Mr. Zhongyao Zhu Profile

Zhongyao Zhu

at BRIMET

SPIE Involvement:

Author

Publications (3)

SPIE Journal Paper | 26 April 2024

Design of multispectral remote sensing filter film and research on film thickness monitoring technology

Fu Xiuhua, Wei Yujun, Zhu Zhongyao, Wang Ben, Li Gang, Dong Suotao, Saeedeh Ghasemzadeh

OE, Vol. 63, Issue 04, 043106, (April 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.4.043106

KEYWORDS: Tunable filters, Design, Optical sensing, Film thickness, Transmittance, Crystals, Remote sensing, Thin films, Optical filters, Near infrared

Read Abstract +

Proceedings Article | 9 October 2021 Paper

Development of spectral filter element for terahertz nondestructive testing system

Ye Wang, Xiuhua Fu, Lijun Wang, Yongyi Chen, Zhongyao Zhu, Li Qin, Jinlong Zhang

Proceedings Volume 11906, 1190609 (2021) https://doi.org/10.1117/12.2604008

KEYWORDS: Optical filters, Nondestructive evaluation, Terahertz radiation, Transmittance, Thin films, Terahertz technology, Refractive index, Reflectivity, Annealing, Absorption

Read Abstract +

Terahertz nondestructive testing technology is a technology widely used in samples evaluation with the merit of on-site and surface-damage free. Terahertz waves have low quantum energy and are transparent to most non-polar substances, thus, terahertz nondestructive testing has gradually become a research hotspot over the years. However when a femtosecond laser in used as a terahertz excitation source, the excess pump light in the system may cause radiation damage to the measured object. In order to eliminate the impact of residual pump light in the system on the measured object, we designed the spectral filter elements of reflect and terahertz band transmission in the wave bands of 0.80 μm and 1.56 μm, by using Nb₂O₅ and SiO₂ as high and low refractive index materials, respectively. Then we prepared the filter membrane system electron beam evaporation through an ion beam assisted deposition. The influence of annealing process on the growth structure of the films was analyzed according to the AFM test results of Nb₂O₅ monolayer films under different process conditions, and the annealing process parameters were optimized to reduce the influence of surface roughness on the film spectrum. Based on the KIM vibration model (Lorentz extension model), the optical constant dispersion distributions of NB2O5 thin flims prepared under different processing conditions were accurately fitted. The influence of temperature on the refractive index and absorption of Nb₂O₅thin films were analyzed. The deposition temperature was optimized to reduce the absorption of the filter in the wave bands of 0.8 μm and 1.560 μm. By using PE Lambda 1050, the reflectivity of the prepared filter in the wave bands of 0.8 μm and 1.560 μm were tested. The prepared filter was scanned by focusing point by point using a built-up transmission terahertz time domain spectral system. The transmittance of the quartz coated sample relative to the reference signal was calculated by analyzing signals in the frequency domain. The average reflectivity of the prepared spectral filter was 99.9% in both the band of 0.9 μm and 1.560 μm. The transmittance of terahertz frequency 2 THz was 68%, which was almost consistent with the theoretical design values, and could meet the requirements for the terahertz nondestructive testing system's application.

Proceedings Article | 28 February 2017 Paper

Design of ocular for optical sight with long exit pupil distance

Zhongyao Zhu, Yuyao Li, Ailing Tian

Proceedings Volume 10256, 102560H (2017) https://doi.org/10.1117/12.2268985

KEYWORDS: Optical design

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years