Thin-film lithium niobate (TFLN) has emerged as a powerful platform for integrated photonics, offering outstanding electro-optic, nonlinear optical, and ferroelectric properties. These unique material characteristics have opened new opportunities for developing high-performance photodetectors with broad spectral response, high sensitivity, and compact integration. This review provides a comprehensive overview of recent progress in TFLN-based detectors, focusing on the underlying physical mechanisms and diverse device architectures.
