Electrically tunable, plasmon resonance enhanced, terahertz third harmonic generation via graphene

RSC Advances ◽  
2016 ◽  
Vol 6 (55) ◽  
pp. 50190-50200 ◽  
Author(s):  
H. Nasari ◽  
M. S. Abrishamian

In this study, we demonstrate how field enhancement due to plasmonic resonances can noticeably improve the efficiency of third harmonic generation (THG) from graphene sheets on a grating substrate under normal illumination of terahertz (THz) waves.

Author(s):  
Jian Wei You ◽  
Jie You ◽  
Martin Weismann ◽  
Nicolae C. Panoiu

Intriguing and unusual physical properties of graphene offer remarkable potential for advanced, photonics-related technological applications, particularly in the area of nonlinear optics at the deep-subwavelength scale. In this study, we use a recently developed numerical method to illustrate an efficient mechanism that can lead to orders of magnitude enhancement of the third-harmonic generation in graphene diffraction gratings. In particular, we demonstrate that by taking advantage of the geometry dependence of the resonance wavelength of localized surface-plasmon polaritons of graphene ribbons and discs one can engineer the spectral response of graphene gratings so that strong plasmonic resonances exist at both the fundamental frequency and third-harmonic (TH). As a result of this double-resonant mechanism for optical near-field enhancement, the intensity of the TH can be increased by more than six orders of magnitude. This article is part of the themed issue ‘New horizons for nanophotonics’.


Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3194
Author(s):  
Adrian Petris ◽  
Petronela Gheorghe ◽  
Tudor Braniste ◽  
Ion Tiginyanu

The ultrafast third-order optical nonlinearity of c-plane GaN crystal, excited by ultrashort (fs) high-repetition-rate laser pulses at 1550 nm, wavelength important for optical communications, is investigated for the first time by optical third-harmonic generation in non-phase-matching conditions. As the thermo-optic effect that can arise in the sample by cumulative thermal effects induced by high-repetition-rate laser pulses cannot be responsible for the third-harmonic generation, the ultrafast nonlinear optical effect of solely electronic origin is the only one involved in this process. The third-order nonlinear optical susceptibility of GaN crystal responsible for the third-harmonic generation process, an important indicative parameter for the potential use of this material in ultrafast photonic functionalities, is determined.


2021 ◽  
Vol 1859 (1) ◽  
pp. 012050
Author(s):  
Z Kasapeteva ◽  
A Dakova ◽  
V Slavchev ◽  
D Dakova ◽  
L Kovachev ◽  
...  

APL Photonics ◽  
2016 ◽  
Vol 1 (9) ◽  
pp. 091303
Author(s):  
J. Trägårdh ◽  
J. Schniete ◽  
M. Parsons ◽  
G. McConnell

1994 ◽  
Vol 23 (5) ◽  
pp. 913-914 ◽  
Author(s):  
Takakazu Yamamoto ◽  
Kenichi Kizu ◽  
Tsukasa Maruyama ◽  
Naoki Ooba ◽  
Satoru Tomaru ◽  
...  

2014 ◽  
Vol 2 (12) ◽  
pp. 1121-1121 ◽  
Author(s):  
Gui Xin Li ◽  
Shu Mei Chen ◽  
Yuan Cai ◽  
Shuang Zhang ◽  
Kok Wai Cheah

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