TY - JOUR
T1 - Thermally Triggered Multilevel Diffractive Optical Elements Tailored by Shape-Memory Polymers for Temperature History Sensors
AU - Kyeong, Dokyung
AU - Kim, Minsu
AU - Kwak, Moonkyu
N1 - Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/2/22
Y1 - 2023/2/22
N2 - The morphological transitions induced by external stimuli in shape-memory polymers (SMPs) can be exploited with the real-time response of far-field diffraction patterns in diffractive optical elements (DOEs). In this paper, we combine the temperature characteristics of SMPs and the display characteristics of DOEs to obtain an optical temperature sensing film where the temperature information is taken as a change of far-field diffraction images. This process was achieved by imprinting the micropatterns of the DOEs on the epoxy-based SMP film, which can be programmed to hold a temporary optical image and revert to its original image upon exposure to a specific temperature. Furthermore, the specific temperature at which the image transformation occurs can be customized by varying the chain flexibility of the SMP. Based on a range of transition points, by imprinting the desired combination of SMP-DOEs on a film, a sensor that can record and inform the temperature history is demonstrated. As for the feasible application of this technique, it can be used for the compact and reliable optical temperature indicators, which can be applied in temperature-sensitive industries such as food and pharmaceuticals.
AB - The morphological transitions induced by external stimuli in shape-memory polymers (SMPs) can be exploited with the real-time response of far-field diffraction patterns in diffractive optical elements (DOEs). In this paper, we combine the temperature characteristics of SMPs and the display characteristics of DOEs to obtain an optical temperature sensing film where the temperature information is taken as a change of far-field diffraction images. This process was achieved by imprinting the micropatterns of the DOEs on the epoxy-based SMP film, which can be programmed to hold a temporary optical image and revert to its original image upon exposure to a specific temperature. Furthermore, the specific temperature at which the image transformation occurs can be customized by varying the chain flexibility of the SMP. Based on a range of transition points, by imprinting the desired combination of SMP-DOEs on a film, a sensor that can record and inform the temperature history is demonstrated. As for the feasible application of this technique, it can be used for the compact and reliable optical temperature indicators, which can be applied in temperature-sensitive industries such as food and pharmaceuticals.
KW - convolutional neural network
KW - diffractive optical elements
KW - imprint lithography
KW - shape-memory polymer
KW - temperature sensor
UR - http://www.scopus.com/inward/record.url?scp=85148345850&partnerID=8YFLogxK
U2 - 10.1021/acsami.2c18901
DO - 10.1021/acsami.2c18901
M3 - Article
AN - SCOPUS:85148345850
SN - 1944-8244
VL - 15
SP - 9813
EP - 9819
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 7
ER -