10 Realization of Artificial Chirality in Micro-/Nano-Scale …
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Fig. 10.2 Understanding of buckled structures fabricated by focused ion beam, a The rosette
arrays are fabricated with buckling process with focused ion beam. Two different handedness can
be fabricated, b A global radiation buckle a thin films. Right image shows a pre-buckled structure. the
left-one shows post-bucked structures, c A film are buckled by global radiation, d measured chiral
reponses of bucked structures, e The buckling process dramatically increase an optical rotation.
(a–e) from [15]
Fig. 10.3 Artificial chiral structures using photolithography and electroplating. a SEM image
shows fabricated 3D chiral structures, b A unit-cell is consist of four-chiral structures and they are
composed of four different materials, c SEM image shows a rotating arrangement of chiral structures
by consisting unit-cell. The rotating arrangement induces chiral responses, d Schematic shows a
fabrication process for chiral structures, e-f Handedness switch can be described by LC-circuit
interpretation. (a–f) from [21]
on the spin-states of the circularly-polarized light and can be expanded to threedimensional twisted structures. The different optical response is related to the electromagnetic coupling, which can be enhanced by three-dimensional structures [22].
Figure 10.2a, b show twisted chiral structures fabricated using a FIB, achieving a
strong chiral response from three-dimensional structures using the residual stress
of films. This method can be used to create versatile geometric structures with ion
beam dose splitting (Fig. 10.2c). The fabricated buckled structures have CD of ~0.5
at 1.45 μm that can be used in telecommunications (Fig. 10.2d). Buckled structures
have increased angles of optical rotation, compared to unbuckled structures in the
telecommunications region (Fig. 10.2e). These results imply that three-dimensional
fabrication methods can strengthen chiroptical phenomena.
245
Fig. 10.2 Understanding of buckled structures fabricated by focused ion beam, a The rosette
arrays are fabricated with buckling process with focused ion beam. Two different handedness can
be fabricated, b A global radiation buckle a thin films. Right image shows a pre-buckled structure. the
left-one shows post-bucked structures, c A film are buckled by global radiation, d measured chiral
reponses of bucked structures, e The buckling process dramatically increase an optical rotation.
(a–e) from [15]
Fig. 10.3 Artificial chiral structures using photolithography and electroplating. a SEM image
shows fabricated 3D chiral structures, b A unit-cell is consist of four-chiral structures and they are
composed of four different materials, c SEM image shows a rotating arrangement of chiral structures
by consisting unit-cell. The rotating arrangement induces chiral responses, d Schematic shows a
fabrication process for chiral structures, e-f Handedness switch can be described by LC-circuit
interpretation. (a–f) from [21]
on the spin-states of the circularly-polarized light and can be expanded to threedimensional twisted structures. The different optical response is related to the electromagnetic coupling, which can be enhanced by three-dimensional structures [22].
Figure 10.2a, b show twisted chiral structures fabricated using a FIB, achieving a
strong chiral response from three-dimensional structures using the residual stress
of films. This method can be used to create versatile geometric structures with ion
beam dose splitting (Fig. 10.2c). The fabricated buckled structures have CD of ~0.5
at 1.45 μm that can be used in telecommunications (Fig. 10.2d). Buckled structures
have increased angles of optical rotation, compared to unbuckled structures in the
telecommunications region (Fig. 10.2e). These results imply that three-dimensional
fabrication methods can strengthen chiroptical phenomena.