Abstract:A high-sensitivity temperature sensor based on the enhanced Goos-Hänchen effect in a symmetrical metal-cladding waveguide is theoretically proposed and experimentally demonstrated. Owing to the high sensitivity of the ultrahigh-order modes, any minute variation of the refractive index and thickness in the guiding layer induced by the thermo-optic and thermal expansion effects will easily give rise to a dramatic change in the position of the reflected light. In our experiment, a series of Goos-Hänchen shifts ar… Show more
“…The sensitivity of SDDs at Brewster incidence can be further enhanced by enlarging the incident beam waist. This feature can be fully utilized in optical sensors as previously suggested 20–22 . However, high sensitivity may cause troubles in some cases because the displacements may be easily affected by both the environment and the quality of the optical elements (polarizer in particular).Figure 4The dependences of displacements Δ ± and sensitivities dΔ ± /d t of the RCP and LCP components of the reflected beam on the initial amplitude ratio t for different incident angles.…”
Optical spin splitting has a promising prospect in quantum information and precision metrology. Since it is typically small, many efforts have been devoted to its enhancement. However, the upper limit of optical spin splitting remains uninvestigated. Here, we investigate systematically the in-plane spin splitting of a Gaussian beam reflected from a glass-air interface and find that the spin splitting can be enhanced in three different incident angular ranges: around the Brewster angle, slightly smaller than and larger than the critical angle for total reflection. Within the first angular range, the reflected beam can undergo giant spin splitting but suffers from low energy reflectivity. In the second range, however, a large spin splitting and high energy reflectivity can be achieved simultaneously. The spin splitting becomes asymmetrical within the last angular range, and the displacement of one spin component can be up to half of incident beam waist w
0/2. Of all the incident angles, the spin splitting reaches its maximum at Brewster angle. This maximum splitting increases with the refractive index of the “glass” prism, eventually approaching an upper limit of w
0. These findings provide a deeper insight into the optical spin splitting phenomena and thereby facilitate the development of spin-based applications.
“…The sensitivity of SDDs at Brewster incidence can be further enhanced by enlarging the incident beam waist. This feature can be fully utilized in optical sensors as previously suggested 20–22 . However, high sensitivity may cause troubles in some cases because the displacements may be easily affected by both the environment and the quality of the optical elements (polarizer in particular).Figure 4The dependences of displacements Δ ± and sensitivities dΔ ± /d t of the RCP and LCP components of the reflected beam on the initial amplitude ratio t for different incident angles.…”
Optical spin splitting has a promising prospect in quantum information and precision metrology. Since it is typically small, many efforts have been devoted to its enhancement. However, the upper limit of optical spin splitting remains uninvestigated. Here, we investigate systematically the in-plane spin splitting of a Gaussian beam reflected from a glass-air interface and find that the spin splitting can be enhanced in three different incident angular ranges: around the Brewster angle, slightly smaller than and larger than the critical angle for total reflection. Within the first angular range, the reflected beam can undergo giant spin splitting but suffers from low energy reflectivity. In the second range, however, a large spin splitting and high energy reflectivity can be achieved simultaneously. The spin splitting becomes asymmetrical within the last angular range, and the displacement of one spin component can be up to half of incident beam waist w
0/2. Of all the incident angles, the spin splitting reaches its maximum at Brewster angle. This maximum splitting increases with the refractive index of the “glass” prism, eventually approaching an upper limit of w
0. These findings provide a deeper insight into the optical spin splitting phenomena and thereby facilitate the development of spin-based applications.
“…Since then, a lot of different schemes have been suggested by the researchers to study the GH shift [2][3][4][5][6][7][8][9]. Nowadays, the GH shift and its applications have attracted a lot of attentions in various fields of science, involving micro-and nanostructures [10], quantum and plasma physics [11], scientific research in graphene [12,13], sensors [14,15], and phase-conjugate mirrors [16]. The GH shift has also been applied in optical sensing, for example, measuring refractive index, beam angle, irregularities, and roughness on the surface of dispersive medium [7,17] using the tunable GH with a fix configuration.…”
Influence of PT symmetry on the Goos-Hänchen (GH) shift in the reflected light is presented for an ensemble of atomic medium in a cavity, in the configuration of four-level N -type ( 87 Rb atoms) systems driving by two copropagating strong laser fields and a weak probe field. The atom-field interaction follows the realization of PT symmetry by adjusting the coupling field detunings [J. Shenget al., Phys. Rev. A 88, 041803(R) (2013)]. A giant enhancement for the GH shift in the reflected light is revealed when the PT -symmetry condition is satisfied.
“…A lot of attention has been motivated due to its potential applications in different fields of science, i.e. in micro and nanostructures [10], quantum and plasma physics [11], scientific research in graphene [12,13], sensors [14,15], and phase-conjugate mirror [16]. The GH shift has also potential applications in optical sensing, for example, measuring the refractive index, beam angle, probing irregularities, and roughness on the surface of a dispersive medium [7,17].…”
The influence of spontaneous generated coherence (SGC) on the Goos-Hänchen (GH) shift in the reflected light is presented. A weak probe light is incident on a cavity containing three-level gaseous atomic medium consist of 85 Rb atoms. The atom-field interaction follows electromagnetically induced transparency configuration, and the SGC modifies the dispersion and absorption properties of a system [Y. Niu and S. Gong, Phys. Rev. A 73, 053811 (2006)]. The SGC enhances the Kerr nonlinearity which leads to giant negative and positive GH shifts in the reflected light. Further, the control of negative and positive GH shifts is achieved via manipulation of probe field detuning.
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