Highly Sensitive Refractive Index Sensing Based on Photonic Spin Hall Effect and Its Application on Cancer Detection

Flexibly Enhanced Photonic Spin Hall Effect via Selective Brewster Angle

“…Due to the existence of the photonic spin Hall effect (SHE), when a linearly polarized light reflects or refracts at an interface between two media, the two opposite circularly polarized components will split in directions perpendicular to the incident plane. [1][2][3][4][5][6] For its ultra-high sensitivity on some physical parameters, such as refractive index, [7][8][9] optical phase, [10] and chiral magnitude, [11,12] the photonic SHE has attracted sustained attention and provided more opportunities in potential applications in different physical systems, like anisotropic crystals, [13,14] DOI: 10.1002/andp.202200515 semiconductors, [15][16][17] and metamaterials. [18][19][20][21] However, the photonic SHE is a relatively tiny phenomenon such that the spin shift is at subwavelength scale in general.…”

Giant photonic spin Hall effect induced by hyperbolic shear polaritons

“…The spin-dependent splitting in the PSHE is sensitive to the state of the incident photons and the physical parameters of the interface; thus, it holds great promise for various applications such as biosensing, optical differential manipulation, image processing, precision metrology, and so forth. [6][7][8][9][10] Unfortunately, the PSHE is typically very weak and the spin-dependent displacements are always at the subwavelength scale, severely inhibiting its practical applications. 11,12 Until now, even if many strategies including polarization control, 13 anisotropic impedance mismatching, 14 constructing surface plasmonic platform 15 and various metastructures [16][17][18] have been proposed to enhance the PSHE, the largest photonic spin Hall shifts achieved by these methods are only hundreds of times of the incident wavelength.…”

“…The spin-dependent splitting in the PSHE is sensitive to the state of the incident photons and the physical parameters of the interface; thus, it holds great promise for various applications such as biosensing, optical differential manipulation, image processing, precision metrology, and so forth. 6–10 Unfortunately, the PSHE is typically very weak and the spin-dependent displacements are always at the subwavelength scale, severely inhibiting its practical applications. 11,12…”

Nanophotonic Resonator Assisted Photonic Spin Hall Enhancement for Sensing Application

“…Here, the major emphasis is to enhance the PSHE, which has been investigated considering various nanophotonic techniques such as Brewster angle 19 , Surface Plasmon Resonance (SPR) [20][21][22] , optical pumping 23 and, lossy mode resonance (LMR) 24 , etc . These techniques have been utilized in designing highly sensitive refractive index sensors using PSHE 14,[24][25][26][27] . However, the reported PSHE-TD is very low in most reported structures, limiting its widespread use in various exciting applications.…”