid.org/0000-0002-3564-1903, Dean, P, Valavanis, A orcid.org/0000-0001-5565-0463 et al. (6 more authors) (2018) Continuous frequency tuning of Y-branched terahertz quantum cascade lasers with photonic lattice. In: Conference on Lasers and Electro-Optics, OSA Technical Digest (online). CLEO:2018, 13-18 May 2018, San Jose, CA, USA. Optical Society of America . ISBN 978-1-943580-42-2

Garufo, A, Carluccio, G, Freeman, JR orcid.org/0000-0002-5493-6352 et al. (5 more authors) (2017) Characterization of the THz quasi-optical channel for the measurement of the power radiated by photoconductive antennas. In: 42nd International Conference on Infrared, Millimeter, and Terahertz Waves. IRMMW-THz 2017, 27 Aug - 01 Sep 2017, Cancun, Mexico. IEEE . ISBN 978-1-5090-6050-4

Bacon, DR, Burnett, AD, Swithenbank, M et al. (8 more authors) (2017) Investigation into free-space terahertz radiation from a LT-GaAs-on-quartz photoconductive emitter. In: International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz. IRMMW-THz 2017, 27 Aug - 01 Sep 2017, Cancun, Mexico. IEEE . ISBN 978-1-5090-6050-4

Bacon, DR, Freeman, JR, Mohandas, RA et al. (4 more authors) (2016) Pump-probe measurements of gain in a terahertz quantum cascade laser. In: 2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz) 2016, 25-30 Sep 2016, Copenhagen, Denmark. IEEE . ISBN 9781467384858

Nong, H, Wang, F, Maussang, K et al. (10 more authors) (2016) Short pulse generation and dispersion in THz quantum cascade lasers. In: 2016 41st International Conference on Infrared, Millimeter, and Terahertz waves. 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz 2016), 25-30 Sep 2016, Copenhagen, Denmark. IEEE . ISBN 9781467384858

Mohandas, RA, Freeman, JR, Rosamond, MC et al. (8 more authors) (2016) Terahertz emission mechanism and laser excitation position dependence of nano-grating electrode photomixers. In: 2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 25-30 Sep 2016, Copenhagen, Denmark. IEEE . ISBN 9781467384858

Nong, H, Wang, FH, Maussang, K et al. (10 more authors) (2016) Short pulse generation from active mode-locked THz quantum cascade lasers. In: UNSPECIFIED International Quantum Cascade Lasers School and Workshop, 04-09 Sep 2016, Cambridge, UK. .

Kundu, I, Wang, F, Qi, X et al. (12 more authors) (2016) Time-resolved analysis of Vernier selection dynamics in coupled-cavity terahertz quantum-cascade lasers. In: UNSPECIFIED International Quantum Cascade Lasers School and Workshop, 04-09 Sep 2016, Cambridge, UK. .

Wang, F, Maussang, K, Moumdji, S et al. (9 more authors) (2016) Terahertz pulse generation from quantum cascade lasers. In: 2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 23-28 Aug 2015, Hong Kong. IEEE . ISBN 9781479982738

Wang, F, Maussang, K, Moumdji, S et al. (9 more authors) (2015) Terahertz pulse generation from quantum cascade lasers. In: 2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). International Conference on Intersubband Transitions in Quantum Wells (ITQW), 06-11 Sep 2015, Vienna, Austria. IEEE . ISBN 978-1-4799-8272-1

Mohandas, RA orcid.org/0000-0001-8110-7034, Freeman, JR orcid.org/0000-0002-5493-6352, Rosamond, MC et al. (10 more authors) (2015) Generation of continuous wave terahertz radiation from Fe-doped InGaAs and InGaAsP. In: IEEE 2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). 40th International Conference on Infrared, Millimeter, and Terahertz Waves, 23-28 Aug 2015, Hong Kong. IEEE .

Maussang, K, Wang, F, Brewer, A et al. (11 more authors) (2014) Injection seeding of metal-metal terahertz quantum cascade lasers. In: International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz. International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz, 14-19 Sep 2014, Tucson, AZ, USA. IEEE Computer Society . ISBN 9781479938773

Mueckstein, R, Hatem, O, Natrella, M et al. (10 more authors) (2014) Mapping the distribution of photo-currents responsible for generation of terahertz pulses at semiconductor surfaces. In: International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz. 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 14-19 Sep 2014, Tucson, AZ, USA. IEEE Computer Society . ISBN 9781479938773

Valavanis, A, Dean, P, Li, LH et al. (16 more authors) (2014) High-power (> 1 Watt) terahertz frequency quantum cascade lasers for stand-off imaging. In: SET-210 Specialist Meeting on Novel infrared laser technology for modern battlefield requirements. SET-210 Specialist Meeting on Novel infrared laser technology for modern battlefield requirements, 24-25 Jul 2014, Salisbury, UK. NATO .

Han, YJ, Li, LH, Zhu, JX et al. (5 more authors) Silver-based surface plasmon waveguide for terahertz quantum cascade lasers. In: UNSPECIFIED IQCLSW2014 International Quantum Cascade Lasers School and Workshop, 07-12 Sep 2014, Policoro, Italy. . (Unpublished)

Li, LH, Chen, L, Zhu, JX et al. (5 more authors) THz quantum cascade lasers with output power over 1 W. In: UNSPECIFIED IQCLSW2014 International Quantum Cascade Lasers School and Workshop, 07-12 Sep 2014, Policoro, Italy. . (Unpublished)