Color centers in wide-bandgap semiconductors for subdiffraction imaging: a review

Castelletto, Stefania; Boretti, Alberto

doi:10.1117/1.ap.3.5.054001

Cited by 12 publications

(11 citation statements)

References 163 publications

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“…By embedding fluorescent, charge-sensitive defects within a transparent semiconducting substrate, solution voltage imaging can in principle be realized by optical detection of local changes in the near-surface semiconductor space-charge layer. Changes to this space-charge layer are known to modulate the fluorescence of the defects by altering the number of electrons bound to each, otherwise known as the charge state of the defect [7][8][9] . Such a hybrid optoelectronic approach has been proposed 10 and would occupy a hitherto unexplored voltage imaging regime, combining the spatial resolution of optical techniques with the long-term stability and minimal invasiveness of MEAs.…”

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confidence: 99%

A diamond voltage imaging microscope

et al. 2022

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Technologies that capture the complex electrical dynamics occurring in biological systems, across fluid membranes and at solid-liquid interfaces drive fundamental understanding and innovation in diverse fields from neuroscience to energy storage. However, the capabilities of existing voltage imaging techniques utilizing micro-electrode arrays, scanning probes, or optical fluorescence methods are respectively limited by resolution, scan speed, and photostability. Here we develop an optoelectronic voltage imaging system which overcomes these limitations by using charge-sensitive fluorescent reporters embedded within a transparent semiconducting diamond device. Electrochemical tuning of the diamond surface termination enables photostable optical voltage imaging with a quantitative linear response at biologically relevant voltages and timescales. This technology represents a major step toward label-free, large-scale, and long-term voltage recording of physical and biological systems with sub-micron resolution.The development of fluorescent molecular sensors for imaging voltage changes in biological systems has revolutionized neuroscience, providing a tool to capture neuronal activity over large areas with sub-neuron resolution both in vitro and in vivo 1-3 . However, the poor photostability of

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confidence: 99%

A diamond voltage imaging microscope

et al. 2022

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“…[ 17–24 ] When designing a PEC‐PD, not only the photoelectric conversion of materials, but also the efficiency of interface chemical reaction should be taken into account. [ 25–29 ] Nanowire (NW) structure provides a larger area of solid‐liquid reaction interface, exhibiting natural advantages in PEC‐PDs. [ 30–36 ] As the cornerstone in the field of optoelectronics, nitride semiconductors demonstrate outstanding optoelectronic properties, wide bandgap and excellent chemical stability.…”

Section: Introductionmentioning

confidence: 99%

High‐Responsivity Natural‐Electrolyte Undersea Photoelectrochemical Photodetector with Self‐Powered Cu@GaN Nanowires Network

Chen

Lin

Qiu

et al. 2023

Adv Funct Materials

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Undersea optical communication (UOC) has been considered as the most potential next‐generation underwater wireless communication technology for ocean exploration. Photodetector is the essential component in UOC system, however, the harsh undersea environment like light attenuation and seawater corrosivity restricts the applications of conventional photodetectors. Herein, a novel natural‐electrolyte self‐powered photoelectrochemical (PEC) photodetector based on core‐shell structured Cu@GaN nanowires (NWs) network is demonstrated and direct utilization of seawater. High quality GaN shell is encapsulated on the Cu NWs network through Ga‐coating and high temperature nitridation processes. A Schottky junction along radial direction has formed at the Cu/GaN interface due to the outward diffusion of Cu into the GaN layer. Such a structure provides narrowed band detection on blue light as well as efficient carrier separation. A self‐powered undersea PEC photodetector is designed with a mini‐pipes connected device chamber, which allows direct indrawing of seawater and blue channel light communication (458 nm). This photodetector works stably for UOC in both shallow and deep‐sea conditions in Pacific Ocean area. It shows a high responsivity up to 5.04 mA W−1 and rapid response time of 0.68 ms. This photodetector can be easily integrated to marine equipment without waterproof packaging for the future energy‐saving UOC.

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“…Among these, fluorescence-based superresolution microscopy (f-SRM) techniques succeed in overcoming the resolution limits imposed by diffraction, reaching resolutions that range from 100 nm down to the subnanometer level 3 , 6 – 9 However, they still suffer from several significant drawbacks: (i) they require very specialized fluorescent probes, 10 , 11 (ii) some f-SRM techniques rely on laser beam exposure levels that can lead to phototoxicity and photodamage, 12 and (iii) unpredictable anomalous processes related to the distribution of f-SRM dyes in biological samples have been shown to exist 13 . Furthermore, due to the requirement of fluorescent labeling, their use is severely limited when it comes to resolving physicochemical properties of advanced nanomaterials or nanostructured devices that cannot be labeled.…”

Section: Introductionmentioning

confidence: 99%

Toward augmenting tip-enhanced nanoscopy with optically resolved scanning probe tips

et al. 2023

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A thorough understanding of biological species and emerging nanomaterials requires, among other efforts, their in-depth characterization through optical techniques capable of nanoresolution. Nanoscopy techniques based on tip-enhanced optical effects have gained tremendous interest over the past years, given their potential to obtain optical information with resolutions limited only by the size of a sharp probe interacting with focused light, irrespective of the illumination wavelength. Although their popularity and number of applications is rising, tip-enhanced nanoscopy (TEN) techniques still largely rely on probes that are not specifically developed for such applications, but for atomic force microscopy. This limits their potential in many regards, e.g., in terms of signal-to-noise ratio, attainable image quality, or extent of applications. We take the first steps toward next-generation TEN by demonstrating the fabrication and modeling of specialized TEN probes with known optical properties. The proposed framework is highly flexible and can be easily adjusted to be used with diverse TEN techniques, building on various concepts and phenomena, significantly augmenting their function. Probes with known optical properties could potentially enable faster and more accurate imaging via different routes, such as direct signal enhancement or facile and ultrafast optical signal modulation. We consider that the reported development can pave the way for a vast number of novel TEN imaging protocols and applications, given the many advantages that it offers.

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Color centers in wide-bandgap semiconductors for subdiffraction imaging: a review

Cited by 12 publications

References 163 publications

A diamond voltage imaging microscope

A diamond voltage imaging microscope

High‐Responsivity Natural‐Electrolyte Undersea Photoelectrochemical Photodetector with Self‐Powered Cu@GaN Nanowires Network

Toward augmenting tip-enhanced nanoscopy with optically resolved scanning probe tips

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