![]() ![]() High-performance, polarization-sensitive, long-wave infrared photodetection via photothermoelectric effect with asymmetric van der Waals contacts. Ultra-sensitive polarization-resolved black phosphorus homojunction photodetector defined by ferroelectric domains. Polarization-sensitive broadband photodetector using a black phosphorus vertical p–n junction. Broadband high photoresponse from pure monolayer graphene photodetector. Momentum-matching and band-alignment van der Waals heterostructures for high-efficiency infrared photodetection. Graphene charge-injection photodetectors. Unipolar barrier photodetectors based on van der Waals heterostructures. High-performance mid-IR to deep-UV van der Waals photodetectors capable of local spectroscopy at room temperature. Electrically tunable two-dimensional heterojunctions for miniaturized near-infrared spectrometers. Miniaturized spectrometers with a tunable van der Waals junction. A wavelength-scale black phosphorus spectrometer. Yuan, S., Naveh, D., Watanabe, K., Taniguchi, T. Dual-band infrared imaging using stacked colloidal quantum dot photodiodes. Mid-infrared polarization-controlled broadband achromatic metadevice. ![]() High-capacity free-space optical communications using wavelength- and mode-division-multiplexing in the mid-infrared region. Wavelength-multiplexed hook nanoantennas for machine learning enabled mid-infrared spectroscopy. Integrated near-infrared spectral sensing. Polarisation optics for biomedical and clinical applications: a review. Matrix Fourier optics enables a compact full-Stokes polarization camera. These demonstrations offer a promising approach for simultaneous detection of multidimensional optical information, indicating potential for diverse photonic applications. Moreover, the device exhibits an electrically tunable polarization photoresponse, enabling precise distinction of polarization angles under low-intensity light exposure. The device’s responsivity makes it possible to retrieve wavelength information, typically perceived as difficult to obtain. By using a bipolar and phase-offset polarization photoresponse, the device operated in the mid-infrared range can simultaneously detect both the polarization angle and incident intensity information through direct measurement of the photocurrents in the double twisted black arsenic–phosphorus homojunctions. Here we demonstrate a multidimensional optical information detection device based on zero-bias double twisted black arsenic–phosphorus homojunctions, where the photoresponse is dominated by the photothermoelectric effect. Simultaneous acquisition of this multidimensional information could provide comprehensive insights for understanding complex environments but remains a challenge. Vibrational circular dichroism, which uses light from the infrared energy region, is used for structural studies of small organic molecules, and most recently proteins and DNA.A light field carrying multidimensional optical information, including but not limited to polarization, intensity and wavelength, is essential for numerous applications such as environmental monitoring, thermal imaging, medical diagnosis and free-space communications. Near-infrared CD is used to investigate geometric and electronic structure by probing metal d→ d transitions. UV/Vis CD is used to investigate charge-transfer transitions. Most notably, UV CD is used to investigate the secondary structure of proteins. ![]() CD spectroscopy has a wide range of applications in many different fields. It is exhibited in the absorption bands of optically active chiral molecules. Circular dichroism and circular birefringence are manifestations of optical activity. This phenomenon was discovered by Jean-Baptiste Biot, Augustin Fresnel, and Aimé Cotton in the first half of the 19th century. Left-hand circular (LHC) and right-hand circular (RHC) polarized light represent two possible spin angular momentum states for a photon, and so circular dichroism is also referred to as dichroism for spin angular momentum. Dichroism with circularly polarized lightĬircular dichroism ( CD) is dichroism involving circularly polarized light, i.e., the differential absorption of left- and right-handed light. ![]()
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