Dynamically control selective photo response in the visible light using phase change material. (May 2022)

• Record Type: Journal Article
• Authors: Zhang, Bowei; Tao, Yaxiong; Chamoli, Sandeep Kumar; Chen, Qi; Zhao, Kuo; Yu, YueHua; Wang, Bin
• Is Part Of: Optics & laser technology. Volume 149(2022)
• Publication Date: 2022-05
• Subjects: Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2022.107916
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: The cavity is made of phase change material (PCM) Sb2 S3 and acting as an active material, in which the mode present (i.e., perfectely absorbing) in one phase is absent (i.e., perfectely reflecting) in other due to high constrast in optical index between the two phases. The band edge of Sb2 S3 in its Cry and Amp state are in the 552 nm (green light) and 691 nm (red light) wavelength range. The selective photoresponse is optimized at two wavelength 552 nm (green light) and 691 nm (red light) with 0.6 A/W and 0.5 A/W responsivity. The photodetecor (PD) shows ~ 98 % absorption at 691 nm and ~ 86 % absorption at 552 nm with FWHM <100 nm, which is important charateristic of selective phtoresponse. We use Hyperbolic dispersion of hyperbolic metamaterial to achieve narrow high Q-factor response from photodetector. Abstract: A photodetector with a selective wavelength response is essential for many applications such as imaging, machine vision, and colour identification in particular. A state-of-the-art wavelength selective photodetector is a broadband photodetector mounted with a dichroic prism or an optical filter for selectivity. Furthermore, some of the designs depend on the engineering of the ratio of active material, for example, in triple halide lead perovskite for selective response. Here we numerically propose selective photoresponse using phase- change- material (PCM) antimony trisulfide (Sb2 S3 ) as an active medium. Sb2 S3 shows fast ∼70 ns and reversible phase transition between its Crystalline (Cry) and Amorphous (Amp) phase with significant contrast in refractive index. The phase transition can be controlled dynamically either by tharmal or optical means. The photo response (R) is optimized for 552 nm (green light) and 691 nm (red light) with R ∼0.5 A/W and R ∼0.6 A/W respectively. Moreover, we have shown that by integrating radiative cooling approach one can manage the heat accumulation due to photocurrent or incident light to maintain it's damage threshold. We have realized that one can maintain the PD temperature near to the ambience temperature even at 1000 W/m 2 . According to the simulations, the calculated operating temperatures under 1000 W/m 2 with and without radiative cooling are respectively 305 K and 345 K.