Article
Optics
Haonan Ling, Arnab Manna, Jialiang Shen, Ho-Ting Tung, David Sharp, Johannes Froch, Siyuan Dai, Arka Majumdar, Artur R. Davoyan
Summary: This study investigates the interaction between light and matter in van der Waals MoS2 nanophotonic devices and demonstrates deep subwavelength optical field confinement in nanostructures, which has the potential to significantly reduce the size of integrated photonic devices and opto-electronic circuits.
Article
Chemistry, Multidisciplinary
Theis P. P. Rasmussen, A. Rodriguez Echarri, F. Javier Garcia de Abajo, Joel D. D. Cox
Summary: The subwavelength plasmonic near-field enhancement is hindered by large ohmic losses in good plasmonic materials, while conventional phase-matching of fields in bulk nonlinear crystals is not suitable for realizing nonlinear optical phenomena on the nanoscale. In contrast, highly-doped graphene supports long-lived, highly-confined, and actively-tunable plasmons, making it an excellent platform for both plasmonics and nonlinear optics. By interfacing multiple graphene nanostructures in close proximity, we can trigger nonlocal effects associated with large gradients in the electromagnetic near field to enhance nonlinear response.
Article
Chemistry, Multidisciplinary
Alex E. Chen, Xue-Qun Xia, Jian-Shiung Hong, Kuan-Ren Chen
Summary: The study finds that light funneling can guide the flow of energy into subwavelength slits. In contrast to previous research on oblique incident light, this study reveals that light funneling in the slits can be highly asymmetric, even at small angles. This mechanism is explained by polarized fields and charges induced using Poynting vectors. It is shown that when light is obliquely incident to the slits perforated in a perfect electric conductor, asymmetrical fields and charges accumulate at the upper apex corners of the left (right) sides. When light is incident from the left (right) side, more (less) induced fields and charges accumulate in the left (right) slit corner, resulting in an increase (decrease) in the funneling width, area, and energy flow at the left (right) side.
Article
Nanoscience & Nanotechnology
Irati Alonso Calafell, Lee A. Rozema, David Alcaraz Iranzo, Alessandro Trenti, Philipp K. Jenke, Joel D. Cox, Avinash Kumar, Hlib Bieliaiev, Sebastien Nanot, Cheng Peng, Dmitri K. Efetov, Jin-Yong Hong, Jing Kong, Dirk R. Englund, F. Javier Garcia de Abajo, Frank H. L. Koppens, Philip Walther
Summary: Graphene-insulator-metal heterostructures exhibit significantly enhanced optical nonlinearity, offering potential for optically controlled and electrically tunable nano-optoelectronic devices.
NATURE NANOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Philipp Grimm, Stefan Zeissner, Maximilian Roedel, Simon Wiegand, Sebastian Hammer, Monika Emmerling, Enno Schatz, Rene Kullock, Jens Pflaum, Bert Hecht
Summary: This study presents a nanoscale organic light-emitting antenna (OLEA) structure that serves as a color- and directionality-switchable light source. The structure utilizes gold nanoantennas and an organic semiconductor to achieve color and emission direction switching based on the polarity of the applied voltage. The OLEA structure facilitates efficient radiation transfer and eliminates the need for transparent electrodes.
Article
Materials Science, Multidisciplinary
M. Sanchez Sanchez, G. Gomez-Santos, T. Stauber
Summary: This paper discusses novel transverse plasmon polaritons in AA- and AB-stacked bilayer graphene and explains their magnetic excitation characteristics. For AA-stacked bilayer graphene, a symmetry-broken ground state leading to potential ferromagnetism is predicted, which might be relevant for the electronic properties of magic angle twisted bilayer graphene samples.
Article
Physics, Multidisciplinary
Mikkel Have Eriksen, Jakob E. Olsen, Christian Wolff, Joel D. Cox
Summary: This paper investigates the emergence and active control of optical bistability in a two-level atom near a graphene sheet. It is found that by adjusting the electrically tunable interband transition threshold in graphene, the emitted light from the atom exhibits electro-optical bistability and hysteresis in terms of intensity, spectrum, and quantum statistics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
W. J. M. Kort-Kamp, F. J. Culchac, F. S. S. Rosa, C. Farina, Rodrigo B. Capaz, F. A. Pinheiro
Summary: This study investigates the electromagnetic local density of states near a twisted bilayer graphene deposited on an isotropic substrate. The conductivity of the TBG shows a nontrivial dependence on the twist angle, leading to moire pattern-dependent quantum emission. The presence or absence of surface plasmon polaritons explains the impressive variation in LDOS at specific twist angles compared to monolayer graphene.
Article
Nanoscience & Nanotechnology
Young-Ho Jin, Juntaek Oh, Wonshik Choi, Myung-Ki Kim
Summary: The paper proposes a novel method to resolve individual eigenmodes of subwavelength nanostructures. By constructing a transmission matrix and utilizing singular value decomposition, the near-field profiles and energy spectra of individual eigenmodes can be effectively resolved. This method has significant implications for designing and utilizing optical devices.
Article
Materials Science, Multidisciplinary
C. J. Valencia-Caicedo, E. I. Chaikina, A. V. Khomenko
Summary: We numerically studied the second-harmonic generation (SHG) from subwavelength GaAs relief gratings with and without Au nano-stripes. Our results showed that adding Au nano-stripes significantly enhanced the SHG efficiency, with more than 500 times enhancement and an absolute value of 1.2 x 10(-3)% when the intensity of pump light was 1 GW/cm(2).
RESULTS IN PHYSICS
(2022)
Article
Optics
Devashish Pandey, Sanshui Xiao, Martijn Wubs
Summary: This study investigates the sensitivity of the optical absorption of multilayer graphene structure to subnanometer interlayer separation. The results show that neglecting the interlayer separation leads to upper bounds on the absorption, while finite interlayer separations greatly affect the absorption. A closed-form analytical expression for the absorption is derived for an infinite number of graphene layers. The findings highlight the importance of considering subnanometer interlayer separations for accurate modeling and prediction of the optical properties of multilayer Van der Waals crystals suitable for coherent perfect absorption.
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This study investigates photonic-crystal-like devices and microcavities in graphene. The results show that these graphene-based devices can be significantly smaller in size compared to conventional photonic crystals, thanks to the shorter optical transport wavelength in graphene. By changing the applied voltage, the functionality of the devices can be altered, making them highly programmable and adjustable. Furthermore, these devices can be integrated with traditional microelectronic circuits, leading to potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This theoretical study investigates photonic-crystal-like devices and microcavities in graphene. The results show that graphene-based devices can be scaled down significantly compared to conventional photonic crystals due to the shorter optical transport wavelength in graphene. The devices have high programmability and can be integrated with traditional microelectronic circuits, offering potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Fedir O. Yevtushenko, Sergii Dukhopelnykov, Yuriy G. Rapoport, Tatiana L. Zinenko, Alexander Nosich
Summary: This study reports on a previously unexplored optical effect where a narrowband regime of electromagnetically induced transparency (EIT) is observed in a grating of narrow graphene strips. The tunability of reflectance and absorbance in this regime is significantly limited due to the field distribution pattern caused by lattice modes.
Article
Engineering, Electrical & Electronic
Xuanru Zhang, Tie Jun Cui
Summary: The study introduces a novel toroidal plasmonic resonator that tightly compacts all resonance modes and reduces radiation loss, achieving a high quality factor. A trapped mode is excited by introducing a slit perturbation, doubling the confinement effect. The on-chip excitation of the trapped mode is analyzed, showing good agreement between experimental results and numerical simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
