Rustam A. Khabibullin

Rustam A. Khabibullin
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Moscow Institute of Physics and Technology | MIPT

PhD . Group Leader at IUHFSE RAS

About

178
Publications
22,361
Reads
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1,117
Citations
Introduction
Prof. Rustam Khabibullin is working on the development of THz sources and detectors utilizing different physical principles. He is mainly focused on THz quantum cascade lasers for high-resolution spectroscopy and THz imaging systems. His expertise lies in the physics of intersubband devices, molecular beam epitaxy of A3B5 material systems and post-growth technology of semiconductor source and detectors of THz radiation. Personal page: http://new.isvch.ru/sotr/khabibullin_en/
Additional affiliations
January 2014 - present
Institute of Ultra High Frequency Semiconductor Electronics RAS
Position
  • Scientific secretary
January 2013 - January 2014
Institute of Ultra High Frequency Semiconductor Electronics RAS
Position
  • Senior Researcher
January 2012 - January 2013
Institute of Ultra High Frequency Semiconductor Electronics RAS
Position
  • Researcher
Education
May 2009 - May 2011
National Research Nuclear University MEPhI
Field of study
  • Physics of low-dimentional heterostructures and microwave nano-electronics
September 2003 - March 2009
Moscow Engineering Physics Institute
Field of study
  • Solid State Physics

Publications

Publications (178)
Article
Full-text available
We report on the implementation of a terahertz two-photon quantum cascade laser operating in a continuous wave mode. Lasers that can emit two photons as a result of the relaxation of a single electron between two states of the same parity have been discussed since the early days of the laser era, but implementation has been hampered by the lack of...
Article
Full-text available
Coherent mode locking is based on the formation of 2π\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$2\pi$$\end{document} pulses of self-induced transparency in the abs...
Article
We propose, simulate and investigate how the thickness of plasmonic electrode h and the ratio between h and the period of subwavelength periodical metallic (plasmonic) grating h/p on the THz emission efficiency in a photoconductive emitter. By numerical optimization we determine the grating geometry with respect to maximal optical transmission. We...
Article
We registered a significant decrease of the noise current of a photoconductive antenna (PCA), which is based on a strain-induced InAlAs/InGaAs superlattice with an ultrashort photocarrier lifetime due to a decrease in the focal spot size of a probe laser beam. We showed that the proposed PCA-detector exhibits merely a 1.5-fold increase of the noise...
Article
Full-text available
For a GaAs/AlGaAs terahertz (THz) quantum cascade laser (QCL) with a double metal waveguide (DMWG) based on Au and Cu metal plates and Ti and Ta adhesion layers, the dumping parameters and THz mode loss spectra were calculated. It has been shown that to minimize losses in high-temperature DMWG QCL designs, it is advisable to use Ti less than 5 nm t...
Preprint
Full-text available
Coherent mode locking is based on the formation of 2π pulses of self-induced transparency in the absorbing medium and π pulses in the amplifying medium. In this regime it becomes possible to generate ultrashort laser pulses down to one oscillation cycle with a pulse duration being much shorter than the polarization relaxation time T 2 of the amplif...
Article
Full-text available
A band design of a quantum cascade laser with a generation frequency higher than 6 THz and an active region based on four GaAs/Al0.14Ga0.86As quantum wells is proposed. Calculations were carried out based on the solution of the Schrödinger equation taking into account the dephasing of quantum states, as well as a closed system of balance equations....
Article
Full-text available
Experimental observation of the enhanced terahertz (THz) emission in a large-area photoconductive antenna-emitter (LAE), boosted by an array of cylindrical sapphire-fiber-based microlenses, is reported. The observed enhancement is achieved, thanks to the sharp focusing of a pump laser beam near the semiconductor surface, for which the high-refracti...
Article
In this work, we conduct research of spectral and power characteristics of quantum cascade lasers (QCLs) based on a GaAs/Al0.15Ga0.85As active region emitting at 2.3 (A), 3.2 (B) and 4.1 (C) THz. The QCL devices had a double-metal Au waveguide and operated in pulsed mode with 1.5–9 μs pulses at 20 Hz repetition rate. Using the integral output power...
Article
Full-text available
Subject of study. The interaction of mid-infrared (IR) light with a metasurface based on silicon scattering elements on a sapphire substrate and its subsequent propagation in the far field were studied. Aim of study. The aim was the development of the metasurface design, its manufacture, and the formation of a vortex beam with a helicoidal wavefron...
Article
Subject of study. Interaction of mid-infrared light with a metasurface based on silicon scattering elements on a sapphire substrate and its subsequent propagation in the far field. Aim of study. Development of the metasurface design, its manufacture and formation with its help of a vortex beam with a helicoidal wavefront in the medium-wave infrared...
Article
Full-text available
Compact and cost-effective spectrometers and ima- ging systems in the terahertz (THz) frequency range based on optical-THz photoconductive converters of ultrashort laser pulses (photoconductive antennasÐPCAs) are actively being developed and widely used to solve fundamental and applied problems in a variety of fields of science and technology. This...
Article
Due to their high optical phonon energies GaInP/AlGaInP heterostructures are a promising active medium to solve the problem of creating compact semiconductor sources with an operating frequency range of 5.5-7 THz. In this work, the temperature dependences of gain and absorption at 6.4-6.9 THz have been calculated for a GaInP/AlGaInP-based quantum-c...
Article
Full-text available
The charge carrier density distribution in uniformly doped AlGaAs/GaAs superlattices with layer thicknesses of 1.5/10 nm and different numbers of quantum wells was studied. Both energy band theory and capacitance-voltage profiling were used to determine the carrier concentration profiles of the structures. During the analysis of the experimental an...
Preprint
Due to their high optical phonon energies GaInP/AlGaInP heterostructures are a promising active medium to solve the problem of creating compact semiconductor sources with an operating frequency range of 5.5-7 THz. In this work, the temperature dependences of gain and absorption at 6.8 THz have been calculated for a GaInP/AlGaInP-based quantum-casca...
Article
The paper proposes designs of distributed resonant tunneling diodes (RTDs) with a double metal waveguide (DMW), in the top electrode of which a periodic pattern (metasurface) is formed based on holes in a hexagonal array and a chain of slotted (split-ring) resonators. This solution will make it possible to control the phase velocity of the propagat...
Article
Full-text available
We report on InGaAs/GaAs quantum dot injection microdisk lasers laterally connected with a bus waveguide fabricated by planar technology from the same epi-structure. Various coupling schemes of microlaser with waveguide are studied including a microlaser attached to a waveguide (zero gap), a 100 nm gap for evanescence light outcoupling, and with a...
Article
In this paper, we present a new approach for the enhancement of pulsed terahertz (THz) generation in quantum dot (QD) based photoconductive antennas (PCA). We demonstrate the benefits of the combination of a QD substrate based PCA and an interdigitated electrodes topology which allows the photocarriers to reach the antenna terminals in a quasi-ball...
Article
Компактные и недорогие спектрометры и системы визуализации в терагерцевом (ТГц) диапазоне частот на основе оптико-ТГц фотопроводящих преобразователей ультракоротких лазерных импульсов (фотопроводящих антенн – ФПА) активно развиваются и находят широкое применение в решении фундаментальных и прикладных проблем в самых разных областях науки и техники....
Article
Full-text available
We proposed several types of design of terahertz emitters based on the perfect AlGaAs/GaAs superlattices obtained by molecular-beam epitaxy. Transition energies, gain, and losses are calculated for the developed structures, which determined the design of the created experimental structures.
Article
We study the band designs of terahertz quantum–cascade lasers (THz QCLs) with an active region of GaAs/AlxGa1−xAs quantum wells (QWs) by using the solution of the Schrödinger equation with allowance for dephasing of quantum states, as well as solving a system of closed balance equations. For two-QW designs with increased AlxGa1−xAs potential barrie...
Article
Full-text available
Plasmonic metasurfaces for photoconductive antennas (PCAs) based on InAlAs/InGaAs superlattice heterostructures are proposed and fabricated. It is found by the measurements of the PCAs in a terahertz pulsed spectrometer that the maximum detected integrated terahertz power is 5.3 μW (the optical-to-THz conversion efficiency is 0.19%) under laser pum...
Article
Full-text available
In this paper, we describe the effect of local electric field enhancement due to the existence of photonic edge states in a nanoplasmonic crystal. These states can be excited by a normal incident wave and are localized along the continuous line defect, where translational symmetry is broken. The nanoplasmonic crystal is formed by a triangular latti...
Article
Full-text available
We propose the design of a photoconductive antenna (PCA) emitter with a plasmonic grating featuring a very high plasmonic Au electrode with a thickness of 170 nm. As we show numerically, the increase in h significantly changes the electric field distribution, owing to the excitation of higher-order plasmon guided modes in the Au slit waveguides, le...
Article
Double-barrier GaAs/AlAs resonant tunneling diodes (RTDs) have become the promising elements for the development of sub-mm and THz emitters. We report on the fabrication of the RTD samples that were characterized via RF-reflectometry to determine the parameters of its equivalent circuit. By using numerical simulation we show that the coplanar trans...
Article
Full-text available
Double-barrier GaAs/AlAs resonant tunneling diodes (RTDs) have become the promising elements for the development of sub-mm and THz emitters. We report on the fabrication of the RTD samples that were characterized via RF-reflectometry to determine the parameters of its equivalent circuit. By using numerical simulation we show that the coplanar trans...
Article
We have detected subterahertz spectral lines in the emission of free-running GaAs/AlGaAs quantum cascade lasers (QCLs) operating around 3 THz. We have found that the power W( f d ) of an individual sub-THz line at the frequency f d is directly proportional to a power product W( f i ) × W( f k ) of the corresponding pair of THz lines having the freq...
Article
We report the seminal approach for localization of photocarriers in a photoconductive antenna (PCA)-emitter via the focusing element comprising the sapphire fiber. Using numerical simulation, we showed that at the certain ratio between the fiber diameter and the gap size, i.e. d/g = 22.5, one can attain a 35-fold enhancement of the laser irradiatio...
Article
Full-text available
HgCdTe is promising as a material to solve a problem of the development of semiconductor sources with an operational frequency range of 6–10 THz due to the small optical phonon energies and electron effective mass. In this study, we calculate the dependence of the metal–metal waveguide characteristics on the number of cascades for the 3-well design...
Article
Full-text available
The effect of gain saturation in quantum-cascade structures with 2–4 quantum wells per period is herein analyzed on the basis of a system of balance equations. It is shown that the nonlinearity parameter decreases with an increase in the relaxation rate of laser levels, but the total current through the structure also increases. The use of the prop...
Conference Paper
Full-text available
A new lasing scheme with sequential two-photon emission in the gain module for terahertz quantum cascade laser (THz QCL) is proposed and experimentally demonstrated. THz QCLs based on MBE- and MOCVD-grown structures with two-photon design have a lasing frequency of 3.8 THz and maximum operation temperature around 100 K.
Article
Full-text available
Objectives. Terahertz quantum-cascade lasers (THz QCLs) are compact solid-state lasers pumped by electrical injection to generate radiation in the range from 1.2 to 5.4 THz. The THz QCL operating frequency band contains absorption lines for a number of substances that are suitable for biomedical and environmental applications. In order to reduce th...
Article
The design of a terahertz (THz) quantum cascade laser (QCL) with an active module based on three GaAs/Al0.18Ga0.82As quantum wells for high-temperature generation at a frequency of about 3.3 THz is optimized. A heterostructure based on the developed design with an active region thickness of 10 μm is grown by molecular-beam epitaxy with a deviation...
Article
Full-text available
We report on a sapphire-fiber-based lens that can be used to enhance the emitted THz power of a large-area photoconductive antenna (PCA). Using numerical simulations, we demonstrate that the lens provides a spatial redistribution of the photocarriers density in the PCA’s gap. By optimizing the diameter of the sapphire-fiber, one could reach efficie...
Article
Terahertz quantum cascade lasers (THz QCLs) are prospective radiation sources for high-resolution gas spectroscopy. A wide range of operating frequencies (from 1.2 to 5.4 THz), a narrow generation line (up to 10 kHz), the ability to operate on several radiative transitions (two-color lasers, generation of frequency combs) and other unique character...
Article
We report on the development and fabrication of a plasmonic metasurfaces for PCA based on InAlAs/InGaAs superlattice heterostructures. As a result of THz time-domain measurements, it was found that for PCA emitters with a 150 nm thick plasmonic metasurface, the maximum recorded overall THz power was 5.3 (the optical-THz conversion efficiency was 0....
Article
Full-text available
Beginning from the 1990s, an ever-lasting interest in the THz spectroscopy and THz instruments has produced wide progress in the development of high-speed THz detectors. The constantly growing requirements aimed at the increase of spectral resolution, sensitivity, and acquisition rate of THz detectors have attracted much attention in this field til...
Article
Full-text available
We have demonstrated a quantum cascade laser (QCL) with a generation frequency of about 3.8 THz, grown by metal-organic vapor phase epitaxy. The multilayer heterostructure for QCLs consists of 185 repetitions of an active module containing four GaAs/Al0.15Ga0.85As quantum wells. The threshold current and threshold voltage of the fabricated QCL were...
Article
Full-text available
In this work, we conduct research of spectral and power characteristics of quantum cascade lasers (QCLs) based on a GaAs/Al0.15Ga0.85As active region emitting at 2.3 (A), 3.2 (B) and 4.1 (C) THz. The QCL devices had a double-metal Au waveguide and operated in pulsed mode with 1.5–9 us pulses at 20 Hz repetition rate. Using the integral output power...
Article
Full-text available
We have demonstrated a quantum cascade laser (QCL) with a generation frequency of about 3.8 THz, grown by metal-organic vapor phase epitaxy. The multilayer heterostructure for QCLs consists of 185 repetitions of an active module containing four GaAs/Al 0.15 Ga 0.85 As quantum wells. The threshold current and threshold voltage of the fabricated QCL...
Conference Paper
Full-text available
The possibility of implementing two radiation transitions in the gain module for THz QCL has been shown many times [1,2]. However, the activation of these transitions is achieved at different bias points, which corresponds to the optimal alignment of energy levels for each transition. We propose to add an additional step to the ladder of energy lev...
Article
We study the band designs of terahertz quantum-cascade lasers (THz QCLs) with an active region of GaAs/AlxGa1−xAs quantum wells (QWs) by using the solution of the Schr¨odinger equation with allowance for dephasing of quantum states, as well as solving a system of closed balance equations. For two-QW designs with increased AlxGa1−xAs potential barri...
Article
In this work, we conduct research of spectral and power characteristics of quantum cascade lasers (QCLs) based on a GaAs/Al 0.15 Ga 0.85 As active region emitting at 2.3 (A), 3.2 (B) and 4.1 (C) THz. The QCL devices had a double-metal Au waveguide and operated in pulsed mode with 1.5-9 μs pulses at 20 Hz repetition rate. Using the integral output p...
Article
Full-text available
We report a seminal approach for localization of photocarriers in a photoconductive antenna (PCA)-emitter via a focusing element comprising the sapphire fiber. Using numerical simulation, we showed that at a certain ratio between the fiber diameter and antenna gap size (d/g~ 22.5), one can attain a ~ 35-fold enhancement of laser irradiation in the...
Article
Full-text available
Over the past two decades, the operation temperature of terahertz quantum cascade lasers (THz QCLs) has continuously increased from cryogenic level to the current record value of 250 K (about -23°C) [1]. Here we review the state-of-the-art and future prospects of high-temperature THz QCL designs with two-quantum wells in active module based on conv...
Article
Full-text available
Как известно, идея создания источника излучения, основанного на последовательном испускании фотонов электроном в структуре множественных квантовых ям, получившего впоследствии название квантового каскадного лазера (ККЛ), была высказана в СССР еще в 1971 г. [1], однако потребовалось более 20 лет для реализации первого ККЛ, работающего в среднем ИК д...
Article
Full-text available
Terahertz (THz) technology is promising in several applications such as imaging, spectroscopy and communications. Among several methods in the generation and detection of THz waves, a THz time-domain system that is developed using photoconductive antennas (PCA) as emitter and detector presents several advantages such as simple alignment, low cost,...
Article
Full-text available
In this Letter, optical-to-terahertz (THz) conversion of 800 nm femtosecond laser pulses in large-area bias-free InGaAs emitters based on photo-Dember (PD) and lateral photo-Dember (LPD) effects is experimentally investigated. We use metamorphic buffers to grow sub-micrometer thick ${{\rm In}_x}{{\rm Ga}_{1 - x}}{\rm As}$ I n x G a 1 − x A s layers...
Conference Paper
Full-text available
We report on two approaches aimed at increasing the performance of a photoconductive antenna (PCA) due to enhanced optical light confinement in a PCA's gap. The first refers to the use of a high-aspect ratio metal grating maintaining plasmonic guided modes while the second implies an asymmetric dielectric particle combined with a prism on a metal s...
Conference Paper
We have designed and fabricated 2.3 THz QCL with active module based on 4 QWs GaAs/Al0.15Ga0.85As. The light-current-voltage (L-I-V) characteristics and emission spectra of fabricated THz QCL are investigated. The nonmonotonic behavior of L–I characteristic and a large number of discontinuities in I-V characteristic is observed. Our calculations sh...
Preprint
Full-text available
Terahertz (THz) technology is promising in several applications such as imaging, spectroscopy and communications. Among several methods in the generation and detection of THz waves, a THz time domain system (TDS) that is developed using photoconductive antennas (PCA) as emitter and detector presents several advantages such as simple alignment, low...
Article
We report on a THz detector based on a photoconductive antenna (PCA) utilizing an artificially strained undoped InGaAs/InAlAs superlattice (SL). Using our laboratory pulsed THz time-domain spectrometer, we demonstrate the advancement of the strain-induced SL-based PCA-detector (SID) when operating with an optical probe power of Popt >6 mW over the...
Article
Full-text available
We report on the experimental observation of the curved plasmonic beam, a plasmonic hook (PH), for surface plasmon-polariton (SPP) waves. The SPP PH effect could be obtained with a cuboid particle with broken shape symmetry fabricated with a relatively simple routine. This has a pronounced difference with fabrication of structure for generation of...
Article
We describe a method of parameters extraction for the lumped element network representing resonant tunneling diodes (RTDs). The method is based on onchip reflection coefficient measurements in a wide frequency range from 1 kHz up to 60 GHz in combination with differential resistance measurements. We have proposed and fabricated double-barrier GaAs/...
Article
Quantum cascade lasers (QCL) are widely adopted as prominent and easy-to-use solid-state sources of terahertz radiation. Yet some applications require generation and detection of very sharp and narrow terahertz-range pulses with a specific spectral composition. We have studied time-resolved light-current (L–I) characteristics of multimode THz QCL o...