Tunable reflective Fourier ptychographic microscopy using a digital micromirror device and an LED source

We propose a tunable reflective Fourier ptychographic microscopy approach in which the resolution and field of view are variable with different objective lenses and a digital micromirror device. Several objective lenses are applied to tunable reflective Fourier ptychographic microscopy without additional optical alignment while also enhancing the resolution. To demonstrate the feasibility of the new technique, tunable reflective Fourier ptychographic microscopy with 10 × and 50 × objective lenses is demonstrated. Moreover, we compare the resolution of the new technique and conventional Fourier ptychographic microscopy to verify the improved resolution of the new technique.