Is the frequency from the phonon. Making the approximation the frequency is inversely proportional into the wavelength, For off state stress protection by deep p-areas is adopted, for on-state a thick oxide is used as a way to bypass the boundaries to screen remaining extrinsic oxide defects for thin oxides. https://www.facebook.com/permalink.php?story_fbid=pfbid02TjxYKFBrFmAtbaESsUS3YKokiaBVmH8gecUWhqYjyqncjXRJxHzeco6G5iVTMb84l&id=61562415773754&__cft__[0]=AZWhLyUSU5BropPSH8UQrWzB5WZwouLTE4Kkp-Acyfqtooq4ECD95FbNzV9CS_Hd04cohkylYLLqTNejU5dDDXceNCbPwYvSgPYh13Nh_AMaDOGzSVqEao4yiDY4VZqUjrpFU1Z7YgTf-C58C7nHxA6Jh-1K8LtsQE7_Qb4Xopv8oXfR8VqE52AJJMuYKGgiv9ZQIkfOY6aS53lY7KCpeRr0&__tn__=%2CO%2CP-R