Abstract: In this paper, we propose and validate a new approach for increasing the optical bandwidth of waveguide grating couplers by using a center-symmetric grating structure. Our results ...
Abstract: We describe a high-efficiency grating coupler (GC) fabricated on a silicon-on-insulator wafer with 220 nm top silicon layer. One single 60 nm shallow etch is required to define the ...
Subaru Telescope’s advanced Prime Focus Spectrograph (PFS) has been given a new Hawaiian name, ʻŌnohiʻula. This name recognizes the instrument’s embodiment of the idea of "perceiving the realm of our ...
Fibre Bragg grating (FBG) OH suppression is capable of greatly reducing the bright sky background seen by near infrared spectrographs. By filtering out the airglow emission lines at high resolution ...
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