Hierarchical structures that combine microlens arrays and nanostructures exhibit exceptional potential in enhancing optical characteristics of optoelectronic devices. Furthermore, multi-scale architectures confer multifunctional capabilities to these devices. Existing methodologies for creating hierarchical structures can be classified by the initial structure fabricated: the "microfirst" and "nanofirst" approaches. Among these, the nanofirst strategy stands out as the most versatile, despite presenting challenges in 3D micropatterning on existing nanostructured surfaces. However, it leads to a greater challenge involving 3D micropatterning on existing nanostructured surfaces. To address this challenge, we propose a novel technique for fabricating hierarchical 3D microstructures through controlled bending of suspended microdisks. This method offers new perspectives on achieving hierarchical structures and 3D microstructures.
Historically LYNRED (created from the merger of SOFRADIR and ULIS in 2019) has used amorphous silicon materials (“a-Si”) as thermistor materials for its uncooled microbolometer products. If a-Si materials present several advantages that made the success of LYNRED’s products (easy to use and integrate in thermal camera), their intrinsic bolometric performances (i.e. TCR and 1/f noise) are still lower than the commonly used oxides thermistors[1] (i.e. VOx[2] and TiOx[3]). In order to stay in a leading position regarding sensor performances without any trade-off, LYNRED, with the support of its historical R&D partner the CEA-LETI, developed new materials. This strategy has led to new cutting edge products. At the end of 2020 a new 17 µm pixel pitch product (Pico640s[4]), with one of the highest sensor performance reported on the market (typical thermal sensitivity of 25 mK (f/1, 300K, 30Hz)), has been introduced in our product portfolio. We also launched our state of the art 12 µm product range with performances equivalent to our current 17µm product range. More generally, these developments open up new opportunities toward smaller pixel pitch. The symposium presentation and the associated article will present how we have increased the "Signal to Noise Ratio" (SNR) of our products while keeping all the elements which have been our hallmark. Special attention will be paid to NETD, stability of product characteristics during operation and manufacturing excellence. All these features were obtained only by hardware (at the pixel level) improvements without the need to use sophisticated algorithms or specific ROIC functions, in the spirit of LYNRED’s FPA products.
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