Simple Unbiased Hot-Electron Polarization-Sensitive Near-Infrared Photodetector

Mirzaee, Somayeh M. A.; Lebel, Olivier; Nunzi, Jean‐Michel

doi:10.1021/acsami.7b17836

Cited by 20 publications

(13 citation statements)

References 66 publications

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“…[30] This approach is advantageous for achieving a wide range of sensing wavelengths, even in the NIR range, by simply controlling the shape, size, and arrangement of asymmetric nanostructured arrays. [31,32] However, highly sophisticated and often expensive processes (i.e., nanoscale photolithography) are required to fabricate strongly photoactive chiro-metasurfaces. Moreover, the photoresponsivity of such hot-electron devices is potentially limited by the energy-barrier height at the metal-semiconductor Schottky interfaces.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Circularly Polarized Light‐Sensing Near‐Infrared Organic Phototransistors for Optoelectronic Cryptographic Primitives

Han

Lee

Kyhm

et al. 2020

Adv Funct Materials

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Chiral photonics has emerged as a key technology for future optoelectronics, such as quantum information and encryption, by making use of photonic waves from enantiomeric structures. An inevitable challenge for realizing such chiral optoelectronics is the development of near-infrared circularly polarized (NIR CP) light-sensing photodetectors that convert optical power and circular polarization direction into distinguishable electrical signals. Herein, a simple and promising strategy for high-performance NIR CP light-sensing organic phototransistors (NIR CPL-OPTRs) applicable to highly secure optoelectronic encryption is proposed. By directly assembling a standalone cholesteric liquid-crystal network film in a thin-film NIR CPL-OPTR, remarkable responsivity and distinguishability are achieved. The synergetic effect of amplification of the photocurrent signal by the applied electric field and improved light absorption by the reduced reflection in the multilayered structure leads to high responsivity. As a proof-of-concept, the chiral phototransistor arrays are demonstrated as a physically unclonable function device and exhibit enhanced cryptographic characteristics.

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Section: Introductionmentioning

confidence: 99%

High‐Performance Circularly Polarized Light‐Sensing Near‐Infrared Organic Phototransistors for Optoelectronic Cryptographic Primitives

Han

Lee

Kyhm

et al. 2020

Adv Funct Materials

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“…4(a) and 4(b), respectively. The broadened absorption spectrum covering the near-infrared (NIR) region plus the SEM image confirm that the rough thin film consists of randomly placed isolated Au nanoislands with strong interparticle interaction between neighboring particles [50,51]. A capacitor device built from the gold sample in the same configuration represented in Fig.…”

Section: Induced Photovoltage Via the Optical Rectification Procesmentioning

confidence: 74%

Searching for evidence of optical rectification: optically induced nonlinear photovoltage in a capacitor configuration

Mirzaee¹,

Nunzi²

2018

J. Opt. Soc. Am. B

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A current challenge in photonics is to design new versatile photodetectors based on optical rectification induced photo-voltage; these ones are more attractive than classical photodetectors because they do not rely on band to band transitions. Identification of the origin of the photovoltage detected under intense illumination can sometimes be confusing due to the competition between several nonlinear processes. Examples of such processes are optical rectification, multiphoton absorption, and photothermal heating, all of which may result in the detection of a DC photovoltage in a capacitor configuration. Herein, differences between the resulting photovoltage from these processes are analyzed, and techniques are proposed to distinguish between optical rectification-induced DCphotovoltage and the photovoltage resulting from alternative effects.

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“…[ 1–7 ] These electrons can be transferred into the electronic states of molecules close to the surface of the plasmonic nanostructures, and thus induce chemical reactions which would otherwise be energetically demanding. [ 8–10 ] They can also be injected into the conduction band of a semiconductor for use in photovoltaics, [ 11–13 ] photodetectors, [ 14,15 ] and photoelectrochemical systems. [ 13,16 ]…”

Section: Introductionmentioning

confidence: 99%

Disentangling the Temporal Dynamics of Nonthermal Electrons in Photoexcited Gold Nanostructures

O’Keeffe

Catone

Mario

et al. 2021

Laser & Photonics Reviews

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The study of nonthermal electrons, generated upon photoexcitation of plasmonic nanostructures, plays a key role in a variety of contexts, from photocatalysis and energy conversion to photodetection and nonlinear optics. Their ultrafast relaxation and subsequent release of energy to a low energy distribution of thermalized hot electrons has been the subject of a myriad of papers, mostly based on femtosecond transient absorption spectroscopy (FTAS). However, the FTAS signal stems from a complex interplay of different contributions arising from both nonthermal and thermal electrons, making the disentanglement of the two a very challenging task, so far accomplished only in terms of numerical simulations. Here a combined approach is introduced, based on a post-processing of the FTAS measurements guided by a reduced semiclassical model, the so-called extended two-temperature model, which has allowed the purely nonthermal contribution to the pump-probe experimental map recorded for 2D arrays of gold nanoellipsoids to be isolated. This approach displays the intimate correlation between electron energy and probe photon energy on the ultrafast time-scale of electron thermalization. It also sheds new light on the ultrafast transient optical response of gold nanostructures, and will help the development of optimized plasmonic configurations for nonthermal electrons generation and harvesting.

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Simple Unbiased Hot-Electron Polarization-Sensitive Near-Infrared Photodetector

Cited by 20 publications

References 66 publications

High‐Performance Circularly Polarized Light‐Sensing Near‐Infrared Organic Phototransistors for Optoelectronic Cryptographic Primitives

High‐Performance Circularly Polarized Light‐Sensing Near‐Infrared Organic Phototransistors for Optoelectronic Cryptographic Primitives

Searching for evidence of optical rectification: optically induced nonlinear photovoltage in a capacitor configuration

Disentangling the Temporal Dynamics of Nonthermal Electrons in Photoexcited Gold Nanostructures

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