Second harmonic generation from GaAs-Au subwavelength relief gratings
We study numerically the second-harmonic generation (SHG) from subwavelength GaAs relief gratings with and without Au nano-stripes on the bottom of grating troughs. The SHG efficiency is calculated by finite element method as a function of grating amplitude, Au-stripes thickness, depth of trough for...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-06-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379722002571 |
| _version_ | 1828365792957169664 |
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| author | C.J. Valencia-Caicedo E.I. Chaikina A.V. Khomenko |
| author_facet | C.J. Valencia-Caicedo E.I. Chaikina A.V. Khomenko |
| author_sort | C.J. Valencia-Caicedo |
| collection | DOAJ |
| description | We study numerically the second-harmonic generation (SHG) from subwavelength GaAs relief gratings with and without Au nano-stripes on the bottom of grating troughs. The SHG efficiency is calculated by finite element method as a function of grating amplitude, Au-stripes thickness, depth of trough for TE and TM polarized fundamental harmonic. Our results show that a deep subwavelength grating without Au stripes can be considered as a homogeneous film when the grating period is 3.5 times shorter than the wavelength. Such a grating with a certain amplitude enhances the SHG efficiency by about 20 times compared with the efficiency of a crystal with flat surface. The Au-stripes at the grating troughs significantly increase the electromagnetic field concentration in the crystal ridges of the grating due to plasmonic resonance. In this case, the SHG efficiency enhancement is more than 500 times, while the absolute value of SHG efficiency reaches 1.2 × 10−3% when the intensity of pump light is 1 GW/cm2. |
| first_indexed | 2024-04-14T05:35:43Z |
| format | Article |
| id | doaj.art-94ff50e6f4074fca86653af32d037057 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-04-14T05:35:43Z |
| publishDate | 2022-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-94ff50e6f4074fca86653af32d0370572022-12-22T02:09:39ZengElsevierResults in Physics2211-37972022-06-0137105516Second harmonic generation from GaAs-Au subwavelength relief gratingsC.J. Valencia-Caicedo0E.I. Chaikina1A.V. Khomenko2Corresponding author.; Optics Department, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Carretera Tijuana-Ensenada 3918, 22860, Ensenada, BC, MexicoOptics Department, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Carretera Tijuana-Ensenada 3918, 22860, Ensenada, BC, MexicoOptics Department, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Carretera Tijuana-Ensenada 3918, 22860, Ensenada, BC, MexicoWe study numerically the second-harmonic generation (SHG) from subwavelength GaAs relief gratings with and without Au nano-stripes on the bottom of grating troughs. The SHG efficiency is calculated by finite element method as a function of grating amplitude, Au-stripes thickness, depth of trough for TE and TM polarized fundamental harmonic. Our results show that a deep subwavelength grating without Au stripes can be considered as a homogeneous film when the grating period is 3.5 times shorter than the wavelength. Such a grating with a certain amplitude enhances the SHG efficiency by about 20 times compared with the efficiency of a crystal with flat surface. The Au-stripes at the grating troughs significantly increase the electromagnetic field concentration in the crystal ridges of the grating due to plasmonic resonance. In this case, the SHG efficiency enhancement is more than 500 times, while the absolute value of SHG efficiency reaches 1.2 × 10−3% when the intensity of pump light is 1 GW/cm2.http://www.sciencedirect.com/science/article/pii/S2211379722002571Second-harmonic generationNonlinear opticsPlasmonicsSemiconductor nonlinear opticsSubwavelength grating |
| spellingShingle | C.J. Valencia-Caicedo E.I. Chaikina A.V. Khomenko Second harmonic generation from GaAs-Au subwavelength relief gratings Results in Physics Second-harmonic generation Nonlinear optics Plasmonics Semiconductor nonlinear optics Subwavelength grating |
| title | Second harmonic generation from GaAs-Au subwavelength relief gratings |
| title_full | Second harmonic generation from GaAs-Au subwavelength relief gratings |
| title_fullStr | Second harmonic generation from GaAs-Au subwavelength relief gratings |
| title_full_unstemmed | Second harmonic generation from GaAs-Au subwavelength relief gratings |
| title_short | Second harmonic generation from GaAs-Au subwavelength relief gratings |
| title_sort | second harmonic generation from gaas au subwavelength relief gratings |
| topic | Second-harmonic generation Nonlinear optics Plasmonics Semiconductor nonlinear optics Subwavelength grating |
| url | http://www.sciencedirect.com/science/article/pii/S2211379722002571 |
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