THz near-field electro-optic probe based on a microresonator

Electro-optic detection of THz pulses typically requires a long non-linear crystal to accumulate a measurable electro- optic phase shift. The large crystal size prevents application of the method in high-resolution THz near-field microscopy. An electro-optic microresonator that enhances the electro-optic phase shift in a small volume is proposed for the high-resolution near-field detection of THz pulses. Frequency response of the microresonator probe is evaluated for different resonator designs.