TY - JOUR
T1 - Linear and nonlinear chiroptical response from individual 3D printed plasmonic and dielectric micro-helices
AU - Famularo, Nicole R.
AU - Kang, Lei
AU - Li, Zehua
AU - Zhao, Tian
AU - Knappenberger, Kenneth L.
AU - Keating, Christine D.
AU - Werner, Douglas H.
N1 - Funding Information:
Numerical simulation, microparticle printing, and SEM characterization in this research were supported by the Penn State Materials Research Science and Engineering Center (MRSEC, Grant No. NSF DMR-1420620) and were carried out in the Nanofabrication Laboratory at Penn State’s Materials Research Institute. The optical characterization in this work was supported by the Air Force Office of Scientific Research (Grant No. FA9550-18-1-0347) and the National Science Foundation (Grant No. NSF CHE-1801829). N.R.F. was supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE1255832.
Publisher Copyright:
© 2020 Author(s).
PY - 2020/10/21
Y1 - 2020/10/21
N2 - Sub-wavelength chiral resonators formed from artificial structures exhibit exceedingly large chiroptical responses compared to those observed in natural media. Owing to resonant excitation, chiral near fields can be significantly enhanced for these resonators, holding great promise for developing enantioselective photonic components such as biochemical sensors based on circular dichroism (CD) and spin-dependent nonlinear imaging. In the present work, strong linear and nonlinear chiroptical responses (scattering CD > 0.15 and nonlinear differential CDs > 0.4) at visible and near infrared frequencies are reported for the first time for individual micrometer-scale plasmonic and dielectric helical structures. By leveraging dark-field spectroscopy and nonlinear optical microscopy, the circular-polarization-selective scattering behavior and nonlinear optical responses (e.g., second harmonic generation and two-photon photoluminescence) of 3D printed micro-helices with feature sizes comparable to the wavelength (total length is ∼5λ) are demonstrated. These micro-helices provide potential for readily accessible photonic platforms, facilitating an enantiomeric analysis of chiral materials. One such example is the opportunity to explore ultracompact photonic devices based on single, complex meta-atoms enabled by state-of-the-art 3D fabrication techniques.
AB - Sub-wavelength chiral resonators formed from artificial structures exhibit exceedingly large chiroptical responses compared to those observed in natural media. Owing to resonant excitation, chiral near fields can be significantly enhanced for these resonators, holding great promise for developing enantioselective photonic components such as biochemical sensors based on circular dichroism (CD) and spin-dependent nonlinear imaging. In the present work, strong linear and nonlinear chiroptical responses (scattering CD > 0.15 and nonlinear differential CDs > 0.4) at visible and near infrared frequencies are reported for the first time for individual micrometer-scale plasmonic and dielectric helical structures. By leveraging dark-field spectroscopy and nonlinear optical microscopy, the circular-polarization-selective scattering behavior and nonlinear optical responses (e.g., second harmonic generation and two-photon photoluminescence) of 3D printed micro-helices with feature sizes comparable to the wavelength (total length is ∼5λ) are demonstrated. These micro-helices provide potential for readily accessible photonic platforms, facilitating an enantiomeric analysis of chiral materials. One such example is the opportunity to explore ultracompact photonic devices based on single, complex meta-atoms enabled by state-of-the-art 3D fabrication techniques.
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U2 - 10.1063/5.0020539
DO - 10.1063/5.0020539
M3 - Article
C2 - 33092362
AN - SCOPUS:85093928396
SN - 0021-9606
VL - 153
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 15
M1 - 154702
ER -