A novel uni-traveling-carrier photodetector (UTC-PD) structure with an integrated focusingreflection (FR) mirror realized by a non-periodic concentric circular high-contrast grating (NP-CC-HCG), referred to as FR-UTC-PD, is proposed to enhance responsivity in conventional UTC-PDs. The FR-UTC-PD allows improving the responsivity by 36.5% at a 1.55-μm wavelength as compared to a UTC-PD without integrated an FR mirror with 84.59% reflectivity. For 40-μm-diameter PDs, the obtained 3-dB bandwidths are unaltered wi…
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