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(a) Schematic explanation of woodpile , square spiral and circular spiral architectures, and their parameters. For , rod-to-rod distance within the layer , layer-to-layer distance , and total number of layers . For spiral structures, these parameters are redefined. For both and , is the period of a square lattice in the plane on which spirals are centered, and is the vertical period of spirals. For , denotes the projection of a straight spiral segment on the plane, for , is the spiral diameter. Total height of the and samples comprises spiral periods. All structures consist of ellipsoidal SU-8 features elongated in the -axis direction (parallel to the laser beam during the DLW) have diameters and , and on the plane occupy an area of . (b) SEM micrograph of a woodpile structure fabricated on a glass substrate. The circular impression at the center is left by the flat punch during the tests that exceeded the elastic deformation limit.
(Color online) Stress-strain characteristics for (a) woodpile structures, and (b) square and circular spiral structures.
(Color online) Optical transmission of square spiral structures calculated by FDTD technique before and after the compressive deformation by 7% along the -axis direction. Parameters of the spiral are indicated in the plot. The inset shows in detail the attenuation regions near wavelength.
Parameters extracted from compression tests, structural modulus, ( and ) elastic collapse stress and strain, respectively, and height decrease prior to elastic collapse.
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