Abstract
We propose a superconducting nanowire single photon detector (SNSPD) that can work efficiently at two target wavelengths and has a significant improvement in the counting rate due to the low-filling-factor nanowires in the silicon slots and the silver reflector. Numerical simulations show that the absorption efficiency can be over 90% at a single wavelength, whether the incident light wavelength is 1550 nm or 1064 nm, and over 80% when the SNSPD is designed to work at both wavelengths. In addition, the reset time is about 24% of the conventional SNSPDs. Our work presents a design for fabricating faster, larger-area, and multispectral SNSPDs with a high efficiency, which can be applied in applications such as quantum optics communication and multiwavelength sensing.
Highlights
In the past decade, superconducting nanowire single photon detectors (SNSPDs)1 have attracted dynamic attention owing to their excellent performances, such as high system detection efficiency (SDE),2 low dark count rate (DCR),3 high count rate,4,5 and low time jitter,6 thereby enabling numerous applications, including measurement-device-independent quantum key distribution,7 quantum random number generator,8 ultra-long range optical communication,9 and single photon quantum imager
Due to the Si–hydrogen silsesquioxane (HSQ)–Si slots, the optical absorption efficiency of the nanowires can be over 90% whether the wavelength of the incident light is 1550 nm or 1064 nm, though the pitch is as large as 732 nm or 674 nm
The reset time is defined as the time needed for the device efficiency recovering up to 90% of the device efficiency in the origin state after a detection event
Summary
In the past decade, superconducting nanowire single photon detectors (SNSPDs) have attracted dynamic attention owing to their excellent performances, such as high system detection efficiency (SDE), low dark count rate (DCR), high count rate, and low time jitter, thereby enabling numerous applications, including measurement-device-independent quantum key distribution, quantum random number generator, ultra-long range optical communication, and single photon quantum imager. These applications make full use of the accurate and fast response characteristics of the SNSPDs; the performances of SNSPDs are vital to the development of other optical fields. In the past decade, superconducting nanowire single photon detectors (SNSPDs) have attracted dynamic attention owing to their excellent performances, such as high system detection efficiency (SDE), low dark count rate (DCR), high count rate, and low time jitter, thereby enabling numerous applications, including measurement-device-independent quantum key distribution, quantum random number generator, ultra-long range optical communication, and single photon quantum imager.. In the past decade, superconducting nanowire single photon detectors (SNSPDs) have attracted dynamic attention owing to their excellent performances, such as high system detection efficiency (SDE), low dark count rate (DCR), high count rate, and low time jitter, thereby enabling numerous applications, including measurement-device-independent quantum key distribution, quantum random number generator, ultra-long range optical communication, and single photon quantum imager.10 These applications make full use of the accurate and fast response characteristics of the SNSPDs; the performances of SNSPDs are vital to the development of other optical fields. We report on a multispectral and low-filling-factor SNSPD with a high optical absorption efficiency and a high counting rate and analyze its performances systematically
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