The measurement of refractive index profile and aberration of radial gradient index lens by using imaging method

2004 ◽  
Vol 36 (2) ◽  
pp. 163-166 ◽  
Author(s):  
Xiaohong Sun ◽  
Hui Ma ◽  
Hai Ming ◽  
Zhiqiang Zheng ◽  
Jiwen Yang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Refractive Index Profile ◽  
Imaging Method ◽  
Gradient Index ◽  
Index Profile ◽  
Radial Gradient ◽  
Gradient Index Lens

Fabrication Applications of GRIN Materials

2012 ◽  
Vol 586 ◽  
pp. 215-220 ◽  
Author(s):  
Yu Lin Li ◽  
Bao Wen Hu ◽  
Zheng Quan He ◽  
Min Rui Zhang ◽  
Jun Min Huo ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Materials ◽  
Optical Glass ◽  
Refractive Index Profile ◽  
Gradient Index ◽  
Index Profile ◽  
Medical Endoscope ◽  
Exchange Method ◽  
Fiber Communications ◽  
Ion Exchange Method

In recent years, a series of gradient index (GRIN) materials including Optical glass and polymer have been Research and developed in our laboratory. The Micro-lenses and arrays with the special optical materials also have been fabricated mainly by using Ion-exchange method through refractive index profile, which are applied to micro-optic devices and other applications—— especially in the coupled and connected devices for fiber communications and medical endoscope or they are used primarily for document scanning equipments.

scholarly journals Passive discrete lens for broadband elastic guided wave focusing

2021 ◽  
Author(s):  
Emeline Sadoulet-Reboul ◽  
Gaël Matten ◽  
Kaijun Yi ◽  
Morvan Ouisse
Keyword(s):  
Refractive Index ◽  
Elastic Wave ◽  
Health Monitoring ◽  
Focal Point ◽  
Refractive Index Profile ◽  
Guided Wave ◽  
Gradient Index ◽  
Frequency Range ◽  
Index Profile ◽  
Wave Focusing

Elastic guided wave focusing is of great interest for applications such as vibroacoustic control, energy harvesting, or Structural Health Monitoring. Different strategies allow generation of this effect, GRadient-INdex devices in particular exploit medium with varying properties such as thickness to reproduce an adequate refractive index profile as in optics. The resulting continuous profiles have a curved geometry that can be hard to manufacture, and be difficult to integrate in a given design. The purpose of this paper is to propose a discrete design for a GRIN lens. It is composed of segments selected in number and thickness to give similar focusing effects as a continuous lens profile. The identified configuration is manufactured and bounded on an aluminium plate to evaluate the effective focusing performances. Numerical and experimental vibrometry results confirm that the proposed lens exhibits a fixed focal point over a broad frequency range. The discrete design overcomes fabrication issues encountered in continuous design, allowing for an easier integration in devices for elastic wave control.

scholarly journals Influence of Rugate Filters on the Spectral Manifestation of Tamm Plasmon Polaritons

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1282
Author(s):  
Victor Reshetnyak ◽  
Igor Pinkevych ◽  
Timothy Bunning ◽  
Dean Evans
Keyword(s):  
Refractive Index ◽  
Band Gap ◽  
External Medium ◽  
Metal Layer ◽  
Refractive Index Profile ◽  
Spectral Position ◽  
Index Profile ◽  
Reflection And Transmission ◽  
Rugate Filter ◽  
Plasmon Polaritons

This study theoretically investigated light reflection and transmission in a system composed of a thin metal layer (Ag) adjacent to a rugate filter (RF) having a harmonic refractive index profile. Narrow dips in reflectance and peaks in transmittance in the RF band gap were obtained due to the excitation of a Tamm plasmon polariton (TPP) at the Ag–RF interface. It is shown that the spectral position and magnitude of the TPP dips/peaks in the RF band gap depend on the harmonic profile parameters of the RF refractive index, the metal layer thickness, and the external medium refractive index. The obtained dependences for reflectance and transmittance allow selecting parameters of the system which can be optimized for various applications.

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