2015 Fiscal Year Research-status Report
Infrared micro-sensor based on 3D photonic crystal
| Project/Area Number |
15K04637
|
|---|
| Research Institution | Shizuoka University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2015-04-01 – 2018-03-31
|
| Keywords | photonic crystal / structural color / direct laser write / infra-red sensor / laser lithography |
|---|
| Outline of Annual Research Achievements |
1. Optical properties of natural Morpho butterfly wings were investigated theoretically and experimentally to identify its IR sensitivity mechanisms. It was confirmed that from thermal expansion of the lattice and refractive index modification are the main mechanisms.
2. PhCs were designed theoretically using Finite-Difference Time-Domain (FDTD) simulation. It was determined that bright structural color required for IR detection can be most easily obtained using 3D woodpile architecture photonic crystals. The required lattice parameters of these structures were determined from numerical simulations.
3. It was determined that photoresists SU-8 and SZ2080 are the most suitable starting materials for the fabrication of samples.
4. Prototype PhC samples were fabricated by Direct Laser Write (DLW) in photoresist SZ2080. Their characterisation by micro-reflectance spectroscopy has revealed strong structural colour in these samples. The colour can be controlled by varying parameters of the photonic crystal lattice.
|
| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Most of the goals planned for the FY2015 have been successfully achieved because research activities were carefully planned in advance.It is most important for this study, that photonic crystals exhibiting structural colour effect were realised successfully.
|
| Strategy for Future Research Activity |
Successful implementation of the goals planned for the FY2015 ensures that in FY2016 research will proceed towards the most challenging point of the entire research: obtaining experimental evidence that structural colour of artificial PhC structures can be modified by external IR irradiation.
If IR sensitivity of the fabricated samples will prove to be insufficient, the following steps will be undertaken:
1. The photoresist will be doped with IR absorbers (organic dye, carbon nanotubes, quantum dots) to increase IR absorption.
2. If IR sensitivity of artificial PhCs will be too low for demonstration of functional devices, additional studies of physical mechanism of IR sensitivity in natural and artificial PhC samples will be conducted in order to identify the problem. Fabrication and characterization efforts will be repeated if necessary.
3. Immersion of the samples in various liquids, such as water, ethanol, isopropanol, and others, whose refractive index is strongly dependent on the temperature will be investigated. In this case, PhC structures become equivalent to diffractive optical elements (DOE) whose diffraction efficiency can be modified by IR irradiation. In such a case it is possible to realize IR micro-sensors with all-optical readout, providing similar functionality as that envisaged in the original goals of this research.
|
-
-
-
[Journal Article] Silk fibroin as a water-soluble bio-resist and its thermal properties2016
Author(s)
J. Morikawa, M. Ryu, K. Maximova, A. Balcytis, G. Seniutinas, L. Fan, V. Mizeikis, J. Li, X. Wang, M. Zamengo, X. Wang and S. Juodkazisc
-
Journal Title
RSC Advances
Volume: 6
Pages: 11863-11869
DOI
Peer Reviewed / Int'l Joint Research
-
-
-
-
-
