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Dynamic and Active THz Graphene Metamaterial Devices

NANOMATERIALS (2022)

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Summary: This study presents a dual-optoelectronic metadevice that integrates different materials to achieve ultra-wideband and multidimensional manipulation of higher-order Fano resonances, showing different manipulation behavior in thermal imbalance state. The device exhibits remarkable performance in modulation depth, resonant frequency shift, and tunable frequency range.

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Summary: This study demonstrates the use of electrolyte gating and ultrahigh-frequency technology to enhance the sensitivity of graphene biosensors. By canceling out ionic screening at ultrahigh frequencies, the biosensors can be directly used in high-salt solutions. By combining electrolyte gating and ultrahigh-frequency reflectometry, the graphene biosensors enable real-time monitoring of biomolecular and cell interactions with superior detection limits.

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Summary: This letter presents a reconfigurable picosecond pulse generator for impulse radar ultrawideband applications. It uses a mixed step recovery diode topology in combination with a non-linear transmission line and pulse-shaping circuit to achieve the direct switching between Gaussian and monocycle pulse shapes. The generator has a short pulse duration and promising ringing level, and it can be easily modified to generate other important pulse shapes.

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MuhibUr Rahman et al.

Summary: This paper presents a theoretical and experimental analysis of nonlinear magnetic transmission lines, exploring the phenomenon of simultaneous rise and fall time compression. The study investigates pulse generation, output waveforms, magnetic losses, and localized disturbances in ferrimagnetic materials, providing insight into the impacts of magnetic materials in the field of ultrafast electronics parallel with nonlinear electrical transmission lines.

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2D-patterned graphene metasurfaces for efficient third harmonic generation at THz frequencies

Anna Theodosi et al.

Summary: Graphene is a promising material for nonlinear applications in the THz regime due to its high third order nonlinearity and ability to support surface plasmons. In this study, 2D-patterned graphene-patch metasurfaces are investigated for efficient third harmonic generation. The efficiency is enhanced by aligning the fundamental and third harmonic frequencies with the metasurface resonances, achieved through 2D-patterning that modifies the dispersion of plasmons. High efficiencies of -20dB (1%) for input intensity 0.1 MW/cm(2) are achieved, and the results demonstrate the potential of graphene-based metasurfaces for nonlinear applications.

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Haiyun Yao et al.

Summary: The study presents three different types of terahertz modulators, utilizing graphene and metal-microstructure-integrated metamaterials, bare graphene films, and graphene-based all-dielectric metamaterials for design and characterization. Ultra-sensitive dynamic THz modulation is achieved by shifting the quasi-Fermi level of graphene, reaching a modulation depth of up to 346% and revealing a trend of modulation depth variation in the 0.2-2 THz range.

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Explicit Gain Equations for Hybrid Graphene-Quantum-Dot Photodetectors

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Summary: Coating graphene with quantum dots enhances light absorption and leads to high photogain. Light illumination narrows down the surface depletion region, creating a photovoltage that gates the graphene, resulting in high photogain in graphene.

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Tunnel field-effect transistors for sensitive terahertz detection

I. Gayduchenko et al.

Summary: The research addresses the challenge of ac-to-dc conversion in the sub-terahertz domain using tunnel field-effect transistors made of bilayer graphene. By creating a lateral tunnel junction and coupling it to an antenna exposed to THz radiation, high responsivity and low-noise detection are achieved. Switching from intraband Ohmic to interband tunneling regime significantly increases detectors' responsivity, showing the potential application of tunnel transistors for THz detection and the promising platform of BLG.

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Graphene Oxide/Hexylamine Superlattice Field-Effect Biochemical Sensors

Yingqi Huang et al.

Summary: The study developed a flexible GO/hexylamine 3D hybrid superlattice with exceptional electrical and sensing properties, enabling easy access to the field-effect sensing abilities of semiconducting 2D materials. The hybrid superlattice demonstrated outstanding sensing abilities to pH value and DNA molecules, while GO paper prepared by annealing lost such functionalities.

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Photodetectors of 2D Materials from Ultraviolet to Terahertz Waves

Qinxi Qiu et al.

Summary: 2D materials are considered promising for photodetectors due to their unique properties, but limitations such as low quantum efficiency, noise, and slow response are caused by their thinness. Current research focuses on improving the performance of 2D material photodetectors, but balancing sensitivity and response speed remains challenging.

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Graphene-based active metasurface with more than 330° phase tunability operating at mid-infrared spectrum

Zhanshan Sun et al.

Summary: Metasurfaces composed of graphene exhibit over 330 degrees of continuous phase modulation, enabling efficient modulation of scattered amplitude and phase, achieving arbitrary manipulation of scattered wavefront with electrically programmable metasurface. Numerically realized electro-optically tunable focusing and beam steering through one-dimensional discrete array element construction.

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Summary: Graphene exhibits exceptional nonlinear optoelectronic properties in the terahertz frequency range, surpassing other materials by orders of magnitude. Efficient control of graphene's terahertz nonlinearity through electrical gating, with minimal gating voltages, significantly enhances power conversion efficiency in third-harmonic generation. Experimental results are in quantitative agreement with a physical model of graphene nonlinearity, offering a basis for designing efficient electronic signal processing devices at ultrahigh frequencies.

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Surface Electromagnetic Performance Analysis of a Graphene-Based Terahertz Sensor Using a Novel Spectroscopy Technique

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Summary: This paper introduces a novel terahertz (THz) spectroscopy technique and a new graphene-based sensor with high precision and a wide frequency range. The sensor can detect thickness and relative permittivity effectively. By utilizing unique spectral features and analyzing equivalent circuits, the superiority of the sensor is demonstrated.

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High-precision digital terahertz phase manipulation within a multichannel field perturbation coding chip

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High-responsivity graphene photodetectors integrated on silicon microring resonators

S. Schuler et al.

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Augmented All-Optical Active Terahertz Device Using Graphene-Based Metasurface

Geunchang Choi et al.

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Antenna Enhanced Graphene THz Emitter and Detector

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NANO LETTERS (2015)

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A Novel Low-Ringing Monocycle Picosecond Pulse Generator Based on Step Recovery Diode

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PLOS ONE (2015)

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Highly tunable hybrid metamaterials employing split-ring resonators strongly coupled to graphene surface plasmons

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NATURE COMMUNICATIONS (2015)

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Thermodynamic picture of ultrafast charge transport in graphene

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NATURE COMMUNICATIONS (2015)

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Flexible metasurfaces and metamaterials: A review of materials and fabrication processes at micro- and nano-scales

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APPLIED PHYSICS REVIEWS (2015)

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Generation of cascaded four-wave-mixing with graphene-coated microfiber

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PHOTONICS RESEARCH (2015)

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Ultrathin Pancharatnam-Berry Metasurface with Maximal Cross-Polarization Efficiency

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Gate-Tunable Resonant Tunneling in Double Bilayer Graphene Heterostructures

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NANO LETTERS (2015)

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Nonlinear optical response of graphene in terahertz and near-infrared frequency regime

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Low-Bias Terahertz Amplitude Modulator Based on Split-Ring Resonators and Graphene

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ACS NANO (2014)

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Miniaturized tunable terahertz antenna based on graphene

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS (2014)

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High-Contrast Terahertz Wave Modulation by Gated Graphene Enhanced by Extraordinary Transmission through Ring Apertures

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NANO LETTERS (2014)

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Sensitive room-temperature terahertz detection via the photothermoelectric effect in graphene

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NATURE NANOTECHNOLOGY (2014)

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Photodetectors based on graphene, other two-dimensional materials and hybrid systems

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NATURE NANOTECHNOLOGY (2014)

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Efficient Nonlinear Generation of THz Plasmons in Graphene and Topological Insulators

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PHYSICAL REVIEW LETTERS (2014)

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Direct generation of graphene plasmonic polaritons at THz frequencies via four wave mixing in the hybrid graphene sheets waveguides

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OPTICS EXPRESS (2014)

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Controlling graphene plasmons with resonant metal antennas and spatial conductivity patterns

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SCIENCE (2014)

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Ultra-Broadband Photodetector for the Visible to Terahertz Range by Self-Assembling Reduced Graphene Oxide-Silicon Nanowire Array Heterojunctions

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SMALL (2014)

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Infrared Wavefront Control Based on Graphene Metasurfaces

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ADVANCED OPTICAL MATERIALS (2014)

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Total Absorption in a Graphene Mono layer in the Optical Regime by Critical Coupling with a Photonic Crystal Guided Resonance

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Terahertz Antenna Phase Shifters Using Integrally-Gated Graphene Transmission-Lines

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION (2013)

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THz Wave Modulators: A Brief Review on Different Modulation Techniques

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Nonlinear THz Conductivity Dynamics in P-Type CVD-Grown Graphene

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Enhanced Optical Second-Harmonic Generation from the Current-Biased Graphene/SiO2/Si(001) Structure

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NANO LETTERS (2013)

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Low-Bias Active Control of Terahertz Waves by Coupling Large-Area CVD Graphene to a Terahertz Metamaterial

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NANO LETTERS (2013)

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A terahertz photomixer based on plasmonic nanoantennas coupled to a graphene emitter

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NANOTECHNOLOGY (2013)

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Third harmonic generation in graphene and few-layer graphite films

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PHYSICAL REVIEW B (2013)

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Spectrally Wide-Band Terahertz Wave Modulator Based on Optically Tuned Graphene

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ACS NANO (2012)

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Terahertz-field-induced insulator-to-metal transition in vanadium dioxide metamaterial

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Graphene field-effect transistors as room-temperature terahertz detectors

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NATURE MATERIALS (2012)

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Switching terahertz waves with gate-controlled active graphene metamaterials

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NATURE MATERIALS (2012)

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From metamaterials to metadevices

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NATURE MATERIALS (2012)

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Second harmonic generation in multilayer graphene induced by direct electric current

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PHYSICAL REVIEW B (2012)

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Carrier Relaxation in Epitaxial Graphene Photoexcited Near the Dirac Point

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PHYSICAL REVIEW LETTERS (2011)

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Electronic transport in two-dimensional graphene

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REVIEWS OF MODERN PHYSICS (2011)

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Hot Carrier-Assisted Intrinsic Photoresponse in Graphene

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SCIENCE (2011)

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Present and Future of Terahertz Communications

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IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY (2011)

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Large Enhancement of Nonlinear Optical Phenomena by Plasmonic Nanocavity Gratings

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NANO LETTERS (2010)

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Coherent Nonlinear Optical Response of Graphene

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PHYSICAL REVIEW LETTERS (2010)

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The Physics of ultrafast saturable absorption in graphene

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OPTICS EXPRESS (2010)

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Strong nonlinear optical response of graphene in the terahertz regime

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APPLIED PHYSICS LETTERS (2009)

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Graphene Nanoribbon Phototransistor: Proposal and Analysis

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JAPANESE JOURNAL OF APPLIED PHYSICS (2009)

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The electronic properties of graphene

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REVIEWS OF MODERN PHYSICS (2009)

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Device model for graphene nanoribbon phototransistor

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APPLIED PHYSICS EXPRESS (2008)

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Measurement of the optical absorption spectra of epitaxial graphene from terahertz to visible

Jahan M. Dawlaty et al.

APPLIED PHYSICS LETTERS (2008)

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Nonlinear electromagnetic response of graphene: frequency multiplication and the self-consistent-field effects

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JOURNAL OF PHYSICS-CONDENSED MATTER (2008)

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Universal optical conductance of graphite

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PHYSICAL REVIEW LETTERS (2008)

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Measurement of the Optical Conductivity of Graphene

Kin Fai Mak et al.

PHYSICAL REVIEW LETTERS (2008)

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Fine structure constant defines visual transparency of graphene

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SCIENCE (2008)

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Frequency selective surfaces for high sensitivity terahertz sensing

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APPLIED PHYSICS LETTERS (2007)

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Optical far-infrared properties of a graphene monolayer and multilayer

L. A. Falkovsky et al.

PHYSICAL REVIEW B (2007)

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Negative dynamic conductivity of graphene with optical pumping

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JOURNAL OF APPLIED PHYSICS (2007)

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Cutting-edge terahertz technology

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NATURE PHOTONICS (2007)

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Active terahertz metamaterial devices

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NATURE (2006)

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Second harmonic generation from patterned GaAs inside a subwavelength metallic hole array

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OPTICS EXPRESS (2006)

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Strong modification of the nonlinear optical response of metallic subwavelength hole arrays

J. A. H. van Nieuwstadt et al.

PHYSICAL REVIEW LETTERS (2006)

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