Ultrafast opto-acoustic modulation of light reflectance in metal-insulator-metal epsilon-near-zero nanocavities

2021 ◽  
Author(s):  
Joel Kuttruff ◽  
Roman Krahne ◽  
Antonio de Luca ◽  
Vincenzo Caligiuri ◽  
Nicolò Maccaferri
Keyword(s):  
Metal Insulator ◽  
Metal Insulator Metal ◽  
Light Reflectance ◽  
Acoustic Modulation ◽  
Epsilon Near Zero

scholarly journals Hybridization of epsilon-near-zero modes via resonant tunneling in layered metal-insulator double nanocavities

Nanophotonics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1505-1512 ◽  
Author(s):  
Vincenzo Caligiuri ◽  
Milan Palei ◽  
Giulia Biffi ◽  
Roman Krahne
Keyword(s):  
Resonant Tunneling ◽  
Classical Model ◽  
Double Quantum ◽  
Geometrical Parameters ◽  
Metal Insulator ◽  
Mode Splitting ◽  
Metal Insulator Metal ◽  
Fine Control ◽  
Matching Techniques ◽  
Epsilon Near Zero

AbstractThe coupling between multiple nanocavities in close vicinity leads to the hybridization of their modes. Stacked metal-insulator-metal (MIM) nanocavities constitute a highly versatile and very interesting model system to study and engineer such mode coupling, as they can be realized by lithography-free fabrication methods with fine control on the optical and geometrical parameters. The resonant modes of such MIM cavities are epsilon-near-zero (ENZ) resonances, which are appealing for nonlinear photophysics and a variety of applications. Here, we study the hybridization of ENZ resonances in MIMIM nanocavities, obtaining a very large mode splitting reaching 0.477 eV, Q-factors of the order of 40 in the visible spectral range, and fine control on the resonance wavelength and mode linewidth by tuning the thickness of the dielectric and metallic layers. A semiclassical approach that analyzes the MIMIM structure as a double quantum well system allows to derive the exact analytical dispersion relation of the ENZ resonances, achieving perfect agreement with numerical simulations and experiments. Interestingly, the asymmetry of the mode splitting in a symmetric MIMIM cavity is not reflected in the classical model of coupled oscillators, which can be directly related to quantum mechanical tunneling for the coupling of the two cavities. Interpreting the cavity resonances as resonant tunneling modes elucidates that they can be excited without momentum matching techniques. The broad tunability of high-quality ENZ resonances together with their strong coupling efficiency makes such MIMIM cavities an ideal platform for exploring light-matter interaction, for example, by the integration of quantum emitters in dielectric layers.

scholarly journals An Electrically Tunable Dual-Wavelength Refractive Index Sensor Based on a Metagrating Structure Integrating Epsilon-Near-Zero Materials

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2301
Author(s):  
Zhenya Meng ◽  
Hailin Cao ◽  
Run Liu ◽  
Xiaodong Wu
Keyword(s):  
Refractive Index ◽  
Indium Tin Oxide ◽  
Figure Of Merit ◽  
Refractive Index Sensor ◽  
Perfect Absorption ◽  
Metal Insulator ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
Metal Insulator Metal ◽  
Epsilon Near Zero

In this paper, a reconfigurable sensing platform based on an asymmetrical metal-insulator-metal stacked structure integrating an indium tin oxide (ITO) ultrathin film is proposed and investigated numerically. The epsilon-near-zero (ENZ) mode and antisymmetric mode can be resonantly excited, generating near-perfect absorption of over 99.7% at 1144 and 1404 nm, respectively. The absorptivity for the ENZ mode can be modulated from 90.2% to 98.0% by varying the ENZ wavelength of ITO by applying different voltages. To obtain a highly sensitive biosensor, we show that the proposed structure has a full-width at half-maximum (FWHM) of 8.65 nm and a figure-of-merit (FOM) of 24.7 with a sensitivity of 213.3 nm/RI (refractive index) for the glucose solution. Our proposed device has potential for developing tunable biosensors for real-time health monitoring.

scholarly journals A Semi-Classical View on Epsilon-Near-Zero Resonant Tunneling Modes in Metal/Insulator/Metal Nanocavities

Nano Letters ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 3151-3160 ◽  
Author(s):  
Vincenzo Caligiuri ◽  
Milan Palei ◽  
Giulia Biffi ◽  
Sergey Artyukhin ◽  
Roman Krahne
Keyword(s):  
Resonant Tunneling ◽  
Metal Insulator ◽  
Classical View ◽  
Metal Insulator Metal ◽  
Epsilon Near Zero

Modeling, Fabrication, and Electrical Testing of Metal-Insulator-Metal Diode

2011 ◽  
Author(s):  
Terrance O'Regan ◽  
Matthew Chin ◽  
Cheng Tan ◽  
Anthony Birdwell
Keyword(s):  
Metal Insulator ◽  
Metal Insulator Metal

scholarly journals Hyperspectral Molecular Orientation Mapping in Metamaterials

2021 ◽  
Vol 11 (4) ◽  
pp. 1544
Author(s):  
Meguya Ryu ◽  
Yoshiaki Nishijima ◽  
Shinya Morimoto ◽  
Naoki To ◽  
Tomoki Hashizume ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Field Enhancement ◽  
Chemical Mapping ◽  
Metal Insulator ◽  
Orientation Mapping ◽  
Metal Insulator Metal ◽  
Finger Printing ◽  
Thermal Emitter ◽  
Ir Bands ◽  
Sub Wavelength

The four polarisation method is adopted for measurement of molecular orientation in dielectric nanolayers of metal-insulator-metal (MIM) metamaterials composed of gold nanodisks on polyimide and gold films. Hyperspectral mapping at the chemical finger printing spectral range of 4–20 μμm was carried out for MIM patterns of 1–2.5 μμm period (sub-wavelength). Overlay images taken at 0,π4,π2,3π4 orientation angles and subsequent baseline compensation are shown to be critically important for the interpretation of chemical mapping results and reduction of spurious artefacts. Light field enhancement in the 60-nm-thick polyimide (I in MIM) was responsible for strong absorption at the characteristic polyimide bands. Strong absorbance A at narrow IR bands can be used as a thermal emitter (emittance E=1−R), where R is the reflectance and A=1−R−T, where for optically thick samples the transmittance is T=0.

Nonstoichiometric Nanolayered Ni/NiO/Al2O3/CrAu Metal–Insulator–Metal Infrared Rectenna

2021 ◽  
Vol 4 (3) ◽  
pp. 2470-2475 ◽  
Author(s):  
Ayendra Weerakkody ◽  
Amina Belkadi ◽  
Garret Moddel
Keyword(s):  
Metal Insulator ◽  
Metal Insulator Metal

scholarly journals Design of a Liquid-Crystal-Tunable Terahertz Demultiplexer Based on a Metal-Insulator-Metal Waveguide

2019 ◽  
Vol 9 (4) ◽  
pp. 644
Author(s):  
Xue-Shi Li ◽  
Naixing Feng ◽  
Yuan-Mei Xu ◽  
Liang-Lun Cheng ◽  
Qing Liu
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Metal Insulator ◽  
Resonance Modes ◽  
External Bias ◽  
Bias Electric Field ◽  
Metal Waveguide ◽  
Metal Insulator Metal ◽  
Fabry Perot ◽  
Mim Waveguide

A tunable demultiplexer with three output channels infiltrated by liquid crystal (LC) is presented, which is based on a metal-insulator-metal (MIM) waveguide. The operating frequencies of the three output channels can be tuned simultaneously at will by changing the external bias electric field applied to the LC. By analyzing the Fabry-Pérot (FP) resonance modes of the finite-length MIM waveguide both theoretically and numerically, the locations of the three channels are delicately determined to achieve the best demultiplexing effects. Terahertz (THz) signals input from the main channel can be demultiplexed by channels 1, 2 and 3 at 0.7135 THz, 1.068 THz and 1.429 THz, respectively. By applying an external electric field to alter the tilt angle of the infiltrating LC material, the operating frequencies of channels 1, 2 and 3 can be relatively shifted up to 12.3%, 9.6% and 9.7%, respectively. The designed demultiplexer can not only provide a flexible means to demultiplex signals but also tune operating bands of output channels at the same time.

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