In summary, this grating structure can simultaneously increase the coupling coefficient κ and decrease the group index ng, which guarantees the broadband operation of the device.
In summary, this grating structure can simultaneously increase the coupling coefficient κ And reducing the group index ng ensures the broadband operation of the device.
To sum up, this grating structure can increase the coupling coefficient κ and decrease the group index ng at the same time, which ensures the broadband operation of the device.