Optical filters using bends of optical waveguides

Chip-scale integrated optical devices are one of the most developed research subjects in last years. These devices serve as a bridge to overcome size mismatch between diffraction-limited bulk optics and nanoscale photonic devices. They have been employed to develop many on-chip applications, such as integrated light sources, polarizers, optical filters, and even biosensing devices. Among these integrated systems can be found the so-called hybrid photonic-plasmonic devices, structures that integrate plasmonic metamaterials on top of optical waveguides, leading to outstanding physical phenomena. In this contribution, we present a comprehensive study of the design of hybrid photonic-plasmonic systems consisting of periodic arrays of metallic nanowires integrated on top of dielectric waveguides. Based on numerical simulations, we explain the physics of these structures and analyze light coupling between plasmonic resonances in the nanowires and the photonic modes of the waveguides below them. With this chapter we pretend to attract the interest of research community in the development of integrated hybrid photonic-plasmonic devices, especially light interaction between guided photonic modes and plasmonic resonances in metallic nanowires.

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Photonic Filters Using Optical Retarders Based on Birefringent Optical Media

Revista de Ciencias ◽

10.25100/rc.v19i2.6273 ◽

2018 ◽

Vol 19 (2) ◽

pp. 6

Author(s):

Joel Santos Aguilar ◽

Celso Guti´´errez Martínez

Keyword(s):

Optical Waveguides ◽

Laser Diodes ◽

Wide Band ◽

Optical Filters ◽

Linbo3 Crystal ◽

Multimode Laser ◽

Light Emitting ◽

Optical Media ◽

Polarization Maintaining Fiber ◽

Polarization Maintaining

Photonic filters can be used for filtering the spectrum of wide-band optical sources such as light emitting diodes (LED) or multimode laser diodes(MMLD). In this work the use of birefringen optical media such as polarization maintaining fiber (PMF) or birefringent optical waveguides on Lithium Niobate (LiNbO3) crystal, perform as optical filters.

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Property Control Of New Fluorinated Copolyimides And Their Applications

MRS Proceedings ◽

10.1557/proc-227-49 ◽

1991 ◽

Vol 227 ◽

Cited By ~ 10

Author(s):

S. Sasaki ◽

T. Matsuura ◽

S. Nishi ◽

S. Ando

Keyword(s):

Refractive Index ◽

Thermal Expansion ◽

Thermal Expansion Coefficient ◽

Expansion Coefficient ◽

Optical Waveguides ◽

Fluorine Content ◽

Optical Filters ◽

Optical Transparency ◽

Low Thermal Expansion ◽

Property Control

ABSTRACTNew fluorinated copolyimides are synthesized with 2,2′-bis(trifluoromethyl)-4,4′- diaminobiphenyl (TFDB) and a mixture of 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and pyromellitic dianhydride (PMDA). The thermal expansion coefficient decreases with decreasing 6FDA content, because the hexafluoroisopropylidene group makes the main chain flexible. The refractive index decreases with increasing 6FDA content, because the fluorine content increases. The thermal expansion coefficient can be controlled between -0.5 × 10−5 and 8×10−5 /°C, and the refractive index can be controlled between 1.556 and 1.647 at 589.3 nm, by changing the 6FDA content. The polyimides and copolyimides from TFDB can be used in optical filters because of their high optical transparency and low thermal expansion coefficient. They are expected to be used in optical waveguides because of their high optical transparency and refractive index control.

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TEM characterization of proton-exchanged LiNbO3 optical waveguides

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010014395x ◽

1986 ◽

Vol 44 ◽

pp. 480-481

Author(s):

W. E. Lee

Keyword(s):

Refractive Index ◽

Benzoic Acid ◽

Optical Waveguides ◽

Total Internal Reflection ◽

Index Of Refraction ◽

Optical Measurements ◽

Lithium Ions ◽

Wide Channel ◽

Tem Characterization

An optical waveguide consists of a several-micron wide channel with a slightly different index of refraction than the host substrate; light can be trapped in the channel by total internal reflection.Optical waveguides can be formed from single-crystal LiNbO3 using the proton exhange technique. In this technique, polished specimens are masked with polycrystal1ine chromium in such a way as to leave 3-13 μm wide channels. These are held in benzoic acid at 249°C for 5 minutes allowing protons to exchange for lithium ions within the channels causing an increase in the refractive index of the channel and creating the waveguide. Unfortunately, optical measurements often reveal a loss in waveguiding ability up to several weeks after exchange.

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