A HOLOGRAPHIC WAVE-GUIDE MICROLENS ARRAY FOR SURFACE-NORMAL OPTICAL INTERCONNECTS

In this letter, we present an array of holographic focusing lenses for surface normal optical interconnects. The profile-mismatch-induced co upling problem between input lasers and high-speed photodetectors is s olved by employing a holographic microlens array. The holographic micr olens array demonstrated has 1-mm focal length at the wavelength of 63 2.8 nm, with a lens-to-lens separation of 0.58 mm. The measured 3-dB f ocal spot size is determined to be 15 mu m x 14 mu m. The method for d esigning and recording a substrate mode surface-normal holographic len s array with different recording and readout wavelengths is also prese nted.