scholarly journals Resonant frequency shift in coupled photonic crystal defects described by the tight-binding method

2007 ◽  
Vol 56 (5) ◽  
pp. 2742
Author(s):  
Cai Xu-Hong ◽  
Lin Xu-Sheng ◽  
Shi Quan ◽  
Zhao Nian-Shun
Keyword(s):  
Photonic Crystal ◽  
Resonant Frequency ◽  
Frequency Shift ◽  
Tight Binding ◽  
Crystal Defects ◽  
Resonant Frequency Shift ◽  
Tight Binding Method

Study on Double Defect Mode Sensing Mechanism of Air Gate Photonic Crystal Based on Tight-binding Method

2015 ◽  
Vol 42 (5) ◽  
pp. 0514001
Author(s):  
陈颖 Chen Ying ◽  
石佳 Shi Jia ◽  
卢波 Lu Bo ◽  
刘腾 Liu Teng ◽  
董晶 Dong Jing ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Tight Binding ◽  
Defect Mode ◽  
Sensing Mechanism ◽  
Tight Binding Method

A resonant tactile stiffness sensor for lump localization in robot-assisted minimally invasive surgery

2019 ◽  
Vol 233 (9) ◽  
pp. 909-920
Author(s):  
Yahui Yun ◽  
Yaming Wang ◽  
Hao Guo ◽  
Yaoyao Wang ◽  
Hongtao Wu ◽  
...  
Keyword(s):  
Minimally Invasive Surgery ◽  
Theoretical Model ◽  
Minimally Invasive ◽  
Resonant Frequency ◽  
Frequency Shift ◽  
Invasive Surgery ◽  
Tactile Sensor ◽  
Tissue Stiffness ◽  
Robot Assisted ◽  
Resonant Frequency Shift

A miniature resonant tactile sensor for tissue stiffness detection in robot-assisted minimally invasive surgery is proposed in this article. The proposed tactile sensor can detect tissue stiffness based on the principle of the resonant frequency shift when it contacts with tissue of different stiffness. A PZT (lead zirconate titanate) bimorph works simultaneously as the actuator and the sensing element, which is helpful for simplifying the structure. The resonant frequency shift can be deduced by measuring the electrical impedance of the PZT bimorph, since there will be an abrupt change of the impedance when resonance occurs. A unique structure of an Archimedean spiral metal sheet is introduced to restrict the outer size of the sensor within 10 mm and to keep the resonant frequency low. A theoretical model is established. Finite element method analyses are carried out to validate the working principle and it meets the theoretical model quite well. Several silicone samples are tested with the sensor and the results show that the proposed sensor is capable of measuring tissue stiffness within the range of 0–2 MPa, detecting and locating lumps inside tissue.

MASS DETECTION USING SINGLE WALLED BORON NITRIDE NANOTUBE AS A NANOMECHANICAL RESONATOR

NANO ◽  
2012 ◽  
Vol 07 (04) ◽  
pp. 1250029 ◽  
Author(s):  
MITESH B. PANCHAL ◽  
S. H. UPADHYAY ◽  
S. P. HARSHA
Keyword(s):  
Boron Nitride ◽  
Resonant Frequency ◽  
Frequency Shift ◽  
Continuum Mechanics ◽  
Boron Nitride Nanotubes ◽  
Tube Length ◽  
Thin Wall ◽  
Nanomechanical Resonators ◽  
Mass Sensitivity ◽  
Resonant Frequency Shift

The feasibility of the Boron Nitride Nanotubes (BNNTs) as nanomechanical resonators, using continuum mechanics based approach and finite element method (FEM) is illustrated in this paper. Two types of end constraints of single walled boron nitride nanotubes (SWBNNTs), namely cantilevered and bridged are assumed. Analytical formulas based on continuum mechanics are used to examine the mass sensitivity of SWBNNTs considering as a thin wall tubes for both types of end constraints for different lengths and different diameters. The FEM analysis, considering SWBNNT as a transversely anisotropic material is performed and results are compared with the continuum mechanics based approach. The results indicated that the mass sensitivity of SWBNNT-based nanomechanical resonators can reach 10-8fg and a logarithmically linear relationship exists between the resonant frequency and the attached mass, when mass is larger than 10-7fg. The sensitivity of resonant frequency shift to both tube length and diameter has also been demonstrated. It is clear that the change in resonant frequency shift to tube length is more significant than that with the tube diameter and mass sensitivity increases when smaller size nanotube resonators are used in mass sensors. The simulation results based on present FEM found in good agreement with the analytical approach.

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