Multispectral imaging (MSI) provides scenes with multiple narrowband spectral channels. It plays an important role in disciplines such as remote sensing and medical diagnoses. Based on multispectral filter arrays (MSFA), fast and integrated multispectral imaging can be achieved. We demonstrate a wide range multispectral Fabry-Perot (FP) color filter array based on two-dimensional subwavelength gratings and selective suppression. A thin metal layer is added inside the cavity of a FP resonator to selectively suppress the odd-order resonant peaks. The metal layer provides a larger free spectral range and smaller full width at half maximum (FWHM) compared to the conventional FP resonator while maintaining the high transmission. It also reduces the infrared transmission off the reflection range of the distributed Bragg mirror of the FP resonator. With selective suppression, we can exploit the second-order resonant peak by suppressing the odd-order resonant peaks. The smaller reflection phase shift and FWHM of the second-order transmission peak enable a wide range MSFA covering a spectrum from red to NIR (630nm-960nm) with FWHM smaller than 30nm. To be able to tune the resonant peak, we pattern nano-rods with grating or mesh structures in the cavity layers. By manipulating the shape and the size of nano-rods, we can tune the transmission peaks without changing the physical thicknesses of the layers. This has the promise of a monolithic broadband multispectral color filter array and paves the way for one-shot multispectral imaging.
We present an inverse weak value amplification (IWVA) scheme to perform precision frequency measurements in an integrated optics environment. The IWVA technique allows us to amplify small signals by introducing a weak perturbation to the system and performing a post-selection on the data. A Bragg grating with two band gaps is used to convert the optical frequency into a phase, and a perturbation is applied to the mode coefficients. We demonstrate the advantages of a Bragg grating with two band gaps for obtaining high transmission and low group velocity. We numerically model the interferometer, and demonstrate that we obtain the desired amplification effect. By using an on-chip device instead of a free space implementation, precision measurements can be carried out in a small volume with reliable performance.
A modular laboratory curriculum with exercises for students and lesson plans for teachers is presented. Fundamentals of basic integrated photonic (IP) devices can be taught, first as a lecture-in-the-lab followed by “hands-on” laboratory measurements. This comprehensive curriculum utilizes data collected from the “AIM Photonics Institute PIC education chip” that was designed specifically for the purpose of education, and was fabricated at AIM SUNY Poly. Training using this modular curriculum will be performed through the AIM Photonics Academy network in New York (NY) and Massachusetts (MA), either as a full semester course or as a condensed boot-camp. A synergistic development and delivery of this curriculum will coherently leverage multiple resources across the network and can serve as a model for education and workforce development in other Manufacturing USA institutes, as well as for overseas partners.
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