Product Introduction

Terahertz monochromatic waveplates are generally used to convert polarization states of specific wavelengths. Due to the fact that these waveplates can only be applied to a single wavelength, they may be inconvenient to use in certain situations, such as tunable terahertz sources. In this case, a tunable terahertz waveplate（TWPC）It is a reasonable choice.

The tunable terahertz waveplate recently launched by Shanghai Yichi Optoelectronics can achieve phase transition of any single wavelength within a spectral range, and the accompanying software can calculate the conversion parameters and range.The tunable terahertz waveplate consists of three transparent quartz birefringent plates, each of which is mounted on a turntable360Rotate in degrees. The three turntables are strictly aligned and fixed on the same substrate. These films can be rotated to a specific angle to meet the phase delay of different polarization states at specific wavelengths. The rotation angle can be calculated by software. In addition to the rotation angle of the film, the software can also calculate the phase delay, effective optical axis, polarization angle, and corresponding wavelength relationship.

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Calculation data and actual measurementnumberaccording to

Adjustable terahertz harmonic chip（TWPC）The test data of different working modes are all collected in the Fourier spectrometerBruker Vertex 70Completed in the middle

1. Adjustable terahertz harmonic plate (TWPC) as a half wave plate

TWPC is placed between two parallel polarizing plates and tested at a wavelength of 120um

2. Adjustable terahertz harmonic plate (TWPC) as a quarter wave plate

Calculation data: TWPC is placed between two polarizing plates to detect the transmittance curves of the polarizing plates at different angles, with a test wavelength of 220um

3. Adjustable terahertz harmonic plate (TWPC) as birefringent filter

TWPC is placed between two orthogonal polarizing plates and tested at a wavelength of 120um