scholarly journals A High-Resolution Reflective Microwave Planar Sensor for Sensing of Vanadium Electrolyte

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3759
Author(s):  
Nazli Kazemi ◽  
Kalvin Schofield ◽  
Petr Musilek
Keyword(s):  
High Resolution ◽  
Material Characterization ◽  
Dielectric Material ◽  
Negative Resistance ◽  
Ring Resonators ◽  
Sensing Element ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Front End ◽  
Vanadium Redox

Microwave planar sensors employ conventional passive complementary split ring resonators (CSRR) as their sensitive region. In this work, a novel planar reflective sensor is introduced that deploys CSRRs as the front-end sensing element at fres=6 GHz with an extra loss-compensating negative resistance that restores the dissipated power in the sensor that is used in dielectric material characterization. It is shown that the S11 notch of −15 dB can be improved down to −40 dB without loss of sensitivity. An application of this design is shown in discriminating different states of vanadium redox solutions with highly lossy conditions of fully charged V5+ and fully discharged V4+ electrolytes.

Multiple Metamaterial Pattern Integration for Polarization Selective Photodetector Applications

MRS Advances ◽  
2018 ◽  
Vol 3 (33) ◽  
pp. 1907-1912
Author(s):  
Corey Shemelya ◽  
Nicole A. Pfiester ◽  
Dante DeMeo ◽  
Thomas Rotter ◽  
Ganesh Balakrishnan ◽  
...  
Keyword(s):  
Applied Voltage ◽  
Material Characterization ◽  
Ring Resonators ◽  
Dynamic Polarization ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Optical Responses ◽  
Pattern Integration ◽  
Polarization Filtering ◽  
On Chip

ABSTRACTInterest in active metamaterial (MM) devices has recently increased due to their potential for tunable, switchable, and scalable optical responses. More specifically, a dynamic, on-chip MM polarizer has applications ranging from material characterization to sensing without the need for cumbersome external filters. This work demonstrates efforts to optimize MM devices for dynamic polarization filtering by combining elements from split-ring resonators, wire-pairs, and fishnet patterns. The polarization grid has been designed to operate under an applied voltage with simulated on/off ratios of 75% and dynamic polarization selectivity of 70%. Samples have been fabricated using epitaxial GaAs on sapphire with various n-type doping concentrations to approximate electrical tuning.

scholarly journals Terahertz sensor with resonance enhancement based on square split-ring resonators

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Zhonggang Xiong ◽  
Liping Shang ◽  
Jieping Yang ◽  
Linyu Chen ◽  
Jin Guo ◽  
...  
Keyword(s):  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Resonance Enhancement
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