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A technology of surface plasmons and excitons, applied in the field of optical waveguides, can solve problems such as large transmission loss, inability to realize long-distance optical signal transmission, and mode field limitation ability to restrict applications, so as to achieve the effect of reducing transmission loss
Inactive Publication Date: 2014-03-26
BEIHANG UNIV
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Among them, the dielectric / metal / dielectric optical waveguide has low transmission loss, but its poor mode field confinement ability restricts its application in high-integration optical circuits; on the other hand, the metal / dielectric / metal optical waveguide has strong Mode field limitation capability, but its transmission loss is too large, making it impossible to transmit long-distance optical signals
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example 1
[0032] Example 1: Outer vertex angle θ at the center of the metal base layer b Less than 180 degrees
[0033] figure 2 It is the structural diagram of the subwavelength surface plasmon optical waveguide described in Example 1. 201 is a metal base layer, and the outer vertex angle of its center is θ b , n m Its refractive index; 202 is the dielectric layer, and its minimum thickness is h; 203 is the metal cladding, and the inner vertex angle of the center is θ t , n m for its refractive index.
[0034] In this example, the wavelength of the transmitted optical signal is selected as 1.55 μm, the material of 201 and 203 is silver, and the refractive index at the wavelength of 1.55 μm is 0.1453+i*11.3587; the material of 202 is silicon dioxide, its refraction The rate is 1.5.
[0035] In this example, the outer vertex angle of the center of 201 is θ b =160 degrees; the inner vertex angle of the center of 203 is θ t =140 degrees; the value range of the thickness h is 20-1...
example 2
[0041] Example 2: The outer vertex angle θ of the center of the metal base layer b equal to 180 degrees
[0042] Figure 7 It is the structural diagram of the subwavelength surface plasmon optical waveguide described in Example 2. 701 is a metal base layer, and the outer vertex angle of its center is θ b , n m is its refractive index; 702 is the dielectric layer, and its minimum thickness is h; 703 is the metal cladding, and the inner vertex angle of the center is θ t , n m its refractive index.
[0043] In this example, the wavelength of the transmitted optical signal is selected as 1.55μm, the material of 701 and 703 is silver, and the refractive index at the wavelength of 1.55μm is 0.1453+i*11.3587; the material of 702 is silicon dioxide, which refracts The rate is 1.5.
[0044] In this example, the outer vertex angle of the center of 701 is θ b = 180 degrees; the inner vertex angle of the center of 703 is θ t =160 degrees; the value range of the thickness h is 10-...
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Abstract
The invention discloses a surface plasma polarization optical waveguide with stronger mode field constraint capacity and lower mode loss. The cross section of the waveguide structure comprises a metal base layer (1), a dielectric layer (2) arranged on the metal base layer and a metal covering (3) arranged on the dielectric layer. Strong coupling between the metal base layer and an adjacent metal covering can limit a light field into the dielectric layer between the metal base layer and the adjacent metal covering, and an outer vertex angle at the center of the metal base layer is larger than an inner vertex angle at the center of the metal covering, thus a transmission light field maintains mode field area of subwavelength and has lower transmission loss.
Description
technical field [0001] The invention relates to the field of optical waveguide technology, in particular to a subwavelength surface plasmon optical waveguide. Background technique [0002] As one of the emerging research fields of nanophotonics, surface plasmon optical waveguide technology has attracted extensive attention of experts and scholars at home and abroad in recent years. Surface plasmon is a non-radiative electromagnetic mode formed by the mutual coupling of free electrons and incident photons on the metal surface. It is a mixed excited state that propagates locally on the surface of the metal and the medium. This mode exists near the metal-dielectric interface, and its field strength reaches its maximum at the interface, and decays exponentially on both sides of the interface along the direction perpendicular to the interface. Surface plasmons have strong field confinement properties, which can confine the field energy to a region whose spatial size is much smal...
Claims
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