AOMatDev 2024 Abstracts

Area 1 - Advanced Optical Materials and Devices

Nr:	52
Title:	Unlocking The Potential of OAM Devices in Optical Communications
Authors:	Temitope M. Olaleye, Paulo A. Ribeiro and Maria Raposo
Abstract:	The versatility of orbital angular momentum (OAM) devices is seen in diverse applications, from optical communication to quantum information processing and imaging. Each device plays a unique role in harnessing the advantages of orbital angular momentum in the manipulation and transmission of light. This work explores the potential of OAM devices in optical communications, focusing on OAM-based multiplexers and demultiplexers. The devices are designed to multiplex and demultiplex signals encoded with different OAM states, allowing for the simultaneous transmission of multiple data streams through a single channel. This plays a crucial role in significantly increasing channel capacity by encoding information in the traditional dimensions of polarization and wavelength and the orbital angular momentum domain. We emphasized the importance of meeting the escalating bandwidth demands of modern telecommunications, and we see how OAM devices can open new dimensions for enhancing communication channel capacity. By leveraging the spatial degrees of freedom in OAM, these devices revolutionize data transfer through multiplexing, addressing challenges posed by conventional communication channels.

Nr:	55
Title:	Effect of UVC Light and the Presence of Catechin Molecules on Graphene Oxide Thin Films for Optical Devices
Authors:	Valentina A. Burgos, Tiago Reis, Susana Sério, Maria H. Fino, Paulo A. Ribeiro, Katherina Fernandez and Maria Raposo
Abstract:	Graphene oxide (GO) thin films are being used in different kinds of electric and optical devices. Recently, we demonstrated that in graphene oxide-based solar cells, the graphene oxide is reduced when subjected to a light spot. In this work, we analyzed the kinetics of irradiation of GO thin films and aqueous solutions with UVC light to understand the reduction processes during the irradiation. As catechin molecules have been used to protect molecules from irradiation, catechin molecules were added to thin films and solutions. The thin films and solutions were characterized by ultraviolet-visible and impedance spectroscopies. Results demonstrated that both GO thin films and solutions are strongly affected by UVC light with consequent reduction of the GO, while the presence of catechin molecules decreases the GO reduction effects. These results allow us to conclude that light has a strong effect on the GO reduction and catechin molecules should be introduced in the thin films to avoid GO reduction if this is important for the development of GO devices.

Short Papers

Paper Nr:	5
Title:	Investigation of Lossy Mode Resonance Phenomenon in High Index Cladding Optical Fiber
Authors:	Sukanya Choudhary, Flavio Esposito, Stefania Campopiano and Agostino Iadicicco
Abstract:	Here, we report the novelty of inducing the lossy mode resonance (LMR) phenomena without usage of any additional coating onto the fiber device. Instead, a high refractive index cladding (HIC) optical fiber is utilized, eliminating the need for additional coatings. This kind of optical fiber has a cladding whose refractive index is higher than the core. The outer cladding with high refractive index permits the generation of lossy modes, a key component of the LMR phenomenon. The diameter of the fiber is modified through chemical etching. This modification serves as a tuning mechanism for the LMR phenomenon, influencing the number of modes guided, order of mode, and resonant wavelength of LMR bands. The developed device is noted for its simplicity and cost-effectiveness. The sensor exhibits a maximum sensitivity of 1700 nm/RIU to surrounding refractive index (SRI) around region of water refractive index. The higher sensitivity and simplification of the device make it suitable for applications in biological and chemical sensing.
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Paper Nr:	6
Title:	Localized Surface Plasmon Resonance on Optical Fiber Surface for Chemical Sensing
Authors:	Amin Moslemi, Lucia Sansone, Flavio Esposito, Stefania Campopiano, Michele Giordano and Agostino Iadicicco
Abstract:	This study describes the basic principles of a fiber optic probe that exploits the localized surface plasmon resonance (LSPR) effect achieved by depositing gold nanoparticles (AuNPs) onto the fiber optic transducer. The idea is to read the absorbance spectra of AuNPs and its dependence on the environmental parameter, i.e. the surrounding refractive index, using optical fiber. Basically, we selected a thin optical fiber to encourage the presence of evanescent waves in the surrounding medium; furthermore, the fiber surface has been functionalized allowing the grafting of AuNPs while a silver mirror on the fiber tip allows readout for reflection configuration. The reflected spectra show absorbance characteristics related to single and aggregated AuNPs. In this article, the peaks absorbance, i.e. the depths of the reflected signal, were studied as a function of the surrounding refractive index for application in chemical sensing.
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