Nonequilibrium Many Body Theory of Transport and Optics in Semiconductors; Nonlinear Optics; GHz-THz-Mid Infrared generation, detection and applications
162
Scopus Publications
2366
Scholar Citations
36
Scholar h-index
53
Scholar i10-index
Scopus Publications
First principles study of the OH radical: BΣ+2−XΠ2 and DΣ−2−XΠ2 rovibronic transitions Rania Al Abdallah, Nariman Abu Elkher, Mubarak Almehairbi, Salman Mahmoud, Anton M. Fernando, et al. Physical Review Research, 2026 OH radical can be found in comets, stellar atmospheres, planetary atmospheres, interstellar clouds, exoplanets, the solar photosphere, and sunspots, making it a significant astrophysical molecule. Its detection relies on its emission properties, intrinsic to the molecules’ rovibrational levels. This work presents high-level calculations of the electronic structure of OH radical using complete active space self consistent field/multiReference configuration interaction calculations, including Davidson correction methods with large basis sets and extensive treatment of the electron correlation. The adiabatic potential energy curves of the low-lying doublet and quartet electronic states of the hydroxyl, in the representation 2 S + 1 Λ ( + / − ) , are investigated. Additionally, a systematic investigation of the transition dipole moment function (TDMF) for the B Σ + 2 − X Π 2 and D Σ − 2 − X Π 2 transitions has been done along with the Franck-Condon factors of these systems. The computed TDMF and potential energy function are used in Le Roy's LEVEL and Western's PGOPHER programs, in combination with experimental literature line positions, to calculate rovibronic B Σ + 2 − X Π 2 and D Σ − 2 − X Π 2 transitions. The corresponding “first principles”-based line lists include line intensities, line positions with the relevant quantum numbers of the upper and lower states, e/f parity, and Einstein A coefficients. The results show good agreement with previously published experimental and theoretical data, including a corresponding updated MARVEL (measured active rotational-vibrational energy levels) analysis of the lowest excited states of the OH molecule.
Recent Progress in Light Polarization Control Schemes for Silicon Integrated Photonics Humaira Zafar, Mauro F. Pereira Laser and Photonics Reviews, 2024 Light polarization control is a target in photonics, and this paper provides a comprehensive review of research from various groups on the silicon‐on‐insulator (SOI) platform. It draws comparisons between devices such as polarization splitters (PS), polarizers, and polarization splitters/rotators (PSR). These devices are fabricated using various technologies, including silicon nanowires, ridge waveguides, hybrid plasmonic waveguides, and subwavelength grating (SWG) waveguides. A detailed review of polarizers used as cleanup filters in splitters is initiated. Subsequently, various polarization splitters utilizing asymmetric directional couplers (ADCs), which typically exhibiting low extinction ratios (ERs), are delved. To enhance ERs, a detailed comparison of methods outlined in the literature is provided. One notable method includes integrating on‐chip polarizers at both ports to eliminate unwanted light fractions and achieve exceptionally high ERs. Furthermore, SWG‐based polarizers and splitters commonly face issues with Bragg reflections that can affect other photonic devices and lasers and ways to minimize unwanted polarization back reflections in SWG‐designed polarization control devices are examined. Finally, emerging applications in mid‐infrared (MIR) sensing are explored, highlighting the necessity of polarization rotators for on‐chip transverse electric (TE) operation, since quantum cascade lasers, the primary sources in this range, emitting radiation in the (TM) mode.
Photoacoustic Spectroscopy Using a Quantum Cascade Laser for Analysis of Ammonia in Water Solutions Apostolos Apostolakis, Guillaume Aoust, Grégory Maisons, Ludovic Laurent, Mauro Fernandes Pereira ACS Omega, 2024 Ammonia (NH3) toxicity, stemming from nitrification, can adversely affect aquatic life and influence the taste and odor of drinking water. This underscores the necessity for highly responsive and accurate sensors to continuously monitor NH3 levels in water, especially in complex environments, where reliable sensors have been lacking until this point. Herein, we detail the development of a sensor comprising a compact and selective analyzer with low gas consumption and a timely response based on photoacoustic spectroscopy. This, combined with an automated liquid sampling system, enables the precise detection of ammonia traces in water. The sensor system incorporates a state-of-the art quantum cascade laser as the excitation source emitting at 9 μm in resonance with the absorption line of NH3 located at 1103.46 cm–1. Our instrument demonstrated detection sensitivity at a low ppm level for the ammonia molecule with response times of less than 60 s. For the sampling system, an ammonia stripping solution was designed, resulting in a prompt full measurement cycle (6.35 min). A further evaluation of the sensor within a pilot study showed good reliability and agreement with the reference method for real water samples, confirming the potential of our NH3 analyzer for water quality monitoring applications.
Controlling Vertical Asymmetry of Nanocrystals Through Anisotropic Etching-Assisted Nanosphere Lithography Arnab Ganguly, Humaira Zafar, Calvyn Travis Howells, Mauro Fernandes Pereira, Gobind Das Small Structures, 2024 Nanosphere lithography, a low‐cost fabrication technique, depends on the self‐assembly of nanoscale features to create nanostructures in a hexagonally close‐packed structure. In this article, the fabrication of 3D nanostructures over a large surface‐area with anisotropy along the growth direction through the combination of chemical and physical plasma etching is reported. The anisotropy stems from etching the nanosphere mask and the substrate at different rates. Due to the dynamic masking effect, a systematic variation of etching time gives rise to intriguing nanostructures with sharp edges that have strong potential for plasmonic applications, with the possibility of manipulating electromagnetic radiation. The structures obtained include nanocylinders, truncated hexagon‐based pyramids, circular pads on a conical base, and nanocones from a single‐layer nanosphere mask. Simulations of the fabrication process offer further insight into the understanding of nanostructure formation. A good agreement between predicted results and experiments confirms the potential of our numerical design. In addition, the optical properties of the nanostructures are investigated by UV–vis and the experimental findings are consistent with simulations based on a finite‐difference time‐domain method. The nanostructures described in this study contribute to the emerging 3D plasmonics and 3D magnonics, with strong potential for a significant impact on biosensor applications.
Magnetic field controlled nucleation and size selection of silver nanoparticles Y Tawalbeh, MF Pereira Applied Physics B 3, 42 , 2026 2026
Efficient and compact mid-infrared polarization splitter and rotator based on a bifurcated tapered-bent waveguid M Fernandes Pereira, H Zafar US Patent App. US20260043964A1 , 2026 2026
First principles study of the OH radical: B2 + −X2 and D2− −X2 rovibronic transitions RA Abdallah, NA Elkher, M Almehairbi, S Mahmoud, AM Fernando, ... PHYSICAL REVIEW RESEARCH 8, 013069 , 2026 2026
Complementary and asymmetric tapered bent mid-infrared waveguide arrays for subwavelength-pitch integration and crosstalk minimization H Zafar, MF Pereira Scientific Reports 15 (1), 44122 , 2025 2025 Citations: 2
Controlling the size of nanoparticles using a magnetic field: a sphere packing approach Y Tawalbeh, M Ghazi, MF Pereira Scientific Reports , 2025 2025 Citations: 1
TERA-MIR Photonic Functionalities and Applications MF Pereira, H Zafar, A Al-Ateqi, A Apostolakis, V Vaks PHOTONICA 2025, 98 , 2025 2025
Amplifying Two-Mode Squeezing in Nanomechanical Resonators MPBT M. A. Wodedo, T. G. Tesfahannes, T. Y. Darge IEEE Transactions on Quantum Engineering 6 (doi: 10.1109/TQE.2025.3603459 … , 2025 2025 Citations: 8
THz and Mid Infrared Photonics with Applications to Environmental Detection and Metabolomics VV M. F. Pereira, H. Zafar, A. Al-Ateqi, A. Apostolakis IEEE Explore, 1-4 , 2025 2025
An efficient and compact mid-infrared polarization splitter and rotator based on a bifurcated tapered-bent waveguide H Zafar, MF Pereira Sci Rep 15 (doi.org/10.1038/s41598-025-89420-3), 5160 , 2025 2025 Citations: 23
Photoacoustic Spectroscopy Using a Quantum Cascade Laser for Analysis of Ammonia in Water Solutions A Apostolakis, G Aoust, G Maisons, L Laurent, MF Pereira ACS Omega , 2024 2024 Citations: 15
A novel mid-infrared transverse magnetic mode pass periodic waveguide polarizer with low reflections H Zafar, MF Pereira IEEE Access 12, 48294-48300 , 2024 2024 Citations: 13
Recent Progress in Light Polarization Control Schemes for Silicon Integrated Photonics H Zafar, MF Pereira Laser Photonics Rev, 2301025-1 -2301025-29 , 2024 2024 Citations: 47
Controlling Vertical Asymmetry of Nanocrystals Through Anisotropic Etching-Assisted Nanosphere Lithography A Ganguly, H Zafar, CT Howells, G Pereira, M.F. and Das Small Structures, 2300300 , 2023 2023 Citations: 7
Progress in analytical solutions for high order harmonic generation in semiconductor superlattice multipliers A 1. Al-Ateqi, MF Pereira Opt Quant Electron 55 (1287) , 2023 2023 Citations: 1
O-band TE- and TM-mode densely packed adiabatically bent waveguide arrays on the silicon-on-insulator platform H Zafar, B Paredes, J Villegas, M Rasras, MF Pereira Opt. Express 31, 21389-21398 , 2023 2023 Citations: 19
Compact and broadband adiabatically bent superlattice-waveguides with negligible insertion loss and ultra-low crosstalk H Zafar, B Paredes, I Taha, JE Villegas, M Rasras, MF Pereira IEEE Journal of Selected Topics in Quantum Electronics , 2023 2023 Citations: 16
Improving Water Quality and Security P Cousin, A Moumtzidou, A Karakostas, L Gounaridis, C Kouloumentas, ... Instrumentation and Measurement Technologies for Water Cycle Management, 251 , 2022 2022
Improving water quality and security with advanced sensors and indirect water sensing methods P Cousin, A Moumtzidou, A Karakostas, L Gounaridis, C Kouloumentas, ... Instrumentation and Measurement Technologies for Water Cycle Management, 251-277 , 2022 2022 Citations: 7
A Robust Nonlinear Model of Steam Reformers with Applications to Energy Efficiency R de S.Teixeira, MF Pereira, JP Zubelli Chemical Engineering Research and Design , 2022 2022
Sensing nitriles with THz spectroscopy of urine vapours from cancers patients subject to chemotherapy V Vaks, V Anfertev, M Chernyaeva, E Domracheva, A Yablokov, ... Sci Rep 12 (doi.org/10.1038/s41598-022-22783-z), 18117 (2022) , 2022 2022 Citations: 34
MOST CITED SCHOLAR PUBLICATIONS
Nonequilibrium many body theory for quantum transport in terahertz quantum cascade lasers T Schmielau, MF Pereira Applied Physics Letters 95 (23) , 2009 2009 Citations: 132
Microscopic theory for the influence of Coulomb correlations in the light-emission properties of semiconductor quantum wells MF Pereira Jr, K Henneberger Physical Review B 58 (4), 2064 , 1998 1998 Citations: 112
Controlling many-body effects in the midinfrared gain and terahertz absorption of quantum cascade laser structures MF Pereira Jr, SC Lee, A Wacker Physical review B 69 (20), 205310 , 2004 2004 Citations: 82
Theory and measurements of harmonic generation in semiconductor superlattices with applications in the 100 GHz to 1 THz range M Pereira, JP Zubelli, D Winge, A Wacker, AS Rodrigues, V Anfertev, ... Physical Review B (PRB) 96 (4), 045306 , 2017 2017 Citations: 63
Interplay of Coulomb and nonparabolicity effects in the intersubband absorption of electrons and holes in quantum wells MF Pereira Jr, H Wenzel Physical Review B—Condensed Matter and Materials Physics 70 (20), 205331 , 2004 2004 Citations: 55
Intervalence transverse-electric mode terahertz lasing without population inversion MF Pereira Jr Physical Review B—Condensed Matter and Materials Physics 78 (24), 245305 , 2008 2008 Citations: 54
Exciton binding energies in semiconductor superlattices: An anisotropic-effective-medium approach MF Pereira Jr, I Galbraith, SW Koch, G Duggan Physical Review B 42 (11), 7084 , 1990 1990 Citations: 54
Microscopic Theory for the Optical Properties of Coulomb‐Correlated Semiconductors MF Pereira Jr, K Henneberger physica status solidi (b) 206 (1), 477-491 , 1998 1998 Citations: 51
Terahertz and mid infrared radiation: generation, detection and applications MF Pereira, O Shulika Springer , 2011 2011 Citations: 50
Green’s functions theory for semiconductor-quantum-well laser spectra MF Pereira Jr, K Henneberger Physical Review B 53 (24), 16485 , 1996 1996 Citations: 50
Theory of nonlinear optical absorption in coupled‐band quantum wells with many‐body effects MF Pereira Jr, R Binder, SW Koch Applied physics letters 64 (3), 279-281 , 1994 1994 Citations: 50
Effects of strain and Coulomb interaction on gain and refractive index in quantum-well lasers MF Pereira Jr, SW Koch, WW Chow Journal of the Optical Society of America B 10 (5), 765-773 , 1993 1993 Citations: 50
Impact of momentum dependent matrix elements on scattering effects in quantum cascade lasers T Schmielau, MF Pereira physica status solidi (b) 246 (2), 329-331 , 2009 2009 Citations: 48
Recent Progress in Light Polarization Control Schemes for Silicon Integrated Photonics H Zafar, MF Pereira Laser Photonics Rev, 2301025-1 -2301025-29 , 2024 2024 Citations: 47
Terahertz and mid infrared radiation: detection of explosives and CBRN (using terahertz) MF Pereira, O Shulika Springer , 2014 2014 Citations: 46
Influence of Coulomb correlations on gain and stimulated emission in (Zn, Cd) Se/Zn (S, Se)/(Zn, Mg)(S, Se) quantum-well lasers P Michler, M Vehse, J Gutowski, M Behringer, D Hommel, MF Pereira Jr, ... Physical Review B 58 (4), 2055 , 1998 1998 Citations: 46
Gain mechanisms and lasing in II–VI compounds MF Pereira Jr, K Henneberger physica status solidi (b) 202 (2), 751-762 , 1997 1997 Citations: 45
Intersubband gain without global inversion through dilute nitride band engineering MF Pereira, S Tomić Applied Physics Letters 98 (6) , 2011 2011 Citations: 44
Nato science for peace and security series B: physics and biophysics MF Pereira, O Shulika Springer Science+ Business Media BV , 2011 2011 Citations: 44
