scholarly journals High Quality Factor Silicon Membrane Metasurface for Intensity-Based Refractive Index Sensing

Optics ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 193-199
Author(s):  
Andrea Tognazzi ◽  
Davide Rocco ◽  
Marco Gandolfi ◽  
Andrea Locatelli ◽  
Luca Carletti ◽  
...  
Keyword(s):  
Refractive Index ◽  
Quality Factor ◽  
Refractive Index Change ◽  
Periodic Array ◽  
Silicon Membrane ◽  
High Quality ◽  
Index Change ◽  
Sensing Mechanism ◽  
Refractive Index Sensing ◽  
All Optical

We propose a new sensing device based on all-optical nano-objects placed in a suspended periodic array. We demonstrate that the intensity-based sensing mechanism can measure environment refractive index change of the order of 1.8×10−6, which is close to record efficiencies in plasmonic devices.

High-quality-factor multiple Fano resonances for refractive index sensing

2018 ◽  
Vol 43 (8) ◽  
pp. 1842 ◽  
Author(s):  
Yuebian Zhang ◽  
Wenwei Liu ◽  
Zhancheng Li ◽  
Zhi Li ◽  
Hua Cheng ◽  
...  
Keyword(s):  
Refractive Index ◽  
Quality Factor ◽  
High Quality Factor ◽  
Fano Resonances ◽  
High Quality ◽  
Refractive Index Sensing

scholarly journals High quality factor photonic crystal filter at k ≈0 and its application for refractive index sensing

2017 ◽  
Vol 25 (9) ◽  
pp. 10536 ◽  
Author(s):  
Yonghao Liu ◽  
Shuling Wang ◽  
Deyin Zhao ◽  
Weidong Zhou ◽  
Yuze Sun
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Quality Factor ◽  
High Quality Factor ◽  
High Quality ◽  
Refractive Index Sensing

DFB Waveguide All-Optical Switching Devices Employing Pump-Induced Refractive Index Change in GaInAsP

2007 ◽  
Vol 31 ◽  
pp. 206-208 ◽  
Author(s):  
Tetsuya Mizumoto ◽  
Yoichi Akano ◽  
Kazuhiko Tamura ◽  
Masaki Yoshimura
Keyword(s):  
Refractive Index ◽  
Optical Switching ◽  
Refractive Index Change ◽  
Distributed Feedback ◽  
Temporal Response ◽  
Index Change ◽  
All Optical ◽  
Optical Switching Devices ◽  
All Optical Switching ◽  
Switching Devices

A pump-induced refractive index change was measured in a passive GaInAsP waveguide together with its temporal response. Also, the temporal response of distributed feedback (DFB) waveguide transmittance modulated by the pump-induced index change was experimentally investigated for an application to all-optical switching devices.

scholarly journals All-optical switching using a new photonic crystal directional coupler

2015 ◽  
Vol 4 (1) ◽  
pp. 63 ◽  
Author(s):  
B. Vakili ◽  
S. Bahadori-Haghighi ◽  
R. Ghayour
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Communication Systems ◽  
Optical Switching ◽  
Directional Coupler ◽  
Refractive Index Change ◽  
Control Signal ◽  
Index Change ◽  
All Optical ◽  
All Optical Switching

In this paper all-optical switching in a new photonic crystal directional coupler is performed.  The structure of the switch consists of a directional coupler and a separate path for a control signal called “control waveguide”. In contrast to the former reported structures in which the directional couplers are made by removing a row of rods entirely, the directional coupler in our optical switch is constructed by two reduced-radius line-defect waveguides separated by the control waveguide. Furthermore, in our case the background material has the nonlinear Kerr property. Therefore, in the structure of this work, no frequency overlap occurs between the control waveguide mode and the directional coupler modes. It is shown that such a condition provides a very good isolation between the control and the probe signals at the output ports. In the control waveguide, nonlinear Kerr effect causes the required refractive index change by the presence of a high power control (pump) signal. Even and odd modes of the coupler are investigated by applying the distribution of the refractive index change in the nonlinear region of a super-cell so that a switching length of about 94 µm is obtained at the wavelength of 1.55 µm. Finally, all-optical switching of the 1.55 µm probe signal using a control signal at the wavelength of 1.3 µm, is simulated through the finite-difference time-domain method, where both signals are desirable in optical communication systems. A very high extinction ratio of 67 dB is achieved and the temporal characteristics of the switch are demonstrated.

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