TY - JOUR
T1 - Bending mechanism of optically actuated all-optical mechanical switches composed of bilayer waveguides
AU - Wang, Y.
AU - Wang, K. F.
AU - Wang, Baolin
PY - 2022
Y1 - 2022
N2 - Due to the requirement of high speed of signal switching in sensing, communications, and computation, fast switching all-optical mechanical switches have attracted considerable attention. Bending deformation will change the effective index of the switching medium which could switch the signal. Therefore, in this paper, an approximate expression of optical gradient forces of bilayer waveguides is provided firstly. Based on this expression, the bending behavior of an optically actuated switch composed of bilayer waveguides is investigated. It is found that the sequences of stacking two waveguides will significantly influence the magnitude of optical gradient forces. The effective medium theory is not suitable to predict optical gradient forces of bilayer waveguides. In addition, to achieve the maximal bending deflection, the optimal values of the refractive index are calculated for the switch with different thickness ratios. This finding indicates that if the deflection is constrained, the required smallest control light power can be obtained. The optimized deflection of the switch can be obtained by adjusting the value of the refractive indices of the bilayer waveguides and their thickness ratio.
AB - Due to the requirement of high speed of signal switching in sensing, communications, and computation, fast switching all-optical mechanical switches have attracted considerable attention. Bending deformation will change the effective index of the switching medium which could switch the signal. Therefore, in this paper, an approximate expression of optical gradient forces of bilayer waveguides is provided firstly. Based on this expression, the bending behavior of an optically actuated switch composed of bilayer waveguides is investigated. It is found that the sequences of stacking two waveguides will significantly influence the magnitude of optical gradient forces. The effective medium theory is not suitable to predict optical gradient forces of bilayer waveguides. In addition, to achieve the maximal bending deflection, the optimal values of the refractive index are calculated for the switch with different thickness ratios. This finding indicates that if the deflection is constrained, the required smallest control light power can be obtained. The optimized deflection of the switch can be obtained by adjusting the value of the refractive indices of the bilayer waveguides and their thickness ratio.
UR - https://hdl.handle.net/1959.7/uws:76537
U2 - 10.1016/j.ijmecsci.2022.107234
DO - 10.1016/j.ijmecsci.2022.107234
M3 - Article
SN - 0020-7403
VL - 222
JO - International Journal of Mechanical Sciences
JF - International Journal of Mechanical Sciences
M1 - 107234
ER -