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Jhonattan C. Ramirez

As seen in: ACS Publications, Optica
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Articles by Jhonattan C. Ramirez

Design and Experimental Demonstration of Pyramidal SERS Substrates with High-Throughput Fabrication Method

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By Fabiano C. Santana, Yuri H. Isayama, Rafael S. Gonçalves, Jhonattan C. Ramirez
| ACS Publications
Introduction Click to copy section linkSection link copied! Raman spectroscopy is a cutting-edge analytical technique that has had a major impact in a wide variety of fields, among which one can cite: chemistry and biology, (1−5) materials science, (6,7) pharmaceutical and medical, (8,9) and food industries. (10,11) Its ability to provide rapid and label-free identification with specificity down to the molecular level has made it a powerful asset in nanoscale characterization processes.
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Electro-optical properties of a graphene device on a tip-enhanced Raman spectroscopy system

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By Jhonattan C. Ramirez, Ado Jorio, Departamento de Física, Rafael Nadas
| Optica Verified
This paper investigates the impact of graphene on tip-enhanced Raman spectroscopy (TERS) by developing an electromagnetic characterization of the TERS-graphene device system. The study focuses on the interaction between the tip, the gate voltage, and the sample, specifically examining the electromagnetic effects in the system.
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Complementary photonic crystal integrated logic devices

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By Luis Caballero, Michelle Povinelli, Jhonattan C. Ramirez
| osapublishing.org
Abstract We theoretically propose and demonstrate through numerous simulations complementary photonic crystal integrated logic (CPCL) devices. Simulation results provide demonstration of a highly efficient clock rate, higher than 20 GHz, guaranteeing operation at both input and output with the same wavelength (around $\lambda = 1550\;{\rm nm} $). The proposed devices show well-defined output power values representing the two logic states 1 and 0, with a contrast ratio as high as 6 dB.
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