Lúcia Saito | Universidade Presbiteriana Mackenzie (original) (raw)

Papers by Lúcia Saito

Research paper thumbnail of Effects of Fog in Free-Space Optics Communication System

Frontiers in Optics 2017

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Research paper thumbnail of Mechanically exfoliated Rhenium disulfide onto D-shaped optical fiber for sub-300 fs EDFL mode-locking

Conference on Lasers and Electro-Optics

For the first time, we present the ultrashort pulse generation of sub 300-fs mode-locked Erbium d... more For the first time, we present the ultrashort pulse generation of sub 300-fs mode-locked Erbium doped fiber laser using mechanically exfoliated ReS2 deposited onto the polished surface of a D-shaped optical fiber.

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Research paper thumbnail of Hybrid mode-locked erbium fiber laser with a 40 GHz phase modulator and graphene saturable absorber

Frontiers in Optics / Laser Science

We report a hybrid mode-locked erbium fiber laser operating at 40 GHz using CVD monolayer graphen... more We report a hybrid mode-locked erbium fiber laser operating at 40 GHz using CVD monolayer graphene on a D-shaped fiber as saturable absorber. As result, we obtain ultrashort pulses with temporal width of 1 ps.

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Research paper thumbnail of Mechanically Exfoliated MoS2 onto D-shaped Optical Fiber for Erbium Doped Fiber Laser Mode-locking

Conference on Lasers and Electro-Optics

For the first time, we report an ultrashort pulse generation of 266 fs obtained by mode-locked Er... more For the first time, we report an ultrashort pulse generation of 266 fs obtained by mode-locked Erbium doped fiber laser using a mechanically exfoliated MoS2 deposited onto the side polished surface of D-shaped optical fiber.

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Research paper thumbnail of Graphene electro-absorption optical modulator design onto a D-shaped optical fiber

Frontiers in Optics 2017

We present the design of a graphene electro-optical modulator with a dielectric layer of Al2O3 bu... more We present the design of a graphene electro-optical modulator with a dielectric layer of Al2O3 built onto a D-shaped optical fiber. The all-fiber optical modulator is optimized by controlling the dielectric thickness, achieving >1GHz bandwidths.

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Research paper thumbnail of Ultrashort pulse generation performance in short and ultralong EDFL cavities using CVD monolayer graphene

Latin America Optics and Photonics Conference

We investigated ultrashort pulses generation in short and ultralong EDFL cavities using CVD monol... more We investigated ultrashort pulses generation in short and ultralong EDFL cavities using CVD monolayer graphene onto D shaped optical fiber as polarizer and saturable. The pulses duration performance was between 168 fs and 3.4 ps.

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Research paper thumbnail of Graphene Coplanar Capacitor for Electro-Optical Modulation

2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC)

We present an all-fiber graphene electroabsorption optical modulator built onto a side-polished o... more We present an all-fiber graphene electroabsorption optical modulator built onto a side-polished optical fiber in a coplanar capacitor configuration. For a maximum PMMA superstrate thickness of 1 µm and for a gap of 0.1 and 1 µm it was possible to obtain, respectively, a maximum modulation depth of 7.6 dB/mm and 5.3 dB/mm, a capacitance of 98.4 fF/mm and 63.1 fF/mm and frequencies of 16.2 GHz and 25.3 GHz. The contribution of this work is to demonstrate a low capacitance design with an optimized process fabrication for optical modulation.

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Research paper thumbnail of All-fiber graphene electro-optic modulators with different dielectric materials

2018 SBFoton International Optics and Photonics Conference (SBFoton IOPC)

We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a ... more We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a side-polished optical fiber using different dielectric materials such as aluminum oxide (Al2O3), hafnium oxide (HfO2) and hexagonal boron nitride (h-BN). Although HfO2 model resulted in a higher modulation depth with a thinner dielectric thickness, in the device comparison, h-BN and Al2O3 models can be operated by higher operating frequency limit. For a PMMA superstrate thickness of 100 and 700 nm, the analysis presents a modulation depth of 11.13 dB/mm and 12.42 dB/mm, drive voltage of 45.75 and 8.51 V and cutoff frequency of 3.75 and 0.76 GHz, respectively. Considering a required modulation depth, the h-BN thickness is 2.67 and 3.12 times smaller than required for Al2O3 modulator.

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Research paper thumbnail of Graphene-hBN optical modulator integrated in a polymer waveguide with 55 GHz bandwidth

Frontiers in Optics + Laser Science APS/DLS

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Research paper thumbnail of Graphene-based Capacitive Structures Fabrication for Optical Modulation Devices

Frontiers in Optics / Laser Science

This work presents the fabrication processes, for an embedded two CVD-grown single-layer graphene... more This work presents the fabrication processes, for an embedded two CVD-grown single-layer graphene based capacitive structure, with Al2O3 as a thin dielectric layer between them, aiming to act as an active medium for electro-optical modulators.

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Research paper thumbnail of All-fiber graphene electro-optical modulator with PMMA superstrate layer

Latin America Optics and Photonics Conference

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Research paper thumbnail of Patterning and Tuning the Electrical Conductivity of Graphene Oxide Films by Laser Scribing

Frontiers in Optics / Laser Science

We present a comparison of three laser setups for the photothermal production of reduced graphene... more We present a comparison of three laser setups for the photothermal production of reduced graphene oxide thin films on a nitrocellulose membrane. The lowest electrical resistance obtained was 800Ω, which is attractive for conductive applications.

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Research paper thumbnail of Highly Efficient Fermi Level Tunning in EO Waveguide Based on Double Layer Graphene Capacitor

2021 SBFoton International Optics and Photonics Conference (SBFoton IOPC)

In this work, we present the design of strongly confined optical mode embedded double-layer graph... more In this work, we present the design of strongly confined optical mode embedded double-layer graphene capacitor, based on Fermi level control. Considering the capacitor for the application of electrooptical modulator, our simulations considering a 250 nm PMMA as a superstrate and a silicon nitride waveguide with height = 200 nm and width = 2 µm resulted on 180 dB/mm extinction ratio. Furthermore, by analyzing the current and capacitance of our simulation we could better comprehend the electrical response of the modulator and its intrinsic nonlinearities.

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Research paper thumbnail of Amplificador Raman discreto para utilização em transmissão CWDM na banda O

A maior parte das pesquisas realizadas sobre amplificadores Raman tem seus estudos centrados nas ... more A maior parte das pesquisas realizadas sobre amplificadores Raman tem seus estudos centrados nas bandas C (1530 a 1565 nm) e L (1565 a 1625 nm), regioes onde os dados de eficiencia de ganho Raman e a parametrizacao dos amplificadores tem seus estudos consolidados. Um ponto importante para ser considerado quando se deseja trabalhar numa banda diferente, como no caso a banda O (1260 a 1360 nm), e que a alteracao nao e apenas no comprimento de onda do laser de bombeio. Deve-se considerar o decrescimo da area efetiva e do comprimento de onda que influenciara diretamente no valor da eficiencia e consequentemente no proprio ganho do amplificador Raman. Alguns amplificadores Raman utilizam a propria fibra de transmissao e outros tem como meio de amplificacao fibras especiais como DSF, DCF ou a propria fibra Raman como e demonstrado neste trabalho. Sabe-se, no entanto, que a amplificacao Raman pode ocorrer em qualquer banda do espectro optico sendo necessario para a sua montagem, apenas alt...

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Research paper thumbnail of Enhancing the electromagnetic interference shielding of flexible films with reduced graphene oxide-based coatings

Progress in Organic Coatings

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Research paper thumbnail of Graphene-based electro-optical modulators integrated into polymer waveguide with three dielectric materials proposals

2018 SBFoton International Optics and Photonics Conference (SBFoton IOPC)

This work presents an analysis of electro-optical modulators integrated into polymer waveguides, ... more This work presents an analysis of electro-optical modulators integrated into polymer waveguides, which operates over electro-absorption effect through graphene. This study focus in three different dielectric materials for the capacitive structure in the device such as silicon nitride, Si3N4, hafnium oxide, HfO2 and boron nitride, hBN. By varying the thickness of the dielectric material, it was possible to improve the extinction ratio, modulation frequency and reduce the switching voltages requirements. By considering a bottom cladding, it was possible to increase the light interaction with the graphene and obtain higher modulation frequencies. In the case of the device with HfO2, it was possible to obtain the highest extinction rate of 0.117 dB/μm with a dielectric thickness of 50 nm. For the model with the hBN thickness layer of 50 nm, the maximum operation frequency was 35 GHz, considering a device length of 27 μm. The condition with the minimum voltage requirements was obtained with HfO2, which the value switching was between 2.5 and 5 V. Although the results with Si3N4 are not the best, it is a good option when the device project try to match all the design requirements.

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Research paper thumbnail of Mechanically exfoliated Rhenium disulfide onto D-shaped optical fiber for sub-300 fs EDFL mode-locking

2018 Conference on Lasers and Electro-Optics (CLEO), 2018

For the first time, we present the ultrashort pulse generation of sub 300-fs mode-locked Erbium d... more For the first time, we present the ultrashort pulse generation of sub 300-fs mode-locked Erbium doped fiber laser using mechanically exfoliated ReS2 deposited onto the polished surface of a D-shaped optical fiber.

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Research paper thumbnail of Geração e propagação de pulsos em laser a fibra dopada comÉrbio com cavidades ultralongas

O laser de fibra dopada com Erbio e apresentado nesta tese numa nova configuracao: cavidade ultra... more O laser de fibra dopada com Erbio e apresentado nesta tese numa nova configuracao: cavidade ultralonga, com dimensao da ordem de dezenas de quilometros. Foram investigados os mecanismos responsaveis pela formacao e evolucao do pulso em cavidades com comprimentos de 16,4 m a 100,8 km operando em regime de acoplamento de modos ativo na taxa de repeticao de 1 GHz. A variacao da largura dos pulsos e da potencia de pico nestes lasers definem tres regimes de propagacao no interior das cavidades sendo possivel identificar os mecanismos responsaveis pela formacao e evolucao em cada um destes regimes, dependendo da relacao entre o comprimento da cavidade (Lcav) e o comprimento de dispersao (LD) e tambem em relacao ao comprimento nao-linear (LNL). Quando Lcav e menor que LD e LNL, nao ha efeito dispersivo e nao-linearidades apreciaveis na evolucao do pulso, obtendo-se aproximadamente 30 ps. Neste regime, a duracao final e determinada pela teoria de acoplamento de modos ativo. Para Lcav menor ...

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Research paper thumbnail of Ultrashort pulse generation performance in short and ultralong EDFL cavities using CVD monolayer graphene

We investigated ultrashort pulses generation in short and ultralong EDFL cavities using CVD monol... more We investigated ultrashort pulses generation in short and ultralong EDFL cavities using CVD monolayer graphene onto D shaped optical fiber as polarizer and saturable. The pulses duration performance was between 168 fs and 3.4 ps.

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Research paper thumbnail of All-fiber graphene electro-optic modulators with different dielectric materials

2018 SBFoton International Optics and Photonics Conference (SBFoton IOPC), 2018

We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a ... more We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a side-polished optical fiber using different dielectric materials such as aluminum oxide (Al2O3), hafnium oxide (HfO2) and hexagonal boron nitride (h-BN). Although HfO2 model resulted in a higher modulation depth with a thinner dielectric thickness, in the device comparison, h-BN and Al2O3 models can be operated by higher operating frequency limit. For a PMMA superstrate thickness of 100 and 700 nm, the analysis presents a modulation depth of 11.13 dB/mm and 12.42 dB/mm, drive voltage of 45.75 and 8.51 V and cutoff frequency of 3.75 and 0.76 GHz, respectively. Considering a required modulation depth, the h-BN thickness is 2.67 and 3.12 times smaller than required for Al2O3 modulator.

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Research paper thumbnail of Effects of Fog in Free-Space Optics Communication System

Frontiers in Optics 2017

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Research paper thumbnail of Mechanically exfoliated Rhenium disulfide onto D-shaped optical fiber for sub-300 fs EDFL mode-locking

Conference on Lasers and Electro-Optics

For the first time, we present the ultrashort pulse generation of sub 300-fs mode-locked Erbium d... more For the first time, we present the ultrashort pulse generation of sub 300-fs mode-locked Erbium doped fiber laser using mechanically exfoliated ReS2 deposited onto the polished surface of a D-shaped optical fiber.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Hybrid mode-locked erbium fiber laser with a 40 GHz phase modulator and graphene saturable absorber

Frontiers in Optics / Laser Science

We report a hybrid mode-locked erbium fiber laser operating at 40 GHz using CVD monolayer graphen... more We report a hybrid mode-locked erbium fiber laser operating at 40 GHz using CVD monolayer graphene on a D-shaped fiber as saturable absorber. As result, we obtain ultrashort pulses with temporal width of 1 ps.

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Research paper thumbnail of Mechanically Exfoliated MoS2 onto D-shaped Optical Fiber for Erbium Doped Fiber Laser Mode-locking

Conference on Lasers and Electro-Optics

For the first time, we report an ultrashort pulse generation of 266 fs obtained by mode-locked Er... more For the first time, we report an ultrashort pulse generation of 266 fs obtained by mode-locked Erbium doped fiber laser using a mechanically exfoliated MoS2 deposited onto the side polished surface of D-shaped optical fiber.

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Research paper thumbnail of Graphene electro-absorption optical modulator design onto a D-shaped optical fiber

Frontiers in Optics 2017

We present the design of a graphene electro-optical modulator with a dielectric layer of Al2O3 bu... more We present the design of a graphene electro-optical modulator with a dielectric layer of Al2O3 built onto a D-shaped optical fiber. The all-fiber optical modulator is optimized by controlling the dielectric thickness, achieving >1GHz bandwidths.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ultrashort pulse generation performance in short and ultralong EDFL cavities using CVD monolayer graphene

Latin America Optics and Photonics Conference

We investigated ultrashort pulses generation in short and ultralong EDFL cavities using CVD monol... more We investigated ultrashort pulses generation in short and ultralong EDFL cavities using CVD monolayer graphene onto D shaped optical fiber as polarizer and saturable. The pulses duration performance was between 168 fs and 3.4 ps.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Graphene Coplanar Capacitor for Electro-Optical Modulation

2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC)

We present an all-fiber graphene electroabsorption optical modulator built onto a side-polished o... more We present an all-fiber graphene electroabsorption optical modulator built onto a side-polished optical fiber in a coplanar capacitor configuration. For a maximum PMMA superstrate thickness of 1 µm and for a gap of 0.1 and 1 µm it was possible to obtain, respectively, a maximum modulation depth of 7.6 dB/mm and 5.3 dB/mm, a capacitance of 98.4 fF/mm and 63.1 fF/mm and frequencies of 16.2 GHz and 25.3 GHz. The contribution of this work is to demonstrate a low capacitance design with an optimized process fabrication for optical modulation.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of All-fiber graphene electro-optic modulators with different dielectric materials

2018 SBFoton International Optics and Photonics Conference (SBFoton IOPC)

We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a ... more We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a side-polished optical fiber using different dielectric materials such as aluminum oxide (Al2O3), hafnium oxide (HfO2) and hexagonal boron nitride (h-BN). Although HfO2 model resulted in a higher modulation depth with a thinner dielectric thickness, in the device comparison, h-BN and Al2O3 models can be operated by higher operating frequency limit. For a PMMA superstrate thickness of 100 and 700 nm, the analysis presents a modulation depth of 11.13 dB/mm and 12.42 dB/mm, drive voltage of 45.75 and 8.51 V and cutoff frequency of 3.75 and 0.76 GHz, respectively. Considering a required modulation depth, the h-BN thickness is 2.67 and 3.12 times smaller than required for Al2O3 modulator.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Graphene-hBN optical modulator integrated in a polymer waveguide with 55 GHz bandwidth

Frontiers in Optics + Laser Science APS/DLS

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Research paper thumbnail of Graphene-based Capacitive Structures Fabrication for Optical Modulation Devices

Frontiers in Optics / Laser Science

This work presents the fabrication processes, for an embedded two CVD-grown single-layer graphene... more This work presents the fabrication processes, for an embedded two CVD-grown single-layer graphene based capacitive structure, with Al2O3 as a thin dielectric layer between them, aiming to act as an active medium for electro-optical modulators.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of All-fiber graphene electro-optical modulator with PMMA superstrate layer

Latin America Optics and Photonics Conference

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Research paper thumbnail of Patterning and Tuning the Electrical Conductivity of Graphene Oxide Films by Laser Scribing

Frontiers in Optics / Laser Science

We present a comparison of three laser setups for the photothermal production of reduced graphene... more We present a comparison of three laser setups for the photothermal production of reduced graphene oxide thin films on a nitrocellulose membrane. The lowest electrical resistance obtained was 800Ω, which is attractive for conductive applications.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Highly Efficient Fermi Level Tunning in EO Waveguide Based on Double Layer Graphene Capacitor

2021 SBFoton International Optics and Photonics Conference (SBFoton IOPC)

In this work, we present the design of strongly confined optical mode embedded double-layer graph... more In this work, we present the design of strongly confined optical mode embedded double-layer graphene capacitor, based on Fermi level control. Considering the capacitor for the application of electrooptical modulator, our simulations considering a 250 nm PMMA as a superstrate and a silicon nitride waveguide with height = 200 nm and width = 2 µm resulted on 180 dB/mm extinction ratio. Furthermore, by analyzing the current and capacitance of our simulation we could better comprehend the electrical response of the modulator and its intrinsic nonlinearities.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Amplificador Raman discreto para utilização em transmissão CWDM na banda O

A maior parte das pesquisas realizadas sobre amplificadores Raman tem seus estudos centrados nas ... more A maior parte das pesquisas realizadas sobre amplificadores Raman tem seus estudos centrados nas bandas C (1530 a 1565 nm) e L (1565 a 1625 nm), regioes onde os dados de eficiencia de ganho Raman e a parametrizacao dos amplificadores tem seus estudos consolidados. Um ponto importante para ser considerado quando se deseja trabalhar numa banda diferente, como no caso a banda O (1260 a 1360 nm), e que a alteracao nao e apenas no comprimento de onda do laser de bombeio. Deve-se considerar o decrescimo da area efetiva e do comprimento de onda que influenciara diretamente no valor da eficiencia e consequentemente no proprio ganho do amplificador Raman. Alguns amplificadores Raman utilizam a propria fibra de transmissao e outros tem como meio de amplificacao fibras especiais como DSF, DCF ou a propria fibra Raman como e demonstrado neste trabalho. Sabe-se, no entanto, que a amplificacao Raman pode ocorrer em qualquer banda do espectro optico sendo necessario para a sua montagem, apenas alt...

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Research paper thumbnail of Enhancing the electromagnetic interference shielding of flexible films with reduced graphene oxide-based coatings

Progress in Organic Coatings

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Research paper thumbnail of Graphene-based electro-optical modulators integrated into polymer waveguide with three dielectric materials proposals

2018 SBFoton International Optics and Photonics Conference (SBFoton IOPC)

This work presents an analysis of electro-optical modulators integrated into polymer waveguides, ... more This work presents an analysis of electro-optical modulators integrated into polymer waveguides, which operates over electro-absorption effect through graphene. This study focus in three different dielectric materials for the capacitive structure in the device such as silicon nitride, Si3N4, hafnium oxide, HfO2 and boron nitride, hBN. By varying the thickness of the dielectric material, it was possible to improve the extinction ratio, modulation frequency and reduce the switching voltages requirements. By considering a bottom cladding, it was possible to increase the light interaction with the graphene and obtain higher modulation frequencies. In the case of the device with HfO2, it was possible to obtain the highest extinction rate of 0.117 dB/μm with a dielectric thickness of 50 nm. For the model with the hBN thickness layer of 50 nm, the maximum operation frequency was 35 GHz, considering a device length of 27 μm. The condition with the minimum voltage requirements was obtained with HfO2, which the value switching was between 2.5 and 5 V. Although the results with Si3N4 are not the best, it is a good option when the device project try to match all the design requirements.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Mechanically exfoliated Rhenium disulfide onto D-shaped optical fiber for sub-300 fs EDFL mode-locking

2018 Conference on Lasers and Electro-Optics (CLEO), 2018

For the first time, we present the ultrashort pulse generation of sub 300-fs mode-locked Erbium d... more For the first time, we present the ultrashort pulse generation of sub 300-fs mode-locked Erbium doped fiber laser using mechanically exfoliated ReS2 deposited onto the polished surface of a D-shaped optical fiber.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Geração e propagação de pulsos em laser a fibra dopada comÉrbio com cavidades ultralongas

O laser de fibra dopada com Erbio e apresentado nesta tese numa nova configuracao: cavidade ultra... more O laser de fibra dopada com Erbio e apresentado nesta tese numa nova configuracao: cavidade ultralonga, com dimensao da ordem de dezenas de quilometros. Foram investigados os mecanismos responsaveis pela formacao e evolucao do pulso em cavidades com comprimentos de 16,4 m a 100,8 km operando em regime de acoplamento de modos ativo na taxa de repeticao de 1 GHz. A variacao da largura dos pulsos e da potencia de pico nestes lasers definem tres regimes de propagacao no interior das cavidades sendo possivel identificar os mecanismos responsaveis pela formacao e evolucao em cada um destes regimes, dependendo da relacao entre o comprimento da cavidade (Lcav) e o comprimento de dispersao (LD) e tambem em relacao ao comprimento nao-linear (LNL). Quando Lcav e menor que LD e LNL, nao ha efeito dispersivo e nao-linearidades apreciaveis na evolucao do pulso, obtendo-se aproximadamente 30 ps. Neste regime, a duracao final e determinada pela teoria de acoplamento de modos ativo. Para Lcav menor ...

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Research paper thumbnail of Ultrashort pulse generation performance in short and ultralong EDFL cavities using CVD monolayer graphene

We investigated ultrashort pulses generation in short and ultralong EDFL cavities using CVD monol... more We investigated ultrashort pulses generation in short and ultralong EDFL cavities using CVD monolayer graphene onto D shaped optical fiber as polarizer and saturable. The pulses duration performance was between 168 fs and 3.4 ps.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of All-fiber graphene electro-optic modulators with different dielectric materials

2018 SBFoton International Optics and Photonics Conference (SBFoton IOPC), 2018

We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a ... more We present a comparison of all-fiber graphene electro-absorption optical modulators built onto a side-polished optical fiber using different dielectric materials such as aluminum oxide (Al2O3), hafnium oxide (HfO2) and hexagonal boron nitride (h-BN). Although HfO2 model resulted in a higher modulation depth with a thinner dielectric thickness, in the device comparison, h-BN and Al2O3 models can be operated by higher operating frequency limit. For a PMMA superstrate thickness of 100 and 700 nm, the analysis presents a modulation depth of 11.13 dB/mm and 12.42 dB/mm, drive voltage of 45.75 and 8.51 V and cutoff frequency of 3.75 and 0.76 GHz, respectively. Considering a required modulation depth, the h-BN thickness is 2.67 and 3.12 times smaller than required for Al2O3 modulator.

Bookmarks Related papers MentionsView impact