How silicon and boron dopants govern the cryogenic scintillation properties of N-type GaAs

Derenzo, Stephen E.; Bourret, Edith; Frank‐Rotsch, Ch.; Hanrahan, Stephen M.; Garcia-Sciveres, M.

doi:10.1016/j.nima.2020.164957

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…For certain structures, one could expect even greater scintillation enhancements on the order of ~4 n 2 in the ray-optics approximation ( 44 ) or ~4π n 2 for periodic structures on the wavelength scale ( 46 , 47 ) (where n is the index of refraction). For example, for a thin high-index material such as doped GaAs, which also scintillates at room temperature ( 49 ), enhancements on the order of ~50 and ~150 could be respectively achieved in the two regimes (over a 2π collection solid angle).…”

Section: Observation Of Strongly Enhanced Scintillation Induced By X-...mentioning

confidence: 99%

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A framework for scintillation in nanophotonics

Roques‐Carmes

Rivera

Ghorashi

et al. 2022

Science

105

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Bombardment of materials by high-energy particles often leads to light emission in a process known as scintillation. Scintillation has widespread applications in medical imaging, x-ray nondestructive inspection, electron microscopy, and high-energy particle detectors. Most research focuses on finding materials with brighter, faster, and more controlled scintillation. We developed a unified theory of nanophotonic scintillators that accounts for the key aspects of scintillation: energy loss by high-energy particles, and light emission by non-equilibrium electrons in nanostructured optical systems. We then devised an approach based on integrating nanophotonic structures into scintillators to enhance their emission, obtaining nearly an order-of-magnitude enhancement in both electron-induced and x-ray–induced scintillation. Our framework should enable the development of a new class of brighter, faster, and higher-resolution scintillators with tailored and optimized performance.

show abstract

Section: Observation Of Strongly Enhanced Scintillation Induced By X-...mentioning

confidence: 99%

“…For example, for a thin high-index material such as doped GaAs, which also scintillates at room temperature (49), enhancements on the order of ~50 and ~150 could be respectively achieved in the two regimes (over a 2p collection solid angle).…”

Section: Observation Of Strongly Enhanced Scintillation Induced By X-...mentioning

confidence: 99%

A framework for scintillation in nanophotonics

Roques‐Carmes

Rivera

Ghorashi

et al. 2022

Science

105

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“…Many developing applications for SNSPDs such as sub-GeV DM searches using n-type GaAs as cryogenic scintillating targets [27][28][29]45 and nanowires directly as target masses 46 require large sensor active areas (cm 2 -scale) to realize a robust experiment [47][48][49] . As a nanofabrication technique, the serial nature of EBL becomes unfeasible to write dense micronscale patterns over large active areas, and the 1 mm 2 devices are at the limit of EBL's scope.…”

Section: Discussionmentioning

confidence: 99%

“…The mm 2 arrays fabricated in this work are a promising photosensor for a novel DM search experiment using cryogenic scintillating targets. Scintillating n-type GaAs doped with silicon and boron has recently been proposed as a target for detecting sub-GeV DM via electron recoils [27][28][29] . The emission bands of n-type GaAs are centered at 860 nm, 930 nm, 1070 nm, 1335 nm, with the 930 nm band having the highest luminosity.…”

Section: Introductionmentioning

confidence: 99%

Large active-area superconducting microwire detector array with single-photon sensitivity in the near-infrared

Luskin¹,

Schmidt²,

Korzh³

et al. 2023

Preprint

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Superconducting nanowire single photon detectors (SNSPDs) are the highest-performing technology for time-resolved single-photon counting from the UV to the near-infrared. The recent discovery of single-photon sensitivity in micrometer-scale superconducting wires is a promising pathway to explore for large active area devices with application to dark matter searches and fundamental physics experiments. We present 8-pixel 1mm 2 superconducting microwire single photon detectors (SMSPDs) with 1 µm-wide wires fabricated from WSi and MoSi films of various stoichiometries using electron-beam and optical lithography. Devices made from all materials and fabrication techniques show saturated internal detection efficiency at 1064 nm in at least one pixel, and the best performing device made from silicon-rich WSi shows single-photon sensitivity in all 8 pixels and saturated internal detection efficiency in 6/8 pixels. This detector is the largest reported active-area SMSPD or SNSPD with near-IR sensitivity published to date, and the first report of an SMSPD array. By further optimizing the photolithography techniques presented in this work, a viable pathway exists to realize larger devices with cm 2 -scale active area and beyond.

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“…One could expect even greater scintillation enhancements on the order of ∼ 4n 2 in the ray-optics approximation [39] or ∼ 4πn 2 for periodic structures on the wavelength scale [41,42] (where n is the index of refraction). For example, for a high-index material such as doped GaAs, which also scintillates at room temperature [44], enhancements on the order of ∼ 50 and ∼ 150 could be respectively achieved in the two regimes (over a 2π collection solid angle).…”

Section: Observation Of Strongly Enhanced Scintillation Induced By X-...mentioning

confidence: 99%

A general framework for scintillation in nanophotonics

Roques-Carmes,

Rivera,

Ghorashi

et al. 2021

Preprint

View full text Add to dashboard Cite

Bombardment of materials by high-energy particles (e.g., electrons, nuclei, X-and γ-ray photons) often leads to light emission, known generally as scintillation. Scintillation is ubiquitous and enjoys widespread applications in many areas such as medical imaging, X-ray non-destructive inspection, night vision, electron microscopy, and high-energy particle detectors. A large body of research focuses on finding new materials optimized for brighter, faster, and more controlled scintillation. Here, we develop a fundamentally different approach based on integrating nanophotonic structures into scintillators to enhance their emission. To start, we develop a unified and ab initio theory of nanophotonic scintillators that accounts for the key aspects of scintillation: the energy loss by high-energy particles, as well as the light emission by non-equilibrium electrons in arbitrary nanostructured optical systems. This theoretical framework allows us, for the first time, to experimentally demonstrate nearly an order-of-magnitude enhancement of scintillation, in both electron-induced, and X-ray-induced scintillation. Our theory also allows the discovery of structures that could eventually achieve several orders-of-magnitude scintillation enhancement. The framework and results shown here should enable the development of a new class of brighter, faster, and higher-resolution scintillators with tailored and optimized performances − with many potential applications where scintillators are used.

show abstract

How silicon and boron dopants govern the cryogenic scintillation properties of N-type GaAs

Cited by 6 publications

References 22 publications

A framework for scintillation in nanophotonics

A framework for scintillation in nanophotonics

Large active-area superconducting microwire detector array with single-photon sensitivity in the near-infrared

A general framework for scintillation in nanophotonics

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