We discovered that the grating thickness could raise the ratio of TM over TE mode, because the TE mode decayed faster than TM mode.But it is a trade off that the total responsivity was decreased.

• 我们发现增加光栅厚度可以TM模态响应减少较快，增加TM除以TE模态响应的比例，但整体来说也会减少响应。