Optical nanoimaging of gatetuneable graphene plasmons csic. Jun 20, 2012 optical nanoimaging of gatetunable graphene plasmons optical nanoimaging of gatetunable graphene plasmons chen, jianing. The incident photon is most sensitive to carrier concentration in graphene when its energy is around 2e f. Home research graphene infrared nanoimaging of graphene plasmons 2012 we performed infrared nano imaging experiments of graphene on sio 2. Flexible and electrically tunable plasmons in graphenemica. When the plasmons were resonant at the graphene metal surface, a strong electric field would be induced which could enhance the generation of electronhole pairs in the graphene layer. Wide angle dynamically tunable enhanced infrared absorption. In combination with static nanoimaging results on plasmon propagation, our. We observed for the first time graphene plasmon fringe pattern close to the edge of graphene, defects inside graphene, even the boudary between graphene and bilayer graphene fig. Tunable slow light effect based on dual plasmon induced. Exploiting the uniquely strong and gate tunable optical transitions of graphene, the authors are able to significantly modulate both the resonance frequency and quality factor of au nanorod plasmon.
Graphene optoelectronics and plasmonics for infrared. Tunable broadband plasmonic field enhancement on a graphene. Adaptive subwavelength control of nano optical fields. Home research graphene infrared nanoimaging of graphene plasmons 2012 we performed infrared nanoimaging experiments of graphene on sio 2. Optical nano imaging of gate tuneable graphene plasmons jianing chen,5,1, michela badioli,2, pablo alonsogonzalez1. In our work, we propose a highly tunable and angleinsensitive plasmon resonances based on graphene ringcircle arrays. It can be seen that this structure is composed of many periodic patterned graphene ribbons, and four graphene microchips with a same width and different length are placed on the both sides of each unit cell of main graphene band, as shown in fig. Gain modulation by graphene plasmons in aperiodic lattice. The mechanism of propagating graphene plasmons excitation using a nanograting and a fabryperot cavity as the optical coupling components is studied. Optical nano imaging of gatetunable graphene plasmons jianing chen 1,2, michela badioli 3, pablo alonsogonza. Here we demonstrate electrical tunability and hybridization of plasmons in graphene nanodisks and nanorings down to 3.
With this technique, we show in real space that common graphenesio. Simulated results exhibit that the outstanding midinfrared bandstop filtering effect is. Abstract plasmons produce large confinement and enhancement of. Optical nano imaging of gatetunable graphene plasmons. Optical nanoimaging of gatetuneable graphene plasmons.
Recently, graphene has also been shown to accommodate surface plasmons, observed via near field infrared optical microscopy techniques and infrared spectroscopy. Graphene optoelectronics and plasmonics for infrared frequencies. Jun 20, 2012 propagating optical plasmons collective electron excitations coupled to photons are launched in graphene and studied with nearfield optical microscopy, revealing ultrastrong optical. Tuning fano resonances with graphene purdue university. The resonance parameters depend on the dielectric function and geometry of the probe as well as on the. Graphene metamaterials based tunable terahertz absorber. Optical nanoimaging of gatetunable graphene plasmons optical nanoimaging of gatetunable graphene plasmons chen, jianing. In this paper we present the efficient design of functional thinfilm metamaterial devices with the effective surface conductivity approach.
We investigate optical field enhancement for a wide midinfrared range, originating from the excitation of graphene plasmons, by introducing a graded dielectric grating of varying period underneath a graphene monolayer. As an example, we demonstrate a graphene based perfect absorber. Tunable subwavelength photonic lattices and solitons in. The mica thin sheet acts as a highly flexible and transparent substrate with atomically flat surface for graphene. Optical nano imaging of gatetunable graphene plasmons article pdf available in nature 4877405. Optical nanoimaging of gatetunable graphene plasmons.
Jun 20, 2012 optical nanoimaging of gatetunable graphene plasmons. Exploiting the uniquely strong and gatetunable optical transitions of graphene, we are able to significantly modulate both the resonance frequency and quality factor of gold nanorod plasmon. Optical nano imaging of gate tunable graphene plasmons. This file contains supplementary text and data, supplementary figures 114 and supplementary. Photocurrent in graphene harnessed by tunable intrinsic. Excitation of the plasmonic mode can be achieved by illuminating a normalincidence plane wave on the gratings due to guidedmode resonance. However, to date, it is challenging to generate, detect, and control onchip graphene plasmons alloptically, a key step towards planar integration and nextgeneration highdensity optoelectronics. Pdf optical nanoimaging of gatetunable graphene plasmons. Jul 15, 2015 in this paper, the graphene ribbon bus waveguide sidecoupled a coplanar short graphene strip, constructed on a monolayer graphene with substrates by spatially varying external gates, is proposed and investigated numerically by using the finitedifference timedomain fdtd method.
Lavrinenko dtu fotonik, technical university of denmark, oersteds pl. Broadband gatetunable thz plasmons in graphene heterostructures. Highly confined tunable midinfrared plasmonics in graphene nanoresonators. By continuing to use this site you agree to our use of cookies. Infrared nanoimaging of graphene plasmons 2012 ucsd. Here, we experimentally demonstrate flexible and electrically tunable plasmonic devices with graphenemica heterostructures. Optical nano imaging of gatetunable graphene plasmons by jianing chen, michela badioli, pablo alonsogonzalez, s.
Our analysis shows that the plasmongraphene coupling is remarkably strong. Graphene has emerged as an outstanding material for optoelectronic applications due to its high electronic mobility and unique doping capabilities. Tunable terahertz filters based on graphene plasmonic all. A tunable terahertz filter based on graphene plasmonic alldielectric metasurfaces is proposed and investigated numerically by using the finitedifference timedomain fdtd method. Highly confined tunable midinfrared plasmonics in graphene. Optical nanoimaging of gatetuneable graphene plasmons core. Longlived, tunable intrinsic graphene surface plasmons sps have already been demonstrated in a number of experiments 39, including optical modulators 10, 11, providing the potential for applications 12. When the plasmons were resonant at the graphenemetal surface, a strong electric field would be induced which could enhance the generation of electronhole pairs in the graphene layer. By incorporating a highk al 2 o 3 layer as the gate. Surface plasmon resonance and gate tuning of graphene conductivity. This dissertation presents infrared nanospectroscopy and nanoimaging studies of graphene plasmons using scattering type scanning nearfield microscope a unique technique allowing efficient excitation and highresolution imaging of graphene plasmons. Electrical tuning of surface plasmon polariton propagation in.
After formulating the requirements to the perfect absorber in terms of surface conductivity we investigate the properties of graphene wire medium and graphene fishnet. Here we demonstrate polarizationsensitive and gatetunable photodetection in graphene nanoribbon arrays. Optical nanoimaging of gatetunable graphene plasmons nature. The plasmon dispersion, which follows usually the typical. Among the many intriguing properties of graphene, its plasmonic characteristics are some of the most fascinating and potentially useful 1, 2.
Zhipei sun,2 and xianfeng chen1 1 state key laboratory of advanced optical communication systems and networks. Long range surface plasmons in a symmetric graphene system. Osa mechanism of propagating graphene plasmons excitation. Max planck institute of quantum optics and center for nanoscience, 85714 garching. Abstract plasmons produce large confinement and enhancement of light that. Optical nanoimaging of gatetunable graphene plasmons article pdf available in nature 4877405. Pdf optical nanoimaging of gatetuneable graphene plasmons.
Graphene plasmonics for tunable terahertz metamaterials. Graphene plasmonics is an emergent research field, that is attracting plenty of interest and has already resulted in a textbook. The schematic illustration of this dual pit planar graphene ribbon structure is shown in fig. Here we demonstrate polarizationsensitive and gatetunable photodetection in. We exploit this strong optical field confinement to turn a graphene nanostructure into a tunable resonant plasmonic cavity with extremely small. Simulated results exhibit that the outstanding midinfrared bandstop filtering effect is realized based on the.
We activate plasmons with femtosecond optical pulses in a specimen of graphene that otherwise lacks infrared plasmonic response at equilibrium. Graphenes optical properties in the infrared and terahertz can be tailored and enhanced by patterning graphene into periodic metamaterials with subwavelength feature sizes. Although evidence of optical graphene plasmon resonances has recently been obtained spectroscopically7,8, no experiments so far have directly. Propagating optical plasmons collective electron excitations coupled to photons are launched in graphene and studied with nearfield optical microscopy, revealing ultrastrong optical. Exploiting the uniquely strong and gatetunable optical transitions of graphene, the authors are able to significantly modulate both the resonance frequency and quality factor of au nanorod plasmon. Plasmons driven by single electrons in graphene nanoislands.
Gatetuning of graphene plasmons revealed by infrared nano. Optical nanoimaging of gatetuneable graphene plasmons jianing chen,5,1, michela badioli,2, pablo alonsogonzalez 1, suko thongrattanasiri,3, florian huth 1,6, johann osmond 2, marko spasenovic 2, alba centeno 7, amaia. From a classical perspective, the latter is formed by electrons oscillating around their. Plasmons are directly launched in graphene, and their key parameters propagation and attenuation are studied with nearfield infrared nano imaging. Especially, hybrid alldielectric metasurfaces are used to make a whole singlesheet graphene forms two different conductivity patterns with the same gate voltage. The interaction is shown to be governed by a series of resonances corresponding to surface polariton modes localized near the probe. We provide realspace images of plasmon fields, and find that the extracted plasmon wavelength is very shortmore than 40 times smaller than the wavelength of illumination.
It is demonstrated that the system could be well described within the temporal coupled mode theory using two phenomenological parameters, namely, the intrinsic loss rate and the coupling rate of a graphene plasmonic. Electromagnetic interaction between a subwavelength particle the probe and a material surface the sample is studied theoretically. Adaptive subwavelength control of nanooptical fields. Propagating optical plasmons collective electron excitations coupled to photons are launched in graphene and studied with near. After formulating the requirements to the perfect absorber in terms of surface conductivity we investigate the properties of graphene wire medium and graphene fishnet metamaterials and. Electrically defined topological interface states of graphene. Concurrently thz generation has recently been revisited by a number of. Pdf emergence of material momentum in optical media.
To find out more, see our privacy and cookies policy. It is demonstrated that the system could be well described within the temporal coupled mode theory using two phenomenological parameters, namely, the intrinsic loss rate and the coupling rate of a graphene plasmonic mode, and their analytical. Potential applications of graphene plasmonics mainly addressed the terahertz to midinfrared frequencies, such as optical modulators, photodetectors, biosensors. Optical nanoimaging of gatetunable graphene plasmons core. Nature 2012623 optical nano imaging of gatetunable graphene plasmons. Gated tunability and hybridization of localized plasmons in.
Osa graphene metamaterials based tunable terahertz absorber. Infrared nanospectroscopy and nanoimaging of graphene. Jan 15, 2016 among the many intriguing properties of graphene, its plasmonic characteristics are some of the most fascinating and potentially useful 1, 2. Here we launch and detect propagating optical plasmons in tapered graphene nanostructures using nearfield scattering microscopy with infrared excitation light.
We exploit this strong optical field confinement to turn a graphene nanostructure into a tunable resonant plasmonic cavity with extremely small mode volume. Optical nano imaging of gate tuneable graphene plasmons. Gatetuning of graphene plasmons revealed by infrared nanoimaging. Ultrafast optical switching of infrared plasmon polaritons in. Tunable subwavelength photonic lattices and solitons in periodically patterned graphene monolayer changming huang, 1fangwei ye. The electrons in graphene behave like massless diracfermions, which results in the extraordinary properties, e. Gatetunable midinfrared plasmonic planar bandstop filters. Optical nanoimaging of gatetunable graphene plasmons by jianing chen, michela badioli, pablo alonsogonzalez, s. Innovative electromagnetic optical nanoantennas na functioning at. Photocurrent in graphene harnessed by tunable intrinsic plasmons. Graphene surface plasmons at the nearinfrared optical regime. Tunable bandstop filters for graphene plasmons based on. Electrical control of optical plasmon resonance with graphene. J chen, m badioli, p alonsogonzalez, s thongrattanasiri, f huth.
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